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Programme and Abstract Book International e-Conference on Plasma Theory and Simulations (PTS – 2020) 14 & 15 September, 2020 Department of Pure & Applied Physics Bilaspur (C.G.), INDIA Guru Ghasidas Central University, Bilaspur (India)

PTS-2020 International e-Conference on Plasma Theory and Simulations 14 & 15 September, 2020 Abstract Book Compiled & Edited by Dr. R. P. Prajapati Bivash Dolai Organized by Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (India)

© Guru Ghasidas Central University, Bilaspur, Chhattisgarh, India International e-Conference on Plasma Theory and Simulations September, 2020 All rights reserved. This publication or any part of it may not be transmitted or reproduced in any form, mechanical or electronic, recording, including photocopy without written permission from the copyright authority. Disclaimer The publisher and editors are not responsible for any results, methods, claims contained in the abstracts. The authors are responsible for the contents of the abstracts included in this abstract book.

Foreword The International e-Conference on Plasma Theory and Simulations (PTS 2020) is organized by Department of Pure & Applied Physics, Guru Ghasidas Central University, Bilaspur (C.G.) (India) during 14 & 15, September 2020. The aim of this conference is to interact and discuss on the recent advancements in the emerging fields of theoretical and simulation plasma research. Nowadays, theoretical and simulation researches in various subfields of plasma physics are going on owing to great relevance in laboratory and astrophysical plasmas. The plasma physics is an interdisciplinary research field which covers diverse subjects viz. nuclear fusion, low temperature plasma, fluid dynamics, laser plasma, semiconductor plasma, industrial plasma, material science, space physics, astrophysics and chemistry too. In the present era owing to global energy crisis, the research in fusion energy has been emerged with great interest. The International Thermonuclear Experimental Reactor (ITER) and Tokamak are fusion reactors in which many researchers have carried out theoretical, experimental and simulation studies. The hope of successful controlled fusion in ITER named as “artificial sun on earth” gives opportunity to young researchers for continuously working. During this COVID-19 pandemic, let us take opportunity to discuss and interact on various advanced issues related to theoretical and simulation research in plasma physics. The PTS-2020 is planned to be conducted online through Zoom Cloud Meeting. The conference covers diverse research areas of theoretical and simulations results such as Basic Plasma Phenomena, Dusty (complex) Plasma, Quantum Plasma, Laser Plasma Interactions, Nonlinear interactions, Magnetic Fusion Plasma, Space and Astrophysical Plasma and MHD and Fluid Dynamics. In the conference we have received total 352 registration of the participants. There is one keynote address, 13 Invited Talks and 13 Oral Presentations. Also, nearly 80 abstracts have been received for poster presentations from participants across the country. On behalf of the Department of Pure and Applied Physics, GGV, Bilaspur (India), I would like to welcome all the speakers and participants for joining and making PTS-2020 a successful and productive conference. R. P. Prajapati (Convener, PTS-2020)

International Advisory Committee Avinash Khare (IN) Michel Bonitz (DE) F Haas (BR) R Ganesh (IN) S A Khrapak (DE) R K Chhajlani (IN) G Hoshoudy (EG) B P Pandey (AU) N P S Saini (IN) J Parashar (IN) S Dubey (IN) P K Sharma (IN) Prerana Sharma (IN) Prof. Anjila Gupta (Patron) Prof. P. K. Bajpai (Chair Person) Dr. R. P. Prajapati (Convener) Local Organizing Committee G K Patra (Dean) H S Tewari M N Tripathi Parijat Thakur J Singh R P Patel A K Singh R K Pandey M P Sharma T G Reddy P Das P Rambabu T Trivedi S P Patel D Uthra V Kumar S Tigga A Singh Technical Committee Bivash Dolai S Kaothekar S Argal A Bhargava

PTS- 2020 Conference Schedule Day-1: 14.09.2020 (Monday) Time Inaugural Session (10.30-11.40 AM) Speaker 10.30 AM Guests, Speakers & Participants joining to Zoom Cloud Meeting Welcome address and brief about PTS-2020 by Dr. R. P. Prajapati Convener PTS-2020 10.40 AM - Speech by Chairperson PTS-2020 and HOD, Pure & Prof. P. K. Bajpai 11:00 AM Applied Physics Speech by Dean, School of Physical Sciences Prof. G. K. Patra Speech by Hon’ble Vice Chancellor and Patron PTS- Prof. Anjila Gupta 11.00 AM - 2020 Prof. Avinash Khare, Hon’ble 11.40 AM Vice Chancellor Sikkim Keynote Address followed by Talk entitled “Critical Phenomenon and thermodynamics of Central University, Sikkim gravitating dusty clouds” Session-1 (11.45 AM-02.00 PM) (Session Chair: R. Shrivastava, IIT Roorkee) Time Talk No. Speaker Affiliation Title of the talk 11.45 AM- IT-01 R. Ganesh Institute for Plasma Can Rayleigh-Benard convection cells 12.15 PM Research Gandhinagar, be “peeled off” by a particle level Gujarat, India fluctuation? 12.20 PM – IT-02 Rony Centre for Mathematical A fresh look at waves in ion-electron 12.50 PM Keppens Plasma Astrophysics, plasmas: reformulating the textbook Belgium Time KU Leuven, Belgium treatments S. Khrapak Institute for Materials Collective excitations in strongly and 08.50 AM 12.55 PM – IT-03 01.25 PM Physics in Space moderately coupled complex plasmas GermanyTime German Aerospace 09.25 AM Center (DLR), Germany 01.30 PM – 01.45 PM ORAL-1 K. Makwana Indian Institute of Properties of magnetohydrodynamic 01.45 PM – Technology, Hyderabad, modes in compressively driven plasma India turbulence ORAL-2 M. K. Shukla Jawaharlal Nehru Thermodynamics of Yukawa gas: 02.00 PM College, Pasighat, A.P. Simulation and Application India LUNCH BREAK International e-Conference on Plasma Theory and Simulations (PTS-2020), 14 & 15 September 2020 Department of Pure & Applied Physics, Guru Ghasidas Central University, Bilaspur (India)

Day-1: 14.09.2020 (Monday) Session-2 (03.00 PM -05.45 PM) (Session Chair: Punit Kumar, Lucknow University) Time Talk No. Speaker Affiliation Title of the talk 03.00 PM- IT-04 M. Bonitz Institut für Theo. Phys. Perspectives of quantum plasma and 03.30 PM und Astrophy. Christian warm dense matter theory GermanyTime R. K. -Albrechts-Universität 11.30 AM Kiel, Germany Retired from Vikram Instabilities in plasma and dense 03.35 PM – IT-05 04.05 PM Chhajlani University Ujjain, M.P., plasma 04.10 PM – IT-06 N. P. S. India Neutrino-driven instability of ion Guru Nanak Dev 04.40 PM Saini University, Amritsar, acoustic waves in a degenerate plasma Punjab, India New type of Jeans instability and 04.45 PM – ORAL-3 Ch. Rozina Lahore College for 05.00 PM Women University, nonlinear Landau damping of Pak Time Pakistan circularly polarized EMWS 04.15 PM Center of Excellence in Wave breaking amplitude of EASWs 05.00 PM – ORAL-4 Arghya 05.15 PM Mukherjee Space Sciences, IISER in an unmagnetised plasma with 05.15 PM – ORAL-5 Pankaj Kolkata, W.B., India Kappa-distributed electrons Tezpur University, Nonlinear Structure Formation in 05.30 PM Sarma Assam, India Nonideal Protoplanetary Disks Oak Ridge National A 3+ 1 moment gyro-fluid model to 05:30 PM – ORAL-6 Yashika 05:45 PM Ghai Laboratory, USA study energetic particles instabilities TN USA Time in fusion plasma 07.00 AM International e-Conference on Plasma Theory and Simulations (PTS-2020), 14 & 15 September 2020 Department of Pure & Applied Physics, Guru Ghasidas Central University, Bilaspur (India)

Day-2: 15.09.2020 (Tuesday) Session-3 (10.30 AM-01.30 PM) (Session Chair: M. Bose, Jadavpur University) Time Talk No. Speaker Affiliation Title of the talk 10.30 AM- IT-07 Birendra Macquarie University, Exoplanet migration in magnetized discs 11.00 AM Pandey Sydney, Australia AustraliaTime P. Bando- Institute for Plasma Experiments in DC Coulomb crystals 03.00 PM 11.05 AM – IT-08 11.35 AM padhyaya Research Gandhinagar, 11.40 AM – IT-09 Gujarat, India A.P. Misra Vishva Bharati Univ. Landau damping due to multi- 12.10 PM Shantiniketan, W.B., plasmon resonances in a degenerate India plasma: A new nonlocal KdV equation 12.15 PM – ORAL-7 R. Kakoti North Eastern Regional Study of the formation of rogue waves 12.30 PM Institute of Science and in an adiabatic electronegative plasma Technology, A.P., India 12.30 PM – ORAL-8 N. A. El- CSRA, Damietta Three-dimensional Rogue Waves in 12.45 PM Shafeay University, Egypt D-F Regions of Earth's Ionosphere Egypt Time ORAL-9 S. Basnet with Hybrid-Cairns-Tsallis- 09.00 AM distributed Electrons and Positrons Tribhuvan University, Collisional two ion species plasma 12.45 PM – 01.00 PM Kathmandu, Nepal with Bi-Maxwellian electrons and Nepal Time Indian Institute of Bohm condition Study of electron-impact fine- 01.00 PM 01.00 PM – ORAL-10 Shivam 01.15 PM Gupta Technology Roorkee, structure excitation of Kr+ Ion 01.15 PM – Uttrakhand, India Poster Discussions Session: (Chair- P. K. Sharma, BUIT, Bhopal) 01.30 PM All poster presenter will be available online to answer the questions raised by speakers and participants on the particular poster displayed on conference website. LUNCH BREAK International e-Conference on Plasma Theory and Simulations (PTS-2020), 14 & 15 September 2020 Department of Pure & Applied Physics, Guru Ghasidas Central University, Bilaspur (India)

