Compatibility of internal transport barrier with steady-state operation in the high bootstrap fraction regime on DIII-D

Garofalo, Andrea M.; Gong, Xianzu; Grierson, Brian A.; Ren, Qilong; Solomon, Wayne M.; Strait, Edward J.; Van Zeeland, Michael A.; Holcomb, Christopher T.; Meneghini, Orso; Smith, Sterling P.; Staebler, Gary M.; Wan, Baonian; Bravenec, Ronald; Budny, Robert V.; Ding, Siye; Hanson, Jeremy M.; Heidbrink, William W.; Lao, Lang L.; Li, Guoqiang; Pan, Chengkang; Petty, Craig C.; Qian, Jingping; Paz-Soldan, Carlos; Xu, Guosheng

doi:10.1088/0029-5515/55/12/123025

Title: Compatibility of internal transport barrier with steady-state operation in the high bootstrap fraction regime on DIII-D

Journal Article · 16 November 2015 · Nuclear Fusion

DOI: https://doi.org/10.1088/0029-5515/55/12/123025 · OSTI ID:1353118

Garofalo, Andrea M. ^[1]; Gong, Xianzu ^[2]; Grierson, Brian A. ^[3]; Ren, Qilong ^[2]; Solomon, Wayne M. ^[3]; Strait, Edward J. ^[4]; Van Zeeland, Michael A. ^[4]; Holcomb, Christopher T. ^[5]; Meneghini, Orso ^[4]; Smith, Sterling P. ^[4]; Staebler, Gary M. ^[4]; Wan, Baonian ^[2]; Bravenec, Ronald ^[6]; Budny, Robert V. ^[3]; Ding, Siye ^[2]; Hanson, Jeremy M. ^[7]; Heidbrink, William W. ^[8]; Lao, Lang L. ^[4]; Li, Guoqiang ^[2]; Pan, Chengkang ^[2] more »

General Atomics, San Diego, CA (United States); General Atomics
Institute of Plasma Physics Chines Academy of Sciences, Anhui (People's Republic of China)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
General Atomics, San Diego, CA (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Fourth State Research, Austin, TX (United States)
Columbia Univ., New York, NY (United States)
Univ. of California, Irvine, CA (United States)

Recent EAST/DIII-D joint experiments on the high poloidal beta tokamak regime in DIII-D have demonstrated fully noninductive operation with an internal transport barrier (ITB) at large minor radius, at normalized fusion performance increased by ≥30% relative to earlier work. The advancement was enabled by improved understanding of the “relaxation oscillations”, previously attributed to repetitive ITB collapses, and of the fast ion behavior in this regime. It was found that the “relaxation oscillations” are coupled core-edge modes 2 amenable to wall-stabilization, and that fast ion losses which previously dictated a large plasma-wall separation to avoid wall over-heating, can be reduced to classical levels with sufficient plasma density. By using optimized waveforms of the plasma-wall separation and plasma density, fully noninductive plasmas have been sustained for long durations with excellent energy confinement quality, bootstrap fraction ≥ 80%, β_N ≤ 4 , β_P ≥ 3 , and β_T ≥ 2%. Finally, these results bolster the applicability of the high poloidal beta tokamak regime toward the realization of a steady-state fusion reactor.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E)

Grant/Contract Number:: FC02-04ER54698

OSTI ID:: 1353118

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 12 Vol. 55; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Compatibility of internal transport barrier with steady-state operation in the high bootstrap fraction regime on DIII-D

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