Fast-ion transport in qmin >2, high-β steady state scenarios on DIII-D

Holcomb, Christopher T.; Heidbrink, William W.; Ferron, John R.; Van Zeeland, Michael A.; Garofalo, Andrea M.; Solomon, Wayne M.; Gong, Xianzu; Mueller, Dennis; Grierson, Brian A.; Bass, Eric M.; Collins, Cami S.; Park, Jim M.; Kim, Kyungjin; Luce, Timothy C.; Turco, Francesca; Pace, David C.; Ren, Qilong; Podesta, Mario

doi:10.1063/1.4921152

Title: Fast-ion transport in q_min >2, high-β steady state scenarios on DIII-D

Journal Article · Fri May 22 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4921152· OSTI ID:1329394

Holcomb, Christopher T. ^[1]; Heidbrink, William W. ^[2]; Ferron, John R. ^[3]; Van Zeeland, Michael A. ^[3]; Garofalo, Andrea M. ^[3]; Solomon, Wayne M. ^[4]; Gong, Xianzu ^[5]; Mueller, Dennis ^[4]; Grierson, Brian A. ^[4]; Bass, Eric M. ^[3]; Collins, Cami S. ^[2]; Park, Jim M. ^[6]; Kim, Kyungjin ^[6]; Luce, Timothy C. ^[3]; Turco, Francesca ^[7]; Pace, David C. ^[3]; Ren, Qilong ^[3]; Podesta, Mario ^[4]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Univ. of California, Irvine, CA (United States)
General Atomics, San Diego, CA (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Chinese Academy of Sciences (CAS), Beijing (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Columbia Univ., New York, NY (United States)

Results from experiments on DIII-D [J.L. Luxon, Fusion Sci. Technol. 48, 828 (2005)] aimed at developing high β steady-state operating scenarios with high- q_min confirm that fast-ion transport is a critical issue for advanced tokamak development using neutral beam injection current drive. In DIII-D, greater than 11 megawatts of neutral beam heating power is applied with the intent of maximizing β_N and the noninductive current drive. However, in scenarios with q_min > 2 that target the typical range of q₉₅ = 5-7 used in next-step steady-state reactor models, Alfvén eigenmodes cause greater fast-ion transport than classical models predict. This enhanced transport reduces the absorbed neutral beam heating power and current drive and limits the achievable β_N. In contrast, similar plasmas except with q_min just above 1 have approximately classical fastion transport. Experiments that take qmin > 3 plasmas to higher β_P with q_min = 11-12 for testing long pulse operation exhibit regimes of better than expected thermal confinement. Compared to the standard high- q_min scenario the high β_P cases have shorter slowing-down time and lower ∇β_fast, and this reduces the drive for Alfvénic modes, yielding nearly classical fast-ion transport, high values of normalized confinement, β_N, and noninductive current fraction. These results suggest DIII-D might obtain better performance in lower- q₉₅, high- q_min plasmas using broader neutral beam heating profiles and increased direct electron heating power to lower the drive for Alfvén eigenmodes.

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Research Organization:: General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

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

Grant/Contract Number:: FC02-04ER54698; AC02-09CH1146; AC05-00OR22725; AC52-07NA27344; FG02-04ER54761; SCG903402

OSTI ID:: 1329394

Alternate ID(s):: OSTI ID: 1228280; OSTI ID: 1258530; OSTI ID: 1356314

Report Number(s):: LLNL-JRNL-694459

Journal Information:: Physics of Plasmas, Vol. 22; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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Integrated modeling of high β _N steady state scenario on DIII-D Park, J. M.; Ferron, J. R.; Holcomb, C. T. Physics of Plasmas, Vol. 25, Issue 1 https://doi.org/10.1063/1.5013021	journal	January 2018
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
Integrated Tokamak modeling: When physics informs engineering and research planning Poli, Francesca Maria Physics of Plasmas, Vol. 25, Issue 5 https://doi.org/10.1063/1.5021489	journal	May 2018
Diagnosis of fast ions produced by negative-ion neutral-beam injection with fast-ion deuterium-alpha spectroscopy Muscatello, C. M.; Heidbrink, W. W.; Boivin, R. L. Review of Scientific Instruments, Vol. 90, Issue 7 https://doi.org/10.1063/1.5099491	journal	July 2019
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Feedback control of stored energy and rotation with variable beam energy and perveance on DIII-D Boyer, M. D.; Erickson, K. G.; Grierson, B. A. Nuclear Fusion, Vol. 59, Issue 7 https://doi.org/10.1088/1741-4326/ab17f5	journal	May 2019
Alfvén eigenmodes and fast ion transport in negative triangularity DIII-D plasmas Van Zeeland, M. A.; Collins, C. S.; Heidbrink, W. W. Nuclear Fusion, Vol. 59, Issue 8 https://doi.org/10.1088/1741-4326/ab2488	journal	June 2019
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