Day-2: 15.09.2020 (Tuesday) Session-4 (02.30 PM-05.30 PM) (Session Chair: R. Khanal, Tribhuvan University, Nepal) Time Talk No. Speaker Affiliation Title of the talk 02.30 PM- IT-10 S. K. Tiwari Indian Institute of Nonlinear mixing of oscillations in 03.00 PM Technology, Jammu, dusty plasma 03.05 PM – IT-11 India Modeling X-ray free electron laser V. Saxena Indian Institute of 03.35 PM Technology Delhi, irradiated matter 03.40 PM – IT-12 India Nonlinear interaction of ultra-intense G. Purohit DAV (PG) College 04.10 PM Dehradun, India laser pulse with plasma 04.15 PM – IT-13 S. Dubey Vikram University Transient nonlinear interactions in 04.45 PM Ujjain, India semiconductor plasmas 04.45 PM – ORAL-11 Shikha Manipal University Gaussian laser pulse driven Terahertz 05.00 PM Sharma Jaipur, Jaipur, India radiation in the plasma 05.00 PM – ORAL-12 Nidhi Guru Nanak Dev Self-focusing of non-gaussian laser 05.15 PM Pathak University, Amritsar, beam in an inhomogeneous plasma India with density variation 05.15 PM – Closing Remarks & Feedback 05.30 PM Note: A feedback link will be circulated to the participants. After submission of feedback participation certificates will be provided. Time Allotted:  Invited Talk: 30 Minutes (25 Minutes presentation + 05 Minutes Discussions)  Contributory Oral Talk: 15 Minutes (12 Minutes presentation + 03 Minutes Discussions) International e-Conference on Plasma Theory and Simulations (PTS-2020), 14 & 15 September 2020 Department of Pure & Applied Physics, Guru Ghasidas Central University, Bilaspur (India)

Prof. Anjila Gupta Vice-Chancellor Guru Ghasidas Vishwavidyalaya Bilaspur (C.G.) 495009 India e-mail: [email protected] Phone: 07752-260283, 260481 Fax 0775-260148 MESSAGE I am glad to know that Department of Pure and Applied Physics, Guru Ghasidas Vishwavidyalaya, Bilaspur is going to organize Two days International e-Conference on Plasma Theory and Simulations (PTS-2020) from 14-15, September 2020. It gives me immense pleasure to know that many excellent talks are scheduled from experts belonging to premier institutes and universities of India, USA, Germany, Belgium, Egypt, Iran, Nepal and Pakistan. I would like to welcome all the speakers and participants to join this conference and to know more about the university. I invite you all to visit the glory and greenery of the university campus when the situation becomes normal after Covid-19 pandemic. The plasma research is the need of current situation of global energy crisis. The controlled nuclear fusion may produce unlimited clean energy on which scientists are working since last few decades. It is also a matter of proud for all of us that India is a member country in the group of seven countries including USA, Japan, Russia, South Korea, China and EU to establish the International Thermonuclear Experimental Reactor (ITER) so called “artificial sun of the earth” at France. The plasma physics is an interdisciplinary research field and has several natural and laboratory applications. Finally, I congratulate the organizers of PTS-2020, for their tireless efforts to enable large international participation and arranging excellent talks in different research areas of plasma Physics. With Best Wishes Prof. Anjila Gupta

General Incorporated Association Division of Plasma Physics Association of Asia Pacific Physical Societies Date: 08-09-2020 E-mail: [email protected] MESSAGE The plasma physics is an interdisciplinary research field and very common to understand the various phenomena of the cosmologies, the astrophysics, the solar physics, the space physics, the earth dynamo, the accelerator physics, the high intensity laser plasma science, magnetic and inertial confinement fusion plasma. Nowadays, the plasma based technology are widely used for engineering applications such as plasma processing, plasma medicine, plasma propulsion. Being the Chairman of AAPPS-DPP, I had an opportunity to know the advanced research carried out by the members of DPP. Many researchers are enthusiastically working in the field of theory and simulations in plasmas. I am glad to know that Department of Pure & Applied Physics, Guru Ghasidas Central University, Bilaspur (India) is going to organize two days International e-Conference on Plasma Theory and Simulations (PTS 2020) on 14 & 15 September 2020. The conference covers diverse research areas of theoretical and simulations results such as Basic Plasma Phenomena, Dusty (complex) Plasma, Quantum Plasma, Laser Plasma Interactions, Nonlinear interactions, Magnetic Fusion Plasma, Space and Astrophysical Plasma and MHD and Fluid Dynamics. Many excellent talks of eminent plasma physicists have been scheduled and many young researchers have been given chance to present their work as oral presentation. I hope that PTS-2020 will provide an opportunity to interact participants and speakers virtually in this Covid-19 pandemic period and come out with new challenges and outcomes to solve the issues of theoretical and simulations research. I appreciate the hard work done by the organizers of the conference and wish them for grand success of this conference. Best wishes Signature Mitsuru Kikuchi Chairman, Division of Plasma Physics, AAPPS

MESSAGE I am happy to know that the Department of Pure & Applied Physics, Guru Ghasidas Central University, Bilaspur (India) is going to organize two days International e-Conference on Plasma Theory and Simulations (PTS 2020) on 14 & 15 September 2020 through online mode. The conference has special significance since it focuses on diverse research areas of theoretical and simulations results such as Basic Plasma Phenomena, Dusty Plasma, Quantum Plasma, Laser Plasma Interactions, Nonlinear interactions, Magnetic Fusion Plasma, Space and Astrophysical Plasma and MHD and Fluid Dynamics. This conference is also to interact and discuss on the recent advancements in the emerging fields of theoretical and simulation plasma research. I would hope that participation in this conference would motivate young researchers from different branches of science and engineering to enter these challenging fields. Lastly, on behalf of PSSI, I thank the organizers for their sincere efforts for organizing this conference. I extend my best wishes to all the participants and hope that the Symposium will achieve its desired objectives. Dr. P. K. Atrey Dean (R&D), IPR & President, PSSI

Contents S. Talk No. Title of paper and authors Page No. No. 1. Keynote Critical Phenomenon and thermodynamics of gravitating dusty 10 Address clouds Avinash Khare Invited Talks 2. IT-01 Can Rayleigh-Benard Convection Cells be “peeled off” by a particle 11 level fluctuation? Pawandeep Kaur, Rajaraman Ganesh 3. IT-02 A fresh look at waves in ion-electron plasmas: reformulating the 12 textbook treatments Rony Keppens 4. IT-03 Collective excitations in strongly and moderately coupled complex 13 plasmas S. Khrapak 5. IT-04 Perspectives of quantum plasma and warm dense matter theory 14 M. Bonitz, Zh. Moldabekov, T. Dornheim, P. Hamann, and J. Vorberger 6. IT-05 Instabilities in Plasma and Dense Plasma 15 7. IT-06 R. K. Chhajlani and R. P. Prajapati 8. IT-07 Neutrino-driven instability of ion acoustic waves in a degenerate 16 plasma N. P. S. Saini, Y. Ghai and B. Eliasson Exoplanet migration in magnetized discs 17 Birendra Pandey 9. IT-08 Experiments in DC coulomb crystals 18 Pintu Bandyopadhyay, M. G. Hariprasad, A. Saravanan, Garima Arora and Abhijit Sen 10. IT-09 Landau damping due to multi-plasmon resonances in a degenerate 19 plasma: A new nonlocal Korteweg-de Vries equation D. Chatterjee, A. P. Misra, G. Brodin 1

S. No. Talk No. Title of paper and authors Page No. 11. IT-10 Nonlinear mixing of oscillations in dusty plasma 20 Ajaz A Mir, Sanat K Tiwari, John Goree, Abhijit Sen, Chris Crabtree and Gurudas Ganguly 12. IT-11 Modeling X-ray free electron laser irradiated matter 21 V. Saxena, Z. Jurek, S.-K. Son, B. Ziaja and R. Santra 13. IT-12 Nonlinear Interaction of Ultra-intense Laser Pulse with Plasma 22 Gunjan Purohit 14. IT-13 Transient nonlinear interactions in semiconductor plasmas 23 S. Dubey Contributory Oral Talks 15. Oral-01 Properties of Magnetohydrodynamic Modes in Compressively 24 Driven Plasma Turbulence K. Makwana and H. Yan 16. Oral-02 Thermodynamics of Yukawa Gas: Simulation and Application 25 Manish K. Shukla and K. Avinash 17. Oral-03 New type of Jeans instability and Nonlinear Landau damping of 26 circularly polarized EMWS Ch. Rozina and N. L. Tsintsadze 18. Oral-04 Wave breaking amplitude of Electron Acoustic Solitary Waves in 27 an unmagnetised plasma with Kappa-distributed electrons Arghya Mukherjee 19. Oral-05 Nonlinear Structure Formation in Non-ideal Protoplanetary Disks 28 Pankaj Sarma and P. K. Karmakar 20. Oral-06 A 3+1 moment gyro-fluid model to study energetic particles 29 instabilities in fusion plasma Y. Ghai, D. A. Spong, J. Varela, L. Garcia 21. Oral-07 Study of the Formation of Rogue Waves in an Adiabatic 30 Electronegative Plasma Rajkamal Kakoti and K. Saharia 22. Oral-08 Three-dimensional Rogue Waves in D-F Regions of Earth's Ionosphere 31 with Hybrid-Cairns-Tsallis-distributed Electrons and Positrons S. K. El-Labany, W. F. El-Taibany, N. A. El-Bedwehy and N. A. El- Shafeay 2

S. No. Talk No. Title of paper and authors Page No. 23. Oral-09 Collisional two ion species plasma with Bi-Maxwellian electrons and 32 Bohm condition S. Basnet and R. Khanal 24. Oral-10 Study of Electron-Impact Fine-Structure Excitation of Kr+ Ion 33 Shivam Gupta and Rajesh Srivastava 25. Oral-11 Gaussian laser pulse driven Terahertz radiation in the plasma 34 Shikha Sharma and Reenu Gill 26. Oral-12 Self-Focusing of Non-Gaussian Laser Beam in an Inhomogeneous 35 Plasma with Density Variation Nidhi Pathak, T.S Gill and Sukhdeep Kaur 27. Oral-13 Theoretical Study of the Energy and Luminosity of an Ion Beam 36 Accelerated in the Radiation Pressure Dominated (RPD) Region Shalu Jain, Krishna Kumar Soni, N. K. Jaiman and K. P. Maheshwari Poster Presentations Basic Plasma Phenomena 28. BP-01 Numerical Studies of Dissipative Instabilities in Hall Thruster 37 Plasma Sukhmander Singh 29. BP-02 Head-on and Overtaking Collision of Kinetic Alfven Solitons 38 Shahida Parveen 30. BP-03 Molecular cloud Formation Via Thermal Instability of Viscous 39 Partially-Ionized Plasma with Neutral Collision and Radiative Heat-loss Function in Interstellar Media S. Kaothekar 31. BP-04 Effect of mechanical, barrier and adhesion properties on oxygen 40 plasma surface modified polypropylene Vishnuvarthanan M 32. BP-05 Energy generation using nuclear fusion: A study 41 Alok Kumar Chaudhary 33. BP-06 Exchange of wave energy among two orthogonally propagating 42 waves through wave-particle interaction in a magnetised plasma Banashree Saikia and P. N. Deka 34. BP-07 Effect of Dust Concentration on the Characteristics of Rogue Waves 43 in a Dusty Plasma with Maxwellian Negative Ions Rajkamal Kakoti and K. Saharia 3

S. No. Talk No. Title of paper and authors Page No. 35. BP-08 FLR effect on the Rayleigh-Taylor Instability in Strongly coupled 44 Rotating Magnetized Viscoelastic Fluids P. K. Sharma, Nusrat khan, Shraddha Argal and Anita Tiwari 36. BP-09 Terahertz Radiation Propagation through Double Layered Metallic 45 Plasmonic Waveguide R. Kaur, S. Kaur and G. Kumar 37. BP-10 Linear dispersion characteristics and shock fronts of EAW in semi 46 classical plasma Mrittika ghosh, Debiprosad Dutta and Swarniv Chandra 38. BP-11 Non-thermal plasma technology for the improvement of hydrogel 47 surface towards Biomedical Applications P. Panda, R. Mahanta, S. P. Das 39. BP-12 Plasma is need of an hour 48 Ramlal, Akhilesh Singh Rajput and A. K. Shrivastava 40. BP-13 A collisional radiative model for the diagnostics of Ar-CO2 mixture 49 plasma Neelam Shukla, R K Gangwar and R Srivastava 41. BP-14 Small amplitude ion-acoustic soliton in unmagnetized plasmas with 50 superthermal electrons and negative ions J. K. Chawla 42. BP-15 Role of localized structures and associated turbulence generation at 51 magnetopause reconnection sites Neha Pathak, R. P. Sharma and S. C. Sharma 43. BP-16 Azimuthal Drift of Magnetized Electrons in a Hall Thruster Dusty 52 Plasma Jasvendra Tyagi 44. BP-17 Large amplitude ion-acoustic solitons in plasmas with positrons and 53 nonthermal electrons S. K. Jain 45. BP-18 Collisional radiative model for laser induced Mg plasma using 54 calculated detailed electron excitation cross-sections and self- absorption correction S. S. Baghel, S. Gupta, R. K. Gangwar and R. Srivastava 46. BP-19 Surface modification of chitosan/starch bio-composites by non- 55 thermal Ar, Ar+O2 and He+O2 Plasma treatment: a comparative study and towards biomedical applications. Rajesh K. Mahanta, Pranita Panda and Smrutiprava Das 4

S. No. Talk No. Title of paper and authors Page No. 47. BP-20 Study of the Low Latitude Plasma Bubbles Irregularities 56 Climatology using SWARM Satellite A. Shaker, Ayman Mahrous, Ibrahim Fathy 48. BP-21 Electron acoustic solitary waves in Fermi plasma with two- 57 temperature electrons S. Pramanick, A. Dey, S. Chakraborty, M. Sarkar, S. Chandra 49. BP-22 Coupled KP Equation in Non-Maxwellian Plasmas with two 58 Temperature Electrons Manveet Kaur and N. S. Saini 50. BP-23 Gravitational instability in Viscoelastic medium with non-uniform 59 rotation and magnetic field under dissipative energy effects Joginder Singh Dhiman and Mehak Mahajan 51. BP-24 Study of floating potential oscillations of anodic double layers 60 produced in a typical dc glow discharge plasma Thangjam Rishikanta Singh and Suraj Kumar Sinha 52. BP-25 Head-on Collision of Electron Acoustic Solitary Waves in a Plasma 61 with Generalized (r, q) Distribution Rupinder Kaur and N. S. Saini Dusty (Complex) Plasmas 53. DP-01 Collective excitation of dust grains in 3D complex plasma 62 P. Bezbaruah and N. Das 54. DP-02 Evolution of Dusty Plasma: From Challenges to Opportunities 63 Avik Kr. Basu and M. Bose 55. DP-03 Instabilities in Magnetized Inhomogeneous Plasmas with The Effect 64 of Recombination Shachi Pachauri, Kamakhya Prakash Misra and Jyoti 56. DP-04 Dynamics of dust ion acoustic waves in the Low Earth Orbital 65 (LEO) plasma region Siba Prasad Acharya, Abhik Mukherjee and M. S. Janaki 57. DP-05 Charging of dust particles in plasma using h-PIC-MCC simulation 66 model Suniti Changmai and Madhurjya P. Bora 58. DP-06 Nonlinear Propagation of Dust Acoustic Waves in Dusty Plasma 67 having Nonisothermal Two-Temperature Electrons and Isothermal Positrons S. Chattopadhyay, S. N. Paul and S. K. Bhattacharya 5

S. No. Talk No. Title of paper and authors Page No. 59. DP-07 Effect of Multiply Charged Xe Ions on a Dusty Hall Discharge 68 Plasma Jasvendra Tyagi 60. DP-08 Molecular Dynamics Simulation of the Kelvin-Helmholtz Instability 69 in Dusty Plasma Layers with Different Velocities and Density Bivash Dolai and R. P. Prajapati Laser Plasma Interactions 61. LP-01 Controlled Tunable Resonant Phase Matching in Laser Plasma 70 Interaction 71 S. Divya 62. LP-02 Nonlinear theory of a Cherenkov free-electron laser Hesham Fares and Mohamed Mahmoud 63. LP-03 Magnetic Field Generation by Laser-Pulse Interaction with Plasmas 72 Krishna Gopal and Devki Nandan Gupta 64. LP-04 Electron acceleration by asymmetric laser pulses in vacuum in the 73 presence of an axial magnetic field Deep Kumar Kuri 65. LP-05 Effect of Relativistic Mass Variation of Electron on Raman 74 Amplification Characteristics in semiconductor plasma medium Swati Dubey, S. Ghosh and Subhash Chouhan 66. LP-06 Strong and collimated terahertz radiation by photo mixing of 75 Hermite Cosh Gaussian lasers in collisional plasma Sheetal Chaudhary, Manendra and Anil K. Malik 67. LP-07 Third Harmonic Generation via Interaction of Two-Colour Laser 76 Beams with Plasma E. Agrawal 68. LP-08 Laser-plasma accelerators for electron beam generation 77 D. N. Gupta 69. LP-09 Laser Plasma Mediated Synthesis of Ultrathin MoS2-Ag Nano- 78 70. LP-10 hybrid for Sensing Applications 79 Parvathy N, Sivakumaran Valluvadasan, Ravi A V Kumar, Sabu Thomas, Nandakumar Kalarikkal Analytical study of Laser matter interaction in magnetized semiconductors in the presence of a hybrid pump field Ayushi Paliwal, Swati Dubey and S. Ghosh 6

S. No. Talk No. Title of paper and authors Page No. Magnetic Fusion Plasma 71. MF-01 Mechanism of Plasma Blob formation in the Tokamak Scrape-off 80 Layer (SOL) Vijay Shankar, Nirmal Bisai, Shrish Raj and A. Sen 72. MF-02 Simulation of runaway electron distribution function following 81 massive gas injections in ITER-like tokamak and beam energy dissipation Ansh Patel, Santosh P. Pandya 73. MF-03 Nitrogen Seeding in Tokamak Plasma: Non-coronal effects 82 Shrish Raj, N. Bisai, Vijay Shankar and A. Sen 74. MF-04 Comparison of the Ignition of Cylindrical Targets in Magneto- 83 Inertial fusion: non-equilibrium model E. Ghorbanpour, A.Ghasemizad and S.Khoshbinfar Quantum Plasmas 75. QP-01 Dynamics of Nucleus-Acoustic Waves in Compact Astroenvirons 84 P. K. Karmakar 76. QP-02 Recent trends of quantum plasma physics 85 Manisha Raghuvanshi and Sanjay Dixit 77. QP-03 Study of Electron-acoustic solitary waves in ultra-relativistic 86 degenerate quantum plasma with two-temperature electrons Saloni, Alisha, S. Sharma, A. Kaur, and S. Chandra 78. QP-04 Streaming Instabilities in Quantum Plasmas with Effect of 87 Quantum Statistical Pressure Shiva Shakti Singh, Kamakhya Prakash Misra and Jyoti 79. QP-05 Raman and Brillouin scattering instabilities of transverse 88 electromagnetic waves in degenerate electron-ion plasmas N. Maryam, Ch. Rozina, S. Ali and N. L. Tsintsadze 80. QP-06 Rayleigh–Taylor/gravitational instability in dense magnetoplasmas 89 S. Butt, S. Ali and Z. Ahmed 81. QP-07 Ion acoustic waves in slef-gravitating degenerate quantum plasma 90 Sailendra Nath Paul, Arkojyothi Chatterjee and Indrani Paul 82. QP-08 Theoretical Study of High Harmonics Radiation in Magnetized 91 Quantum Plasma N. S. Rathore and P. Kumar 7

