Sayan Adhikari

• Brask, Steffen Mattias; Marholm, Sigvald; Di Mare, Francesca; Adhikari, Sayan; Spicher, Andres & Takahashi, T. [Show all 7 contributors for this article] (2022). Electron-neutral collisions effects on Langmuir probe in the lower E-region ionosphere. Physics of Plasmas. ISSN 1070-664X. 29(3), p. 1–11. doi: 10.1063/5.0079761.
• Sharma, G; Deka, K; Paul, R.; Adhikari, Sayan; Moulick, R & Kausik, S. S. [Show all 7 contributors for this article] (2022). Study of Ion-Acoustic Waves in Two-Electron Temperature Plasma. Springer Proceedings in Physics. ISSN 0930-8989. 265, p. 355–361. doi: 10.1007/978-981-16-5141-0_38.
• Deka, Kishor; Paul, R.; Sharma, Gunjan; Adhikari, Sayan; Moulick, R. & Kausik, S.S. [Show all 7 contributors for this article] (2022). Study of Plasma Sheath in the Presence of Dust Particles in an Inhomogeneous Magnetic Field. Springer Proceedings in Physics. ISSN 0930-8989. 265, p. 363–373. doi: 10.1007/978-981-16-5141-0_39. Show summary

  In plasma processing devices, negatively charged dust particles appear as contaminants in etching, sputtering, and deposition processes. The dynamics of the dust particles at the edge region of the plasma plays an important role in such processes. The present study deals with a low-pressure plasma to investigate the effect of dust particles on the properties of plasma sheaths in the presence of a non-uniform magnetic field. A multi-fluid model is used to simulate the dynamics of electrons, ions, and dust particles. The governing equations for all the plasma species are solved numerically using the fourth-order Runge-Kutta (RK4) method. It has been observed that the presence of the dust particles significantly affects the plasma sheath parameters such as potential, electric field, particle density, and particle velocity. The present study is supposed to help in understanding the dynamics of negatively charged dust grains in the sheath. Therefore, the study may be helpful in the plasma processing of materials as well as in plasma-wall interactions for various plasma-aided industrial applications.

• Deka, Kishor; Adhikari, Sayan; Moulick, Rakesh; Kausik, Siddhartha & Saikia, Bipul (2021). Effect of collisions on the plasma sheath in the presence of an inhomogeneous magnetic field. Physica Scripta. ISSN 0031-8949. 96(7). doi: 10.1088/1402-4896/abfc81.
• Paul, Rupali; Sharma, Gunjan; Deka, Kishor; Adhikari, Sayan; Moulick, Rakesh & Kausik, Siddhartha [Show all 7 contributors for this article] (2021). Experimental study of charging of dust grains in the presence of energetic electrons. Plasma Physics and Controlled Fusion. ISSN 0741-3335. doi: 10.1088/1361-6587/ac44e5.
• Bhattacharjee, D.; Buzarbaruah, N.; Mohanty, S.R. & Adhikari, Sayan (2020). Kinetic characteristics of ions in an inertial electrostatic confinement device. Physical review. E. ISSN 2470-0045. 102(6). doi: 10.1103/PhysRevE.102.063205. Full text in Research Archive
• Paul, R.; Adhikari, Sayan; Moulick, R.; Kausik, S. S. & Saikia, B. K. (2020). Magnetized Plasma Sheath in the Presence of Negative Ions. Physics of Plasmas. ISSN 1070-664X. 27(6). doi: 10.1063/5.0004796. Full text in Research Archive
• Sharma, G; Adhikari, Sayan; Moulick, R; Kausik, S. S. & Saikia, B. K. (2020). Effect of two temperature electrons in a collisional magnetized plasma sheath. Physica Scripta. ISSN 0031-8949. 95(3). doi: 10.1088/1402-4896/ab5548.
• Adhikari, Sayan (2019). Sheath formation in collisional, low pressure and magnetized plasma. Physics of Plasmas. ISSN 1070-664X. 26(4). doi: 10.1063/1.5090537.
• Mishra, Rinku; Adhikari, Sayan; Mukherjee, Rupak & Dey, M (2018). Correlation between two non-linear events in a dusty plasma system. Physics of Plasmas. ISSN 1070-664X. 25(12). doi: 10.1063/1.5066427.
• Adhikari, Sayan; Moulick, R & Goswami, K. S. (2018). Ion dynamics in a magnetized source-collector sheath. Physics of Plasmas. ISSN 1070-664X. 25(9). doi: 10.1063/1.5045186.
• Adhikari, Sayan; Moulick, R & Goswami, K. S. (2018). Estimation of the reduction of sputtering for fusion grade materials after disappearance of the Debye sheath. Indian Journal of Physics. ISSN 0973-1458. 92, p. 259–270. doi: 10.1007/s12648-017-1088-x.
• Moulick, R; Adhikari, Sayan & Goswami, K. S. (2017). Criterion of sheath formation in magnetized low pressure plasma. Physics of Plasmas. ISSN 1070-664X. 24(11). doi: 10.1063/1.4994261.
• Adhikari, Sayan; Moulick, R & Goswami, K. S. (2017). A dynamic analysis of the magnetized plasma sheath in a collisionless scenario with ion sources. Physics of Plasmas. ISSN 1070-664X. 24(8). doi: 10.1063/1.4994535.

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• Adhikari, Sayan; Mukherjee, Rupak; Marholm, Sigvald & Miloch, Wojciech Jacek (2021). Development of a Deep Neural Network Model for Spacecraft Charging. Show summary

  A Deep Neural Network (DNN) model using the kinetic Particle-in-Cell (PIC) simulation data for spacecraft charging has been developed. The model will be able to predict the potential structure around the spacecraft based on the system parameters of any given system with certain accuracy. DNN provides an excellent tool where we could leverage deep learning for all machine learning tasks and expect better performance with surplus data availability. The usability of DNN is unlimited if a user can train such a model with physics-based parameters. In recent studies, it has shown promising outcomes in terms of accurate prediction of physical quantities[1-2]. In the present work, we used Tensorflow[3], a deep learning library, to classify the PIC simulation datasets. Using Tensorflow, we have compared the effects of multiple activation functions on classification results and developed a library for a case study. This work shows that integrating DNN into traditional computational methods might be the new beginning of developing next-generation modeling.

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