Using AORSA to simulate helicon waves in DIII-D

Conference · Wed Apr 01 00:00:00 EDT 2015

DOI:https://doi.org/10.1063/1.4936534· OSTI ID:1263867

Lau, Cornwall  ^[1]; Jaeger, E. F. ^[2]; Bertelli, Nicola ^[3]; Berry, Lee Alan ^[2]; Blazevski, Daniel ^[1]; Green, David  ^[1]; Murakami, Masanori  ^[1]; Park, J. M. ^[4]; Pinsker, R. I. ^[5]; Prater, R. ^[6]

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1. ORNL
2. XCEL Engineering Inc., Oak Ridge
3. Princeton Plasma Physics Laboratory (PPPL)
4. Oak Ridge National Laboratory (ORNL)
5. General Atomics, San Diego
6. General Atomics

Recent efforts have shown that helicon waves (fast waves at >20 omega(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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1263867
• Resource Relation: Journal Volume: 1689; Conference: Radio Frequency Power in Plasma - Lakewood, California, United States of America - 4/27/2015 12:00:00 AM-4/29/2015 12:00:00 AM
• Country of Publication: United States
• Language: English