S. No. Talk No. Title of paper and authors Page No. 83. QP-09 Effect of Rotation on Rayleigh Taylor instability of Magnetized 92 Quantum Plasma Shraddha Argal, Anita Tiwari, Nusrat Khan and P. K. Sharma 84. QP-10 Behaviour of Electron Acoustic Solitary Waves in an Unmagnetized 93 Quantum Plasma Containing Two Temperature Electrons S Chandra, T. Debnath, S. S Roy, N. Mete 85. QP-11 Nonlinear Self-Gravito-Acoustic Waves in A Self-Gravitating Dense 94 Plasma Kuldeep Singh and N. S. Saini Space and Astrophysical Plasmas 86. SA-01 Nonlinear waves in multi-ion cometary plasma with kappa 95 described electrons Sijo Sebastian, Manesh Michael, Sreekala G and C. Venugopal 87. SA-02 Azimuthal Magnetic Field and Leakage of Field Free Matter from 96 Different Optical Depths of UDs -1 Umangkumar Pandya 88. SA-03 The impact of electron inertia on megnetoradiative quantum 97 plasma D. L. Sutar and R. K. Pensia 89. SA-04 Two-temperature advective transonic accretion flows around black 98 holes A. Shilpa Sarkar and B. Indranil Chattopadhyay 90. SA-05 QCD ghost dark energy under the purview of modified gravity 99 theory Surajit Chattopadhyay 91. SA-06 The Ratio of Shear Viscosity and Entropy Density fall down for 100 Viscous Dark Energy Accretion Sandip Dutta 92. SA-07 Magnetohydrodynamical stability of the Neutron stars under Dark 101 Energy dominated universe Mayukh Bandyopadhyay 93. SA-08 Ion Acoustic Double Layers in a Six Component Cometary Plasma 102 Manesh Michael, S. Shilpa, Sijo Sebastian and Chandu Venugopal 94. SA-09 A Model of Dark Energy to Predict Future Deceleration 103 Promila Biswas 8

S. No. Talk No. Title of paper and authors Page No. 95. SA-10 Stability of Gyrogravitating Magnetized Complex Astroclouds with 104 Cosmic Moderation Effects Pranamika Dutta and Pralay Kumar Karmakar 96. SA-11 Landau Damping of Ion Acoustic Waves in Super Thermal Multi- 105 97. SA-12 Ion Dope Plasma Sujay Kr. Bhattacharya, S. Chattopadhyaya and Sailendra Nath Paul Effect of FLR corrections on thermal instability of thermally 106 conducting viscous plasma with Hall currents and electron inertia Shweta Jain 98. SA-13 Effects of Finite Larmor Radius Corrections and Uniform Rotation 107 99. SA-14 on the Gravitating Instability of Anisotropic Quantum Plasma S. Bhakta, R. K. Chhajlani and R. P. Prajapati Non-Linear Evolution of 3D Kinetic Alfvén Wave in the Presence of 108 Background Density Fluctuations Anju Garg and R. P. Sharma 100. SA-15 Adapted waves in self-gravitating magnetized viscoelastic dusty 109 plasmas with extreme dust-fugacity moderations A. Kalita, and P. K. Karmakar 101. SA-16 Head-on collision between multi-solitons in electron beam plasma. 110 Sunidhi Singla and N. S. Saini 102. SA-17 Magnetohydrodynamic Accretion onto Supermassive Black Holes 111 103. SA-18 Using Mukhopadhyay Pseudo Newtonian Potential Ritabrata Biswas Influence of surface tension on combined Rayleigh Taylor and 112 Kelvin Helmholtz instability Rahul Banerjee 104. SA-19 Hall Effect Thruster Technology- Introduction 113 Satya Prakash Bharti and Sukhmander Singh 105. SA-20 Energy transfer from kinetic Alfvén wave to H +, He + and O + ions 114 in PSBL region Radha Tamrakar, P. Varma and M. S. Tiwari 106. SA-21 Shock Waves in Dense Astrophysical Plasma 115 Rajneet Kaur, K. Singh and N. S. Saini 107. SA-22 Study of Double Layer and Solitary Structures in Inner Ionospheric 116 108. LP-11 Plasma Jit Sarkar, Jyotirmoy Goswami, Swarniv Chandra and Basudev Ghosh Shock Fronts in Dense Laser-Produced Fermi Plasma 117 Jyotirmoy Goswami, Jit Sarkar, Swarniv Chandra and Basudev Ghosh 9

Keynote Address

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India Critical Phenomenon in the Gravitational Collapse of Charged Dust Cloud Khare Avinash Sikkim University, Tadong, Sikkim-737102, India e-mail: [email protected], [email protected] The gravitational collapse of electrically charged dust plays in important role in the formation of protoplanets, stars and other possible structures in molecular clouds. In the paper, we propose a thermodynamic model for the gravitational collapse of cloud of charged dust in the plasma background. Using Gravito-Yukawa potential, an expression for the internal energy of an ensemble of dust particles in the mean field limit is obtained and from this corresponding expressions for Helmholtz energy and pressure of dust are obtained. Using a suitable scaling a universally true equation of state is obtained which shows the existence of a critical temperature TC . For dust temperature T > TC . the cloud is shown to be stable while for T < TC the cloud undergoes a spinodal decomposition showing phase coexistence and first order phase transition from a rare diffused state to s state with dense core. The phase coexistence obeys the law of rectilinear diameters while the critical exponents of the model show a universal behaviour. Hydro dynamically, the phase transition to a dense core can also be viewed as the nonlinear evolution and saturation of Jeans instability. Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 10

Invited Talks

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India IT-01 Can Rayleigh-Benard Convection Cells be “Peeled off” by a Particle-level Fluctuation? Pawandeep Kaur, Rajaraman Ganesh Institute for Plasma Research, HBNI, Gandhinagar, India e-mail: [email protected] When 2D Yukawa liquid confined between two horizontal plates is subjected toexternal gravity and external temperature gradient by heating the bottom plate, an inverted density profile (with denser liquid near the top) emerges in the system (Fig. 1). It has been demonstrated using molecular dynamics simulations that when external temperature difference is further increased beyond a critical value, Rayleigh-Benard convection cells (RBCC) emerge in the system (Fig. 2), which provides stabilization inthe presence of inverted density profile against gravity [1]. The RBCC thus formed is an example of a driven-dissipative system at steady state, in which the total energy shows small fluctuations δE (~0.1%) about the mean value, E0 (Fig. 3). Fig 1. Temperature and Density profiles Fig 2. Fluid velocity(arrows) and Vorticity(colormap) with vertical height, y obtained from particle data illustrating RBCC Fig 3. Total energy vs time showing fluctuations (~0.1%) about mean value, E0 = 0.0172 Are there situations where if a pre-determined particle level perturbation, with energy contributions within the fluctuations, δE, completely change the macroscopic flowprofiles? For example, can the RBCC be “peeled away” to give rise to a new“macroscopic flow pattern” which is again a quasi-steady state? Some of thesequestions will be addressed in the talk. References [1] Harish Charan, PhD Thesis, HBNI (March 2017). [2] Pawandeep Kaur, Rajaraman Ganesh, Rayleigh-Benard system of Yukawa liquid and fluctuations (Manuscript under preparation). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 1111

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India IT-02 A Fresh Look at Waves in Ion-electron Plasmas: Reformulating the Textbook Treatments Rony Keppens Centre for mathematical Plasma Astrophysics, KU Leuven e-mail: [email protected] In many -- if not all -- plasma physics textbooks, a two-fluid treatment of linear waves supported by a uniform, cold ion-electron plasma serves as an introduction to motivate more general, fully kinetic treatments. The ideal two-fluid approach lacks important velocity-phase- space effects like Landau damping, and is thus categorized as being physically incomplete. The latter statement is even more pertinent for the one-fluid ideal magnetohydrodynamic (MHD) model, where only Slow, Alfvén, and Fast waves remain. In a recent paper [1], we revisited the classical textbook treatments for a cold ion-electron plasma, to make more direct contact between the ideal two-fluid approach and the MHD limit. It became evident that all textbook treatments are unduly complex, since they classify waves at fixed frequency and pay particular attention to exactly parallel (to the magnetic field) or exactly perpendicular propagation. We will contrast the textbook view, which emphasizes the Clemmow-Mullaly- Allis diagram (an intricate manner to show wave diversity), with our new categorization in S(low), A(lfvén), F(ast), M(odified) electrostatic mode, and electromagnetic O and X branches [1,2,3]. This six-way categorization directly connects with MHD theory, and elucidates the shortcomings of the textbook approach. It allows to visualize phase and group speed diagrams at all wavelengths, and demonstrates the intricate wave transformations that exist at parallel and perpendicular orientations. Since linear MHD theory uniquely addresses the extension of wave diversity from spatially uniform plasmas, to spatially inhomogeneous configurations, an entirely new research field comes into focus: two-fluid wave spectroscopy. References [1] Keppens & Goedbloed, 2019, Frontiers in Astronomy and Space Science 6, 11(15pp), doi:10.3389/fspas.2019.00011 [2] Keppens & Goedbloed, 2019, Journal Plasma Physics (Letter) 85, 175850101 (11pp), doi:10.1017/S0022377819000102 [3] Keppens, Goedbloed & Durrive, 2019, Journal Plasma Physics 85, 905850408 (28pp), doi:10.1017/S0022377819000552 Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 1122

