Electron cyclotron current drive in a lower hybrid current drive plasma

被引：22
|
作者：
Maehara, T [1 ]
Yoshimura, S
Minami, T
Hanada, K
Nakamura, M
Maekawa, T
Terumichi, Y
机构：
[1] Kyoto Univ, Fac Sci, Dept Phys, Kyoto 606, Japan
[2] Ehime Univ, Dept Phys, Fac Sci, Matsuyama, Ehime 790, Japan
[3] Osaka Inst Technol, Osaka 535, Japan
[4] Kyoto Univ, Grad Sch Engn Sci, Kyoto, Japan
[5] Natl Inst Fus Sci, Toki, Japan
来源：
NUCLEAR FUSION | 1998年 / 38卷 / 01期
关键词：
D O I：
10.1088/0029-5515/38/1/304
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
Electron cyclotron (EC) current drive experiments were carried out in lower hybