Particle confinement and the anomalous Doppler instability during combined inductive and lower‐hybrid current drive
作者:
S. C. Luckhardt,
K‐I. Chen,
M. J. Mayberry,
M. Porkolab,
Y. Terumichi,
G. Bekefi,
F. S. McDermott,
R. Rohatgi,
期刊:
Physics of Fluids(00319171)
(AIP Available online 1986)
卷期:
Volume 29,
issue 6
页码: 1985-1993
ISSN:0031-9171
年代: 1986
DOI:10.1063/1.865626
出版商: AIP
数据来源: AIP
摘要:
Increases in average density have been observed during lower‐hybrid current‐drive experiments (LHCD) on the Versator II tokamak [Phys. Rev. Lett.48, 152 (1982)], and on other LHCD experiments where inductive‐Ohmic and lower‐hybrid current drive are combined. In the present experiment it is found that this density increase is the result of an improvement in global particle confinement time &tgr;pin comparison to purely Ohmic discharges with similar plasma parameters. Furthermore, it is found that the improved confinement deteriorates when the anomalous Doppler relaxation instability of the anisotropic high‐energy electron tail becomes unstable during LHCD, and the loss rate of tail electrons increases. However, energetic electron losses alone are at least an order of magnitude too small to explain this deterioration in particle confinement.
点击下载:
PDF
(1208KB)
返 回