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India IT-03 Collective Excitations in Strongly and Moderately Coupled Complex Plasmas Sergey Khrapak Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt (DLR), 82234 Weßling, Germany and Joint Institute for High Temperatures, Russian Academy of Sciences, 125412 Moscow, Russia e-mail: [email protected] The purpose of this talk is to summarize recent results related to collective mode spectra in unmagnetized complex (dusty) plasmas. The focus is on effects of particle correlations on the wave properties and the simplest model of complex plasma – one-component Yukawa fluid is adopted. The dispersion relations obtained in extensive molecular dynamics simulations are compared with those from different theoretical approximation. For the longitudinal mode in the strongly coupled regime, the quasi-localized charge approximation (QLCA) provides the accuracy sufficient for most applications. In the weak and moderately coupled regime, the dispersion relation based on the generalized bulk elastic modulus is more appropriate. The transverse mode exists at sufficiently strong coupling, but exhibits a q-gap in the long-wavelength limit. A heuristic approach to describe this gapped dispersion is discussed. Towards the end of the talk I will demonstrate how the effects of strong coupling (correlations), potential softness, and spatial dimensionality affect the magnitudes of the sound velocities. Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 1133

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India IT-04 Perspectives of quantum plasma and warm dense matter theory M. Bonitz1, Zh. Moldabekov2, T. Dornheim3, P. Hamann1, and J. Vorberger4 1Kiel University, Germany 2Al Farabi University, Almaty, Kazakhstan 3CASUS, Görlitz, Gemrny 4 Helmholtz-Zentrum Dresden Rossendorf, Gemrny e-mail: [email protected] Presently we are witnessing dramatic progress in experiments with dense quantum plasmas where matter is being compressed to densities exceeding solid density. At the same time, accurate laser and x-ray based diagnostic tools have emerged that probe the properties of such warm dense matter [1]. To understand these experiments and predict new ones poses a challenge to theory and simulations. Promising tools include generalized quantum hydrodynamics [2,3] and quantum kinetic equations [4]. We will discuss some of the recent theory developments and present accurate results for the electron dynamic structure factor [5] and for the plasmon dispersion in dense quantum plasmas [6]. References [1] M. Bonitz et al., Phys. Plasmas 27, 042710 (2020) [2] M. Bonitz et al., Phys. Plasmas 26, 090601 (2019) [3] Zh. Moldabekov et al., Phys. Plasmas 25, 031903 (2018) [4] M. Bonitz, Quantum Kinetic Theory, 2nd ed. Springer 2016 [5] T. Dornheim et al., Phys. Rev. Lett. 121, 255001 (2018) Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 1144

International e-Conference on Plasma Theory and Simulations (PTS-2020) September 14 & 15, 2020, Bilaspur, India IT-05 Instabilities in Plasma and Dense Plasma R. K. Chhajlani1 and R. P. Prajapati2 1Retd. From S. S. in Physics, Vikram University, Ujjain-456010 (M.P.), India 2Department of Pure and Applied Physics, Guru Ghasidas Central University, Bilaspur-495009 (C.G.), India e-mail: [email protected] The hydrodynamic fluid instabilities are ubiquitous in several space and astrophysical plasma environments such as molecular cloud, stars, interstellar media (ISM), solar wind, comets, asteroid zones etc. Some important fluid instabilities viz. Kelvin-Helmholtz instability (KHI), Rayleigh-Taylor instability (RTI), Jeans gravitational instability, firehose and mirror instability have been investigated by many researchers in past decades. These instabilities play crucial role in structure formation in plasma medium. In this talk, a detailed overview of some fluid instabilities has been presented. The theoretical formulations of fundamental fluid instabilities and governing equations are presented. Many significant results obtained in our recent research work have been analyzed with their astrophysical applications. We also discuss an overview of dense quantum plasma with fundamental characteristics of degeneracy and Bohm potential. The waves and firehose instability in anisotropic quantum plasma are investigated and many significant results have been obtained. The onset criterion of the “firehose” instability is retained in parallel propagation, which is unaffected due to the presence of quantum corrections. The fast, slow, and intermediate QMHD wave modes and linear firehose and mirror instabilities are analyzed for isotropic MHD and CGL quantum fluid plasmas. References [1] R. P. Prajapati, Phys. Plasmas, 21, 112101 (2014). [2] R. P. Prajapati and R. K. Chhajlani, Astrophys. Space Sci., 350, 637 (2014). [3] S. Bhakta, Bivash Dolai and R. P. Prajapati, Phys. Plasmas, 23, 082113 (2017). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 1155

IT-06 Neutrino-Driven Instability of Ion Acoustic Waves in a Degenerate Plasma N. S. Saini1, Y. Ghai2 and B. Eliasson3 1Department of Physics, Guru Nanak Dev University, Amritsar, India 2Burning Plasma Physics Foundations, ORNL, Oak Ridge, Tn, USA 3Department of Physics, University of Strathclyde, Glasgow, UK e-mail: [email protected] The mechanism of a core-collapse supernova due to the gravitational death of a massive star is considered to be one of the most complex and physically rich astrophysical phenomena. The investigation of a supernova comprises the study of plasma dynamics in a strong gravitational field while considering the transport of intense neutrino beams from the core to the outer layers of the supernova progenitor. At the advanced stages of stellar evolution, the electron–positron pair annihilation is the main process responsible for the production of neutrinos. The interaction of neutrinos with the core plasma may lead to different kinds of hydrodynamic instabilities in the supernova core during the first few seconds of the explosion. These instabilities are of potential importance as they may trigger the explosion, or create the seed for the ejecta asymmetries observed later on. In this talk, author will focus on the study of neutrino-driven streaming instability of the IAWs with relevance to plasma conditions at the last stage of stellar evolution in a massive supernova progenitor. The influence of neutrino beam parameters such as the energy of the incident neutrino beam and eigenfrequency of the neutrino flavor oscillations on the instability growth rate will be highlighted. It is observed that the neutrino flavor oscillations significantly affect the neutrino-driven instability of the IAWs. The results of this investigation may be of great importance for understanding of the underlying physical mechanism responsible for the core-collapse supernova. References [1].H-Th. Jankaa, K. Langanke, A. Marek, et al. , PhR 442, 38 (2007) [2] J. T. Mendonça and F. Haas, PhPl 20, 072107 (2013) [3] S. Chandrasekhar, MNRAS 95, 207 (1935) [4] A. Mezzacappa, and O. E. B. Messer, JCoAM 109, 281 (1999) [5] Y. Ghai, N. S. Saini and B. Eliasson, APJ 884, 27 (2019) Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 1166

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India IT-07 Exoplanet Migration in Magnetized Discs B. P. Pandey Department of Physics & Astronomy & Research Centre for Astronomy, Astrophysics & Astrophotonics, Macquarie University, Sydney 2109, Australia e-mail: [email protected] Since the discovery of first exoplanet in 1989 [1] the number of detected exoplanet has reached close to 4000 among which the Kepler mission has played a major role in contributing over two thirds of these discoveries [2]. Exoplanets broadly fall into three groups [3]: (a) hot Jupiter (~ 1000 K) with a period of few days; (b) eccentric giants with the mass typically about twice the Jupiter mass, the eccentricity ~ 0.22 and the period between hundred to thousand days; (c) planets with the mass ~1-50 Earth mass and periods ranging from days to months. The physical conditions at 0.1-1 AU in protoplanetary discs are not conducive to the in-situ formation of large (~ 10 Earth mass) icy, rocky cores and so the currently favoured core accretion model assumes that the initial planet embryo formed at least a few AU away from the solar nebula before migrating to the planet’s current location. Therefore, the gravitational interaction of the planet with the natal protoplanetary disc or, with the nearby planets must have played an important role in its evolution. The planet-disc angular momentum exchange via resonant density wave results in the inward type I migration of the planet [4] when the Hill radius of the planet is smaller than the disc scale height. However, owing to the brisk inward type-I migration, the very survival of the planet is at risk. Large scale open, interstellar magnetic field that originally thread the parent molecular cloud cores are dragged inward during the gravitational collapse of the cloud. The magnetic field transports the angular momentum vertically via the magnetic torque which may dramatically affect the planet migration. Density waves in a differentially rotating disc can be excited not only by the pressure, or by the self-gravity (as is the case in a purely hydrodynamic disc) but also by the magnetic stresses provided the disc is simultaneously threaded by both the radial and vertical magnetic fields. However, unlike hydrodynamic discs, where these waves carry an excess (deficit) of angular momentum flux outside (inside) the corotation radius (where the disc rotation frequency matches the wave pattern frequency), in a poloidally threaded magnetized disc these waves carry negative (positive) angular momentum flux outside (inside) the corotation radius. Therefore, the net torque on the planet will be considerably modified in the presence of magnetic field. The resulting type-I migration of the planet will be an order of magnitude slower than in the absence of the magnetic field. References [1] D. W. Latham, R. P. Stefanik, T. Mazeh, M. Mayor and G. Burki , Nature, 339, 38 (1989). [2] W. J. Borucki et al., Science, 327 (5968):977 (2010). [3] G. Laughlin and J. J. Lissauer, astroph/1501.05685 (2015). [4] W. R. Ward, Icarus, 126, 261 (1997). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 1177

