期刊
PHYSICS OF PLASMAS
卷 16, 期 12, 页码 -出版社
AIP Publishing
DOI: 10.1063/1.3265965
关键词
plasma Alfven waves; plasma diagnostics; plasma instability; plasma simulation; plasma toroidal confinement; plasma transport processes; Tokamak devices
资金
- U.S. DOE [DE-AC02-09CH11466, DE-FG03-99ER54527, DE-FG0206ER54867, DE-FG02-99ER54527]
Experiments on the National Spherical Torus Experiment [M. Ono , Nucl. Fusion 40, 557 (2000)] found strong bursts of toroidal Alfveacuten eigenmode (TAE) activity correlated with abrupt drops in the neutron rate. A fairly complete data set offers the opportunity to benchmark the NOVA [C. Z. Cheng, Phys. Rep. 211, 1 (1992)] and ORBIT [R. B. White and M. S. Chance, Phys. Fluids 27, 2455 (1984)] codes in the low aspect ratio tokamak (ST) geometry. The internal structure of TAE was modeled with NOVA and good agreement is found with measurements made with an array of five fixed-frequency reflectometers. The fast-ion transport resulting from these bursts of multiple TAE was then modeled with the ORBIT code. The simulations are reasonably consistent with the observed drop in neutron rate, however, further refinements in both the simulation of the TAE structure and in the modeling of the fast-ion transport are needed. Benchmarking stability codes against present experiments is an important step in developing the predictive capability needed to plan future experiments.
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