Modeling of the Hα Emission from ADITYA Tokamak Plasmas
by
Ritu Dey 1,*, Malay B. Chowdhuri 1
, Joydeep Ghosh 1,2, Ranjana Manchanda 1, Nandini Yadava 3, Umeshkumar C. Nagora 1,2, Parveen K. Atrey 1, Jayesh V. Raval 1, Y. Shankara Joisa 1, Rakesh L. Tanna 1 and ADITYA Team 1
Ritu Dey 1,*, Malay B. Chowdhuri 1, Joydeep Ghosh 1,2, Ranjana Manchanda 1, Nandini Yadava 3, Umeshkumar C. Nagora 1,2, Parveen K. Atrey 1, Jayesh V. Raval 1, Y. Shankara Joisa 1, Rakesh L. Tanna 1 and ADITYA Team 1
1
Institute for Plasma Research, Bhat, Gandhinagar 382 428, India
2
Homi Bhaba National Institute, Anushakti Nagar, Mumbai 400 094, India
3
The National Institute of Engineering, Mysuru 570 008, Karnataka, India
*
Author to whom correspondence should be addressed.
Atoms 2019, 7(4), 95; https://doi.org/10.3390/atoms7040095
Received: 30 June 2019 / Revised: 16 September 2019 / Accepted: 3 October 2019 / Published: 5 October 2019
(This article belongs to the Special Issue Plasma Spectroscopy in the Presence of Magnetic Fields)
The spatial profile of Hα spectrum is regularly measured using a high-resolution multi-track spectrometer in ADITYA tokamak to study the neutral particle behavior. The Monte Carlo neutral particle transport code DEGAS2 is used to model the experimental Hα spectral emissions. Through the modeling of the spectral line profile of Hα, it is found that the neutral hydrogen, which is produced from molecular hydrogen and molecular hydrogen ion dissociation processes contributes 56% to the total Hα emission, and the atoms which are produced from charge-exchange process have 30% contribution. Furthermore, the experimentally measured spatial profile of chord integrated brightness was modeled for the two plasma discharges having relatively high and low density to understand the neutral particle penetration. The presence of neutrals inside the core region of the ADITYA tokamak is mainly due to the charge-exchange process. Furthermore, it is observed that neutral particle penetration is lower in higher density discharge.
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Keywords:
ADITYA tokamak; Hα spectrum; DEGAS2
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MDPI and ACS Style
Dey, R.; Chowdhuri, M.B.; Ghosh, J.; Manchanda, R.; Yadava, N.; Nagora, U.C.; Atrey, P.K.; Raval, J.V.; Joisa, Y.S.; Tanna, R.L.; ADITYA Team. Modeling of the Hα Emission from ADITYA Tokamak Plasmas. Atoms 2019, 7, 95.
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