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India IT-08 Experiments in DC Coulomb Crystals Pintu Bandyopadhyay, M. G. Hariprasad, A. Saravanan, Garima Arora and Abhijit Sen Institute for Plasma Research, HBNI, Bhat, Gandhinagar, India e-mail: [email protected] We report first experimental observation of a stable dusty plasma Coulomb crystal produced in the cathode sheath of a DC glow discharge plasma [1]. These observations are made in the dusty plasma experimental (DPEx) device where crystals made of mono-disperse micron sized melamine formaldehyde particles are produced in the background of an Argon plasma. The crystalline nature of the structure is confirmed through a host of characteristic parameter estimations, which includes the radial pair correlation function, Voronoi diagram, Delaunay Triangulation, the structural order parameter, the dust temperature, and the Coulomb coupling parameter. The crystal formation is frequently found to be accompanied by the presence of one or more slightly heavier particles suspended a little below the monolayer. The interplay of one such test particle with the crystal is investigated for two distinct cases: when the particle remains confined (trapped) in the space below the crystal and when it interacts for a short while with the crystal and then moves out of the vicinity. The trapped particle orbit induces permanent structural changes in the crystal in the form of microcracks, which can be enhanced by energizing the test particle with an incident laser [2]. This crystalline structure can be melted to a liquid state by changing the discharge parameters. The nature of the melting or formation process in our experiment is established as a first-order phase transition from the variations in the Coulomb coupling parameter, the dust temperature, the structural order parameter, and from the existence of a hysteresis behavior [3]. Our experimental results are distinctly different from existing theoretical predictions for two-dimensional crystals based on the KTHNY mechanism or the grain boundary induced melting and indicates a mechanism that is akin to a fluctuation induced first-order phase transition in complex plasmas. In some specific discharge conditions, the liquid and crystalline states are found to coexist. References [1] M. G. Hariprasad, P. Bandyopadhyay, Garima Arora, and A. Sen, Phys. Plasmas 25, 123704 (2018). [2] M. G. Hariprasad, P. Bandyopadhyay, Garima Arora, and A. Sen, Phys. Plasmas 26, 103701 (2019). [3] M. G. Hariprasad, P. Bandyopadhyay, Garima Arora, and A. Sen, Phys. Rev. E, 101, 043209 (2020). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 1188

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India IT-09 Landau Damping Due to Multi-plasmon Resonances in a Degenerate Plasma: A New Nonlocal Korteweg-de Vries equation D. Chatterjee1, A. P. Misra1, G. Brodin2 1Department of Mathematics, Visva-Bharati (A Central University), Santiniketan, India 2Department of Physics, Umeä University, Sweden e-mail: [email protected] A new nonlocal Korteweg-de Vries (KdV) equation for electron-acoustic waves (EAWs), modified by the effects of phase velocity and multi-plasmon resonances, is derived from the Wigner-Moyal and Poisson equations by a multi-scale asymptotic expansion technique in a fully degenerate plasma with two-temperature electrons and stationary ions. Besides giving rise to a nonlocal nonlinear term, the wave-particle resonances also modify the local nonlinear coupling coefficient of the KdV equation. The latter is shown to conserve the number of particles, however, the wave energy decays with time. An approximate soliton solution of the nonlocal KdV equation is obtained and it is shown that the nonlinear Landau damping causes the wave amplitude to decay with time as (T+T0)-2/3 which is distinctive from the theory of Ott and Sudan [Phys. Fluids, 12, 2388 (1969)]. References [1] E. Ott and R. N. Sudan, Phys. Fluids, 12, 2388 (1969). [2] S. Fahad, M. Ahmad, Q. Jan, and F. Akram, Contrib. Plasma Phys, 59, e201900041 (2019). [3] A. P. Misra, D. Chatterjee, and G. Brodin, Phys. Rev. E, 96, 053209 (2017). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 1199

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India IT-10 Nonlinear mixing of oscillations in dusty plasma Ajaz A Mir1, Sanat K Tiwari1, John Goree2, Abhijit Sen3, Chris Crabtree4 and Gurudas Ganguly4 11Indian Institute of Technology Jammu, Jammu, India 2Institute for Plasma Research, Gandhinagar, India 3Dept. of Physics & Astronomy, Univ. of Iowa, Iowa City, USA 4Naval Research Laboratory, Washington D.C., USA e-mail: [email protected] Many physical systems that can sustain large-amplitude waves exhibit the nonlinear wave mixing phenomenon. A linear wave-mixing (superposition) leads to the formation of beat waves. Complex forms of mixing are observed when large-amplitude waves interact through the nonlinearity of the medium. The dusty plasma is one such medium where the dust acoustic waves can attain large amplitudes. We present a forced- Korteweg-de Vries model to explain the mixing phenomena in dusty plasma fluid with a specific form of spatial-temporal nonlinearity. The model equation admits an exact analytic solution for time-dependent sinusoidal forcing term. For non-sinusoidal time-dependent forcing, semi-analytic solutions have been found and solved numerically. The solution for each case displays a wide variety of wave-mixing phenomena. Many of the spectra's modes are the sum and difference frequencies of the fundamental dust oscillation and the external forcing (and their harmonics). We also validated the origin of the mixing modes through a Bispectral analysis. In line with the theoretical model, we propose a dusty plasma experiment, where a sinusoidal forcing can be introduced using a laser. Similarly, the non-sinusoidal forcing can be excited through electrical pulse generators, large-amplitude lasers, etc. Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 2200

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India IT-11 Modeling X-ray Free Electron Laser Irradiated Matter V. Saxena1, Z. Jurek2,3, S.-K. Son2,3, B. Ziaja2,4, R. Santra2,3,5 1Department of Physics, Indian Institute of Technology Delhi, New Delhi 110016, India 2Center for Free Electron Laser Science, DESY, 22607 Hamburg, Germany 3Hamburg Center for Ultrafast Imaging, 22761 Hamburg, Germany 4Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Krakow, Poland 5Department of Physics, University of Hamburg, 20335 Hamburg, Germany e-mail: [email protected] The X-ray free electron lasers (XFELs) are promising light sources for applications ranging from single molecule imaging of unknown biological matter to following ultra- fast processes in real time such as chemical reactions, photosynthesis etc. To better understand the interaction of an XFEL pulse with matter, rare gas clusters are considered perfect test objects, owing to the varied sizes they can be prepared in. In this talk, I will discuss about the main numerical approaches used to model the interaction of bright XFEL pulses with matter, mainly with rare gas clusters. References: [1] Y. Kumagai et al., Phys. Rev. A, 101(2) , 023412 (2020). [2] M. Makita et al., Sci. Rep., 9, 602 (2019). [3] Y. Kumagai et al., Phys. Rev. Lett., 120, 223201 (2018). [4] Z. Jurek et al., J. Appl. Cryst. 49, 1048-1056 (2016). [5] B. Ziaja et al., Phys. Rev. E, 93, 053210 (2016). [6] V. Saxena et al., Phys. Plasmas, 23, 012710 (2016). [7] V. Saxena et al., High Energy Density Physics, 15, 93-98 (2015). [8] T. Tachibana et al., Sci. Rep., 5, 10977 (2015). [9] C. Peltz et al., Phys. Rev. Lett. 113, 133401 (2014). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 2211

IT-12 Nonlinear Interaction of Ultra-intense Laser Pulse with Plasma Gunjan Purohit Department of Physics, DAV(PG) College, Dehradun-248001, Uttarakhand, India e-mail: [email protected] Rapid advancements in the laser technology has resulted in intensity levels surpassing 1022 W/cm2. The interaction of such short ultrahigh-intensity laser pulses with plasmas is a frontier area of research in the context of many exciting applications ranging from the laser driven fusion to the building of the compact advanced particle accelerators and next generation radiation (x-rays) sources. These applications need the laser beams to propagate over several Rayleigh lengths in the plasmas without loss of the energy. When a high-power laser beam interacts with the plasma, various nonlinear phenomena/parametric instabilities such as self-focusing, filamentation, stimulated Raman scattering, stimulated Brillouin scattering etc. take place and due to this, energy of high-power laser beam is not efficiently coupled to the plasma. These instabilities can produce energetic electrons which can preheat the fusion fuel and reduce the compression rate. They can limit the laser propagation distance; modify the intensity distribution and affecting the uniformity of energy deposition under conditions relevant for inertial confinement fusion (ICF) scheme and particle acceleration process. The physics of these instabilities in laser plasma interaction is not fully understood at ultrahigh intensities. It is important to understand and develop the mechanisms which control the growth of these instabilities and their saturation for the successes of these applications. In order to understand the nature of these instabilities, we have carried out work on these instabilities. This talk will review plasmas, lasers, ultra-intense laser plasma interaction and applications as well as various issues of laser plasma interaction. Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 2222

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India IT-13 Transient Nonlinear Interactions in Semiconductor Plasmas Swati Dubey School of Studies in Physics, Vikram University Ujjain, Ujjain, India e-mail: [email protected] A semiconductor plasma medium is found to offer the greatest device potential. The current activities in semiconductor nonlinear optics was stimulated by the demonstration of strong, sharp, excitonic resonance in GaAs, GaAlAs and several direct gap alloy semiconductors. III-V semiconductors are substantially transparent for photon energies less than the band gap energies [1], hence treated as a unique class of materials for self interaction type of experiments, as they exhibit an unusually large variety of nonlinear phenomena. Transient characteristics of nonlinear optical effects influence the rapidity with which various kinds of optical functions can be performed. In view of availability of state of art ultrafast pulsed lasers having pulse duration comparable or smaller than phonon life time, it is imperative to study evolution of various nonlinear interactions in time. On considering that the pulse duration of the pump is much smaller than the relaxation time of carriers, temporal derivatives could be explored. Following standard approach [2], Mathematical model has been developed which comprises of Maxwell’s equations and hydrodynamic model for one component plasma and coupled mode theory. These equations are solved numerically in the whole time range up to steady state for a crystal. Graphical analysis of the transient amplification characteristics of a semiconductor plasma medium by considering a tolerable small phase mismatch to compose an experimentally viable situation will be discussed [3]. The talk will cover overall research activity and its applications in this field. References [1] P.A. Wolf, Nonlinear Optics,ed. P.G. Harper and B.S. Wherret, Academic, London (1977) pp 169-212. [2] S. Guha, P.K. Sen and S. Ghosh, Phys. Stat. Sol. (a) 52, 407 (1979). [3] S. Ghosh, Swati Dubey and Kamal Jain, Acta Physica Polanica A, 135 (3), 363-367 (2019). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 2233

