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Title: Using AORSA to simulate helicon waves in DIII-D

Recent efforts have shown that helicon waves (fast waves at > 20ω{sub ci}) may be an attractive option for driving efficient off-axis current drive during non-inductive tokamak operation for DIII-D, ITER and DEMO. For DIII-D scenarios, the ray tracing code, GENRAY, has been extensively used to study helicon current drive efficiency and location as a function of many plasma parameters. The full wave code, AORSA, which is applicable to arbitrary Larmor radius and can resolve arbitrary ion cyclotron harmonic order, has been recently used to validate the ray tracing technique at these high cyclotron harmonics. If the SOL is ignored, it will be shown that the GENRAY and AORSA calculated current drive profiles are comparable for the envisioned high beta advanced scenarios for DIII-D, where there is high single pass absorption due to electron Landau damping and minimal ion damping. AORSA is also been used to estimate possible SOL effects on helicon current drive coupling and SOL absorption due to collisional and slow wave effects.
Authors:
; ; ; ;  [1] ; ;  [2] ;  [3] ; ;  [4]
  1. Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN (United States)
  2. XCEL Engineering, Inc., 1066 Commerce Park Dr., Oak Ridge, TN (United States)
  3. Princeton Plasma Physics Laboratory, Princeton, NJ (United States)
  4. General Atomics, San Diego, CA (United States)
Publication Date:
OSTI Identifier:
22496222
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1689; Journal Issue: 1; Conference: 21. topical conference on radio frequency power in plasmas, Lake Arrowhead, CA (United States), 27-29 Apr 2015; 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; A CODES; ABSORPTION; CYCLOTRON HARMONICS; DOUBLET-3 DEVICE; ELECTRONS; G CODES; HELICON WAVES; HIGH-BETA PLASMA; ITER TOKAMAK; LANDAU DAMPING; LARMOR RADIUS