Fast-ion transport in qmin >2, high-β steady state scenarios on DIII-D
Abstract
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- qmin 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 βN and the noninductive current drive. However, in scenarios with qmin > 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 βN. In contrast, similar plasmas except with qmin just above 1 have approximately classical fastion transport. Experiments that take qmin > 3 plasmas to higher βP with qmin = 11-12 for testing long pulse operation exhibit regimes of better than expected thermal confinement. Compared to the standard high- qmin scenario the high βP cases have shorter slowing-down time and lower ∇βfast , and this reduces the drive for Alfvénic modes, yielding nearly classical fast-ion transport, high values of normalized confinement, βN, and noninductive current fraction.more »
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- General Atomics, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE)
- OSTI Identifier:
- 1329394
- Alternate Identifier(s):
- OSTI ID: 1228280; OSTI ID: 1258530; OSTI ID: 1356314
- Report Number(s):
- LLNL-JRNL-694459
Journal ID: ISSN 1070-664X
- Grant/Contract Number:
- FC02-04ER54698; AC02-09CH1146; AC05-00OR22725; AC52-07NA27344; FG02-04ER54761; SCG903402
- Resource Type:
- Journal Article: Accepted Manuscript
- Journal Name:
- Physics of Plasmas
- Additional Journal Information:
- Journal Volume: 22; Journal ID: ISSN 1070-664X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 70 PLASMA PHYSICS AND FUSION
Citation Formats
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, and Podesta, Mario. Fast-ion transport in qmin >2, high-β steady state scenarios on DIII-D. United States: N. p., 2015.
Web. doi:10.1063/1.4921152.
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. Fast-ion transport in qmin >2, high-β steady state scenarios on DIII-D. United States. https://doi.org/10.1063/1.4921152
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, and Podesta, Mario. 2015.
"Fast-ion transport in qmin >2, high-β steady state scenarios on DIII-D". United States. https://doi.org/10.1063/1.4921152. https://www.osti.gov/servlets/purl/1329394.
@article{osti_1329394,
title = {Fast-ion transport in qmin >2, high-β steady state scenarios on DIII-D},
author = {Holcomb, Christopher T. and Heidbrink, William W. and Ferron, John R. and Van Zeeland, Michael A. and Garofalo, Andrea M. and Solomon, Wayne M. and Gong, Xianzu and Mueller, Dennis and Grierson, Brian A. and Bass, Eric M. and Collins, Cami S. and Park, Jim M. and Kim, Kyungjin and Luce, Timothy C. and Turco, Francesca and Pace, David C. and Ren, Qilong and Podesta, Mario},
abstractNote = {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- qmin 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 βN and the noninductive current drive. However, in scenarios with qmin > 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 βN. In contrast, similar plasmas except with qmin just above 1 have approximately classical fastion transport. Experiments that take qmin > 3 plasmas to higher βP with qmin = 11-12 for testing long pulse operation exhibit regimes of better than expected thermal confinement. Compared to the standard high- qmin scenario the high βP cases have shorter slowing-down time and lower ∇βfast , and this reduces the drive for Alfvénic modes, yielding nearly classical fast-ion transport, high values of normalized confinement, βN, and noninductive current fraction. These results suggest DIII-D might obtain better performance in lower- q95, high- qmin plasmas using broader neutral beam heating profiles and increased direct electron heating power to lower the drive for Alfvén eigenmodes.},
doi = {10.1063/1.4921152},
url = {https://www.osti.gov/biblio/1329394},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = ,
volume = 22,
place = {United States},
year = {Fri May 22 00:00:00 EDT 2015},
month = {Fri May 22 00:00:00 EDT 2015}
}
Web of Science
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