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Title: Investigation of neutral particle dynamics in Aditya tokamak plasma with DEGAS2 code

Abstract

Neutral particle behavior in Aditya tokamak, which has a circular poloidal ring limiter at one particular toroidal location, has been investigated using DEGAS2 code. The code is based on the calculation using Monte Carlo algorithms and is mainly used in tokamaks with divertor configuration. This code has been successfully implemented in Aditya tokamak with limiter configuration. The penetration of neutral hydrogen atom is studied with various atomic and molecular contributions and it is found that the maximum contribution comes from the dissociation processes. For the same, H α spectrum is also simulated which was matched with the experimental one. The dominant contribution around 64% comes from molecular dissociation processes and neutral particle is generated by those processes have energy of ~ 2.0 eV. Furthermore, the variation of neutral hydrogen density and H α emissivity profile are analysed for various edge temperature profiles and found that there is not much changes in H α emission at the plasma edge with the variation of edge temperature (7 to 40 eV).

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Inst. for Plasma Research, Gandhinagar, Gujarat (India)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
Contributing Org.:
Aditya Team
OSTI Identifier:
1373089
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nuclear Fusion
Additional Journal Information:
Journal Volume: 57; Journal Issue: 8; Journal ID: ISSN 0029-5515
Publisher:
IOP Science
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; neutral particle; atomic and molecular processes; Aditya; DEGAS2;

Citation Formats

Dey, Ritu, Ghosh, Joydeep, Chowdhuri, M. B., Manchanda, R., Banerjee, S., Ramaiya, N., Sharma, Deepti, Srinivasan, R., and Stotler, D. P. Investigation of neutral particle dynamics in Aditya tokamak plasma with DEGAS2 code. United States: N. p., 2017. Web. doi:10.1088/1741-4326/aa739c.
Dey, Ritu, Ghosh, Joydeep, Chowdhuri, M. B., Manchanda, R., Banerjee, S., Ramaiya, N., Sharma, Deepti, Srinivasan, R., & Stotler, D. P. Investigation of neutral particle dynamics in Aditya tokamak plasma with DEGAS2 code. United States. doi:10.1088/1741-4326/aa739c.
Dey, Ritu, Ghosh, Joydeep, Chowdhuri, M. B., Manchanda, R., Banerjee, S., Ramaiya, N., Sharma, Deepti, Srinivasan, R., and Stotler, D. P. Fri . "Investigation of neutral particle dynamics in Aditya tokamak plasma with DEGAS2 code". United States. doi:10.1088/1741-4326/aa739c. https://www.osti.gov/servlets/purl/1373089.
@article{osti_1373089,
title = {Investigation of neutral particle dynamics in Aditya tokamak plasma with DEGAS2 code},
author = {Dey, Ritu and Ghosh, Joydeep and Chowdhuri, M. B. and Manchanda, R. and Banerjee, S. and Ramaiya, N. and Sharma, Deepti and Srinivasan, R. and Stotler, D. P.},
abstractNote = {Neutral particle behavior in Aditya tokamak, which has a circular poloidal ring limiter at one particular toroidal location, has been investigated using DEGAS2 code. The code is based on the calculation using Monte Carlo algorithms and is mainly used in tokamaks with divertor configuration. This code has been successfully implemented in Aditya tokamak with limiter configuration. The penetration of neutral hydrogen atom is studied with various atomic and molecular contributions and it is found that the maximum contribution comes from the dissociation processes. For the same, Hα spectrum is also simulated which was matched with the experimental one. The dominant contribution around 64% comes from molecular dissociation processes and neutral particle is generated by those processes have energy of ~ 2.0 eV. Furthermore, the variation of neutral hydrogen density and Hα emissivity profile are analysed for various edge temperature profiles and found that there is not much changes in Hα emission at the plasma edge with the variation of edge temperature (7 to 40 eV).},
doi = {10.1088/1741-4326/aa739c},
journal = {Nuclear Fusion},
number = 8,
volume = 57,
place = {United States},
year = {Fri Jun 09 00:00:00 EDT 2017},
month = {Fri Jun 09 00:00:00 EDT 2017}
}

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