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Title: Role of neutral gas in scrape-off layer tokamak plasma

Neutral gas in scrape-off layer of tokamak plasma plays an important role as it can modify the plasma turbulence. In order to investigate this, we have derived a simple two-dimensional (2D) model that consists of electron continuity, quasi-neutrality, and neutral gas continuity equations using neutral gas ionization and charge exchange processes. Simple 1D profile analysis predicts neutral penetration depth into the plasma. Growth rate obtained from the linear theory has been presented. The 2D model equations have been solved numerically. It is found that the neutral gas reduces plasma fluctuations and shifts spectrum of the turbulence towards lower frequency side. The neutral gas fluctuation levels have been presented. The numerical results have been compared with Aditya tokamak experiments.
Authors:
; ;  [1]
  1. Institute for Plasma Research, Bhat, Gandhinagar, Gujarat 382428 (India)
Publication Date:
OSTI Identifier:
22408112
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ADITYA TOKAMAK; CHARGE EXCHANGE; CONTINUITY EQUATIONS; ELECTRONS; FLUCTUATIONS; IONIZATION; PENETRATION DEPTH; PLASMA; PLASMA SCRAPE-OFF LAYER; SPECTRA; TURBULENCE; TWO-DIMENSIONAL CALCULATIONS