Effects of MHD instabilities on neutral beam current drive

Podestà, M.; Gorelenkova, M.; Darrow, D. S.; Fredrickson, E. D.; Gerhardt, S. P.; White, R. B.

doi:10.1088/0029-5515/55/5/053018

Title: Effects of MHD instabilities on neutral beam current drive

Journal Article · Fri Apr 17 00:00:00 EDT 2015 · Nuclear Fusion

DOI:https://doi.org/10.1088/0029-5515/55/5/053018· OSTI ID:1257708

^[1]; Gorelenkova, M. ^[1]; Darrow, D. S. ^[1]; Fredrickson, E. D. ^[1]; Gerhardt, S. P. ^[1];

^[1]

Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

One of the primary tools foreseen for heating, current drive (CD) and q-profile control in future fusion reactors such as ITER and a Fusion Nuclear Science Facility is the neutral beam injection (NBI). However, fast ions from NBI may also provide the drive for energetic particle-driven instabilities (e.g. Alfvénic modes (AEs)), which in turn redistribute fast ions in both space and energy, thus hampering the control capabilities and overall efficiency of NB-driven current. Based on experiments on the NSTX tokamak (M. Ono et al 2000 Nucl. Fusion 40 557), the effects of AEs and other low-frequency magneto-hydrodynamic instabilities on NB-CD efficiency are investigated. When looking at the new fast ion transport model, which accounts for particle transport in phase space as required for resonant AE perturbations, is utilized to obtain consistent simulations of NB-CD through the tokamak transport code TRANSP. It is found that instabilities do indeed reduce the NB-driven current density over most of the plasma radius by up to ~50%. Moreover, the details of the current profile evolution are sensitive to the specific model used to mimic the interaction between NB ions and instabilities. Finally, implications for fast ion transport modeling in integrated tokamak simulations are briefly discussed.

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Research Organization:: Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466

OSTI ID:: 1257708

Report Number(s):: PPPL-5094

Journal Information:: Nuclear Fusion, Vol. 55, Issue 5; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Cited By (5)

Dynamic neutral beam current and voltage control to improve beam efficacy in tokamaks Austin, M. E.; Bardoczi, L.; Collins, C. S. Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5016160	journal	May 2018
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The phase-space dependence of fast-ion interaction with tearing modes Heidbrink, W. W.; Bardoczi, L.; Collins, C. S. Nuclear Fusion, Vol. 58, Issue 8 https://doi.org/10.1088/1741-4326/aab7b6	journal	July 2018
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