Oral Presentations

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India Oral-01 Properties of Magnetohydrodynamic Modes in Compressively Driven Plasma Turbulence K. Makwana1,2 and H. Yan2,3 1Department of Physics, Indian Institute of Technology Hyderabad, Hyderabad, India 2Deutsches Elektronen Synchrotron (DESY), Platanenallee 6, D-15738 Zeuthen, Germany 3Institut für Physik und Astronomie, Universität Potsdam, D-14476 Potsdam, Germany e-mail: [email protected] We study magnetohydrodynamic (MHD) plasma turbulence in terms of MHD eigenmodes – the Alfven, slow magnetosonic, and fast magnetosonic modes – by linearly decomposing numerically simulated turbulence data into these modes. In these simulations turbulence is driven by varying levels of solenoidal and compressible forcing. We find that the proportion of magnetosonic modes, especially the fast modes, increases with increasing fraction of compressible forcing. The Alfven mode cascade is anisotropic. We find properties of weak Alfvenic turbulence at low Alfven mach number (MA), while strong turbulence properties are observed at high MA. We are also able to identify the scale at which the Alfvenic turbulent cascade transitions from weak to strong, as predicted by theory. The slow mode properties are similar to Alfven modes. The fast mode shows an isotropic cascade with no change going from low to high MA. This work identifies the conditions under which fast modes can play a prominent role in turbulence, even though the Alfvenic cascade may be weak. This can have important implications for turbulent reconnection, particle diffusion, and cosmic ray scattering. References [1] K. Makwana and H. Yan, Physical Review X, 10, 031021 (2020). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 24

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India Oral-02 Thermodynamics of Yukawa Gas: Simulation and Application Manish K Shukla​1,​ K Avinash​2 1J​ awaharlal Nehru College, Pasighat, India 2S​ ikkim University, Gangtok, India E-mail: [email protected] Using three dimensional Molecular Dynamics simulations, different thermodynamic processes like Isothermal expansion and Free expansion, are studied for the weakly coupled Yukawa systems. An equation of state relating pressure to the number density is obtained for the isotheral process. The equation of state reveals that the gas pressure not only contains the usual kinetic pressure term but also a term having quadratic dependence on the number density. In the free expansion process, the heating effect is observed. A scaling of temperature with the number density is also obtained for the free expansion process which shows that the change in gas temperature is directly proportional to the change in number density of the gas. The simulation findings are explained on the basis of a thermodynamic model proposed by Avinash. An application of the equation of state is demonstrated in the context of “structure formation” of self-gravitating dusty plasmas in the astrophysical conditions. References [1] MK Shukla, K Avinash, R Mukherjee and R Ganesh, ​Phys. Plasmas​, 2​ 4​, 113702 (2017) [2] MK Shukla and K Avinash, arXiv: 1910.06364 [3] K Avinash, P​ hys. Plasmas,​ ​17​, 12710 (2010). [4] MK Shukla and K Avinash, P​ hys. Plasmas​, 2​ 6​, 013701 (2019) Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India   25

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India Oral-03 New Type of Jeans Instability and Nonlinear Landau Damping of Circularly Polarized EMWS Ch. Rozina1 and N. L. Tsintsadze2 1 Department of Physics, Lahore College for Women University, Lahore 54000, Pakistan 2 Faculty of Exact and Natural Sciences, Andronicashvili Institute of Physics, Tbilisi State University, Tbilisi 0105, Georgia e-mail: [email protected] A kinetic theory of the Jeans instability of a self-gravitating dusty plasma has been developed in the presence of nonlinear Landau damping (NLD) term. We demonstrate that NLD alters the growth rate of the gravitational collapse of the gravitating dusty plasma. The dispersion relation of modified Jeans instability is obtained and analyzed for specific conditions. Jeans frequency is compared with the dust acoustic frequency; new definition of Jeans wave length is introduced. The maximum growth rate is obtained for a particular condition as well as the Jeans critical mass is defined. Next to address the heating of plasma through radiation processes, we investigate the nonlinear theory of high frequency electromagnetic waves (EMWs) in a collisionless dusty plasma by using a set of Vlasov-Poisson equations. The effects of the nonlocal nonlinear Landau term (appearing due to the nonlinear interaction of EMWs with gravitating dusty plasma) in the nonlinear Schrödinger equation are examined. It is found that nonlinear Landau damping of EMWs leads to transfer of effective energy to the plasma particles, the corresponding decay rate of EMWs appears to be a function of amplitude of electromagnetic pump waves, and damping can be faster in the presence of large ion number density. Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 26

Oral-04 Wave Breaking Amplitude of Electron Acoustic Solitary Waves in an Unmagnetised Plasma with Kappa-Distributed Electrons Arghya Mukherjee Center of Excellence in Space Sciences India, IISER Kolkata, West Bengal, 741246, India e-mail: [email protected] The maximum electric field amplitude that a certain plasma mode can carry, without losing it periodicity, is called its Wave Breaking amplitude. We present an analytical expression for the maximum electric field amplitude (wave breaking amplitude) sustained by electron acoustic solitary waves (EASW) [1] in an unmagnetised homogeneous plasma comprising cold inertial electrons, hot Kappa distributed electrons and stationary ions. Using the nonlinear fluid-Maxwell's equations in one dimension (1-D), travelling wave solutions have been derived in the wave frame and negative potential solitary structures have been observed [2]. Further pseudo-potential method [3] has been employed to obtain an analytical expression for wave breaking limit of EASWs. From the theoretical analysis it has been found that the maximum electric field amplitude sustained by EASWs decreases with hot electron species temperature and increases monotonically with the density ratio of hot to cold electron species. Our results are relevant for understanding the dynamics of EASWs in space and laboratory plasma where two different species of electron distributions are commonly encountered. References [1] S. P. Gary and R. L. Toker, Phys. Fluids, 28, 2439 (1985). [2] A. Danehkar, N. S. Saini, M. A. Hellberg and I. Kourakis, Phys. Plasmas, 18, 072902 (2011). [3] A. G. Khachatryan, Phys. Rev. E, 58, 7799 (1998). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 27

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India Oral-05 Nonlinear Structure Formation in Nonideal Protoplanetary Disks Pankaj Sarma, and Pralay Kumar Karmakar Department of Physics, Tezpur University, Napaam-784028, Tezpur, Assam, India e-mail: [email protected] In this semianalytic work, we develop a nonlinear nonideal magnetohydrodynamic (MHD) model formalism to investigate the evolutionary dynamics of varied eigenstructure patterns in the protoplanetary disks [1-2]. The main motivation behind is fully mobilized with an aim to analyse the naturalistically excitable nonlinear eigenpatterns in the inhomogeneous disks of infinite spatial extension in an axisymmetric geometry. It is assumed that the complex dusty disk is initially in a magnetohydrostatic homogeneous equilibrium configuration [3]. A standard technique of nonlinear normal mode analysis over the perturbed disk results in a second-order nonlinear partial differential equation in terms of the perturbed gravitational potential curvature moderated by the axisymmetric geometrical effects. A numerical illustrative platform is constructed to explore the naturalistic excitation of a plethora of rarefactive solitary peakons of atypical shapes and types. The wave amplitude strength interestingly varies inversely with the Alfvenic Mach number, and vice-versa. The extreme solitary peakon shifts in an anti-disk-centric direction with an enhancement, mainly in an anti- correlation with the Alfvenic Mach number, and so forth. The physical insights behind such nonlinear structures are illuminated in a collective meanfluidic reorganizational fabric [1-3]. The eigenstructural saturation takes place via the amplitude and phase coordination among the various excited spectral components of the perturbations. In conclusion, we present the tentative roles of the explored nontrivial antilinear eigenspectral pulses in the active wave- induced accretive-decretive fluid matter transport and redistribution processes in varied astrocosmic environs, thereby triggering the nonhomologous astrostructure creation dynamics. References [1] M. Wardle, Astrophys. Space Sci., 292, 317 (2004). [2] P.K. Karmakar and P. Sarma, Europhys. Lett., 121, 35001 (2018). [3] J. Binney and S. Tremaine, Galactic Dynamics, Princeton University Press, USA (1987). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 28

Oral-06 A 3+ 1 Moment Gyro-Fluid Model to Study Energetic Particles Instabilities in Fusion Plasma Y. Ghai1, D. A. Spong,1 J. Varela2, L. Garcia3 1Oak Ridge National Laboratory, Oak Ridge, Tennessee 36831-60, USA 2National Institute for Fusion Science, Toki, 509-5292, Japan 3Universidad Carlos III de Madrid, 28911 Leganes, Madrid, Spain e-mail: [email protected] Energetic particle (EP) driven instabilities arise when fast ions undergo resonant interactions with plasma Alfvén waves in fusion device. EP instabilities have been extensively studied to determine the device first wall heat load as well as to plan experimental scenarios. Gyro-Landau fluid models have been used to model the EP instability in such studies while emulating kinetic effects for the fast particles via precise truncation of the moment equations with appropriate Landau closure relations. We have developed a gyro-fluid model comprising four moment equations for fast ions derived by taking up to second order velocity moments of the electromagnetic gyrokinetic equation while considering a velocity dependent drift frequency. The 3+1 moment gyro-fluid model will be implemented in FAR3D code which solves the reduced MHD equations for thermal plasma with addition of moment equations for the energetic ions to study the EP instabilities. The extended gyro-fluid model shall present an opportunity for a new optimal closure technique to study energetic particle driven Alfvén instabilities in fusion devices. References [1] D. A. Spong, B. A. Carreras, and C. L. Hedrick , Physics of Plasmas, 4, 3316 (1992). [2] J. Varela et al. , Nuclear Fusion, 58, 076017 (2018). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 29

