AORSA full wave calculations of helicon waves in DIII-D and ITER

Lau, C.; Jaeger, E. F.; Bertelli, N.; Berry, L. A.; Green, D. L.; Murakami, M.; Park, J. M.; Pinsker, R. I.; Prater, R.

doi:10.1088/1741-4326/aab96d

Title: AORSA full wave calculations of helicon waves in DIII-D and ITER

Journal Article · 11 April 2018 · Nuclear Fusion

DOI: https://doi.org/10.1088/1741-4326/aab96d · OSTI ID:1432839

^[1]; Jaeger, E. F. ^[2]; Bertelli, N. ^[3]; Berry, L. A. ^[2]; Green, D. L. ^[1]; Murakami, M. ^[1]; Park, J. M. ^[1]; Pinsker, R. I. ^[4]; Prater, R. ^[4]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
XCEL Engineering, Inc., Oak Ridge, TN (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)

Helicon waves have been recently proposed as an off-axis current drive actuator for DIII-D, FNSF, and DEMO tokamaks. Previous ray tracing modeling using GENRAY predicts strong single pass absorption and current drive in the mid-radius region on DIII-D in high beta tokamak discharges. The full wave code AORSA, which is valid to all order of Larmor radius and can resolve arbitrary ion cyclotron harmonics, has been used to validate the ray tracing technique. If the scrape-off-layer (SOL) is ignored in the modeling, AORSA agrees with GENRAY in both the amplitude and location of driven current for DIII-D and ITER cases. These models also show that helicon current drive can possibly be an efficient current drive actuator for ITER. Previous GENRAY analysis did not include the SOL. AORSA has also been used to extend the simulations to include the SOL and to estimate possible power losses of helicon waves in the SOL. AORSA calculations show that another mode can propagate in the SOL and lead to significant (~10%–20%) SOL losses at high SOL densities. Optimizing the SOL density profile can reduce these SOL losses to a few percent.

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Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States); General Atomics, San Diego, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE; USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725; AC02-09CH11466; FC02-04ER54698

OSTI ID:: 1432839

Alternate ID(s):: OSTI ID: 1432710; OSTI ID: 1435208

Journal Information:: Nuclear Fusion, Vol. 58, Issue 6; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Title: AORSA full wave calculations of helicon waves in DIII-D and ITER

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