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India Oral-07 Study of the Formation of Rogue Waves in an Adiabatic Electronegative Plasma Rajkamal Kakoti and K. Saharia Department of Physics, North Eastern Regional Institute of Science and Technology, Nirjuli, Arunachal Pradesh-791109, India e-mail: [email protected] The present investigation addresses the formation and propagation of rogue waves in an unmagnetized collisionless electronegative plasma (ENP) consisting of adiabatic inertialess electrons, adiabatic inertialess negative ions, and mobile positive ions. The inertia of the negative ions can be neglected because, by assumption, their bulk velocity is much smaller than the thermal velocity. The rapidly growing interest in the study of electronegative plasma (ENP) is not only because of its large scale applications in the industries, but also its occurrence in space, and laboratory plasmas.[1, 2] The consideration of adiabatic species in the present model provides a more general and realistic plasma.[2] The modulational instability (MI) has been suggested to be the most possible mechanism for the formation of rogue waves (RWs) in various fields of physics ranging from optics, biophysics to plasma physics in the past.[3] The reductive perturbation technique has been employed to derive a nonlinear Schrodinger equation (NLSE) for the study RWs in our model.[3] In examining the stability/instability of the ion-acoustic envelope wavepackets, the critical wavenumber kc at which MI sets in is found to be shifted to higher values as adiabaticity  increases. Our present investigation may be useful for the study of formation and propagation of RWs in the laboratory as well as space plasmas. References [1] Y. Ghim and N. Hershkowitz, Appl. Phys. Lett. 94, 151503 (2009). [2] A. A. Mamun, S. Tasnim, and P. K. Shukla, IEEE Trans. Plasma Sci. 38, 3098 (2010). [3] W. M. Moslem, R. Sabry, S. K. El-Labany, and P. K. Shukla, Phys. Rev. E 84, 066402 (2011). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 30

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India Oral-08 Three-dimensional Rogue Waves in D-F Regions of Earth's Ionosphere with Hybrid-Cairns-Tsallis-distributed Electrons and Positrons S. K. El-Labany1,2, W. F. El-Taibany1,2, N.A. El-Bedwehy2,3 and N. A. El-Shafeay1,2 1Department of Physics, Damietta University, New Damietta, P.O. 34517, Egypt 2Center of Space Research and its Applications (CSRA), Damietta University, New Damietta, P.O. 34517, Egypt 3Department of Mathematics, Damietta University, New Damietta, P.O. 34517, Egypt e-mail: [email protected] In this work, a three-dimensional (3D) modulational instability (MI) of ion acoustic waves (IAWs) in a four-components magneto-plasma system consisting of a positive-negative ions fluid and hybrid-Cairns-Tsallis-distributed electrons and positrons, is investigated. The basic system of fluid equations is reduced to a 3D nonlinear Schrödinger equation (NLS) which is valid for small but finite amplitude of the IAWs using a reductive perturbation technique. The domain of the stability and instability regions is presented which is found strongly to be affected by the hybrid-Cairns-Tsallis-distributed electrons and positrons parameters α and q (which α is the nonthermal parameter and q is the non-extensive parameter) and temperature ratio Tp/Te. The existence domains for observing the first-and second-order solutions of the ion acoustic rogue waves (IARWs) are determined and their basic features (viz. the width and amplitude) are found to be significantly dependent on the system physical parameters changes such as Tp/Te and the external magnetic field strength as well as the distribution parameters α and q. Finally, a comparison between the first-and second-order rogue waves solution is investigated. Moreover, the implication of our consequences in space plasma [e.g. (H, H), (H, O) electronegative plasma in D-F regions of Earth’s ionosphere] and in laboratory [e.g. (Ar, F) electronegative plasma] are briefly discussed. Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 31

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India Oral-09 Collisional Two Ion Species Plasma with Bi-Maxwellian Electrons and Bohm Condition S. Basnet and R. Khanal Central Department of Physics, Tribhuvan University, Kirtipur, Kathmandu, Nepal e-mail: [email protected] Presheath and sheath structures of collisional two ions (helium and argon) species plasma in the presence of Bi-Maxwellian electrons has been investigated by using fluid model. As the thermal energy of hot electrons is higher than cold electrons, the electron impact ionization process is totally governed by the concentration of hot electrons. The velocity of positive ions at the sheath boundary i.e., the Bohm condition gets modified in the presence of ion-neutral drag force, source term and Bi-Maxwellian electrons. It is found that the ion-neutral drag force, ionization rates and volumetric composition of electrons affect the presheath and sheath characteristics. The acoustic speed of helium ion at the sheath boundary is higher than its common speed whereas the acoustic speed of argon ion is lower than its common speed. The scale length of non-neutral sheath region lengthens with the increase in both the drag force and concentration of hot electrons. In the same scenario, the ion velocity at the sheath boundary when they leave the bulk plasma decreases. Furthermore, the effect of ionization rates on two ion species plasma has been presented. References [1] V. A. Godyak, V. P. Meytlis, and H. R. Strauss, IEEE Transactions on Plasma Science 23(4), 728 (1995). [2] G. D. Severn, X. Wang, E. Ko, and N. Hershkowitz, Phys. Rev. Lett. 90(14), 145001 (2003). [3] S. D. Baalrud and C. C. Hegna, Phys. Plasmas 18, 023505 (2011). [4] N.-K. Kim et al., Plasma Sources Sci. Technol. 26, 06LT01 (2017). [5] S. Basnet and R. Khanal, Plasma Phys. Control. Fusion 61, 065022 (2019). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 32

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India Oral-10 Study of Electron-Impact Fine-Structure Excitation of Kr+ Ion Shivam Gupta1, and Rajesh Srivastava1 1Department of Physics, Indian Institute of Technology Roorkee, Roorkee-247667, India e-mail: [email protected] Study of electron impact excitation of Kr+ ions is carried out in understanding and diagnosing the non-equilibrium krypton plasma. Such studies are important for the development of electric propulsion thruster technologies as well as for other applications [1]. In the spectral measurements of inert gas plasmas few emission lines of their singly ionized ions are also observed which can also be used for the characterization of the same plasma [2, 3]. The electron impact excitation cross-sections of Kr+ ion is not available in the literature and hence the calculation is performed for the large number of transitions from the ground state to the different fine structure levels using the RDW method. In the calculation, multi-configuration Dirac-Fock bound state wave functions of Kr+ ion is first calculated using the GRASP2K code [4]. Thereafter, the calculated bound state wave functions of the ion is used in the calculation of EIE cross-sections using RDW theory. The cross-section and corresponding rate coefficients are calculated for several fine structure transitions of the Kr+ ion. The analytic fittings of the cross-sections are also performed for direct use in any plasma model. Further, the linear polarization of subsequent photon emissions from the decay of electron excited states of the ion is obtained. Such calculated results of the Kr+ ion will be utilized in developing future CR models. References [1] Benjamin D Prince, Raymond J Bemish, and Yu-Hui Chiu, J. Propul. Power, 31, 725-736 (2014). [2] T Czerwiec and D B Graves, J. Phys. D: Appl. Phys., 37, 2827-2840 (2004). [3] A De Castro, J A Aparicio, J A Del Val, V R Gonz_alez, and S Mar, J. Phys. B: At. Mol. Opt. Phys., 34, 3275 (2001). [4] Per Jonsson, X He, C Froese Fischer, and I P Grant, Comput. Phys. Commun., 177, 597-622 (2007). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 33

Oral-11 Gaussian Laser Pulse Driven Terahertz Radiation in the Plasma Shikha Sharma1,2 and Reenu Gill1 1 Manipal University Jaipur, Jaipur, India 2 S.S.Jain Subodh Girls P.G. College Jaipur, India e-mail: [email protected] High power terahertz (THz) radiation have attracted attention over the past ten years since they can serve as a unique and versatile tool in various fields from biological imaging to material science[1–2]. Three key performance factors of THz are the peak THz electric field strength (or pulse energy), THz bandwidth, and efficiency of conversion. Several schemes have been proposed to generate THz radiation through laser-plasmas interactions [3-4]. Hence, we proposed a scheme based on laser beating in plasmas. A scheme for generation of terahertz (THz) radiation in plasma by highly intense Gaussian laser beam profile, based on beating of two Gaussian beams of slightly different frequencies and wave numbers. Terahertz wave is resonantly excited at frequency and with a wave number mismatch factor which is introduced by the periodicity of plasma density ripples. In this process, the laser exerts a nonlinear ponderomotive force on plasma electrons and imparts them an oscillatory velocity with both transverse and longitudinal components in the presence of transverse static magnetic field. The oscillatory velocity couples with density ripples and produces a nonlinear current J NL that resonantly excites the terahertz radiation, it is the driving factor for THz generation. With the help of Maxwell wave equation the electric field and hence energy, efficiency and intensity of the emitting THz radiation would be calculated. References [1] P.H.Siegel, IEEE Trans. Micro wave Theory Tech.52, 2438 (2004). [2] B.E. Cole, J.B. Williams, B.T. King, M.S. Shervin, and C.R. Stanley, Nature (London), 410, 60 (2001). [3] Z.-Y. Chen, “High field terahertz emission from relativistic laser-driven plasma wakefields,” Phys. Plasmas 22, 103105 (2015). [4] S. Kumar, R. K. Singh, and R. P. Sharma, “Strong terahertz generation by optical rectification of a super-Gaussian laser beam,” EPL 114, 55003 (2016). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 34

International e-Conference on Plasma Theory and Simulations (PTS-2020), September 14 & 15, 2020, Bilaspur, India Oral-12 Self-Focusing of Non-Gaussian Laser Beam in an Inhomogeneous Plasma with Density Variation Nidhi Pathak1, T. S Gill1 and Sukhdeep Kaur1 1Department of Physics, Guru Nanak Dev University, Amritsar 143005, Punjab, India e-mail: [email protected] In this paper, propagation characteristics of non-Gaussian laser beam in an inhomogeneous plasma with modulated density transition have been studied. The numerical analysis of second order non-linear differential equation have been done to derive the envelope equation using moment theory approach for appropriate set of parameters under the impact of ponderomotive and relativistic non-linearities. We observe that self-focusing enhances with increase in density transition and time factor. The conclusions drawn are valuable in applications of high harmonic generation, X-ray generation and inertial confinement fusion. References [1] J. F. Lam, B. Lippmann, and F. Tappert, The Physics of Fluids, 20, 1176 (1977). Department of Pure and Applied Physics Guru Ghasidas Central University, Bilaspur (C.G.)-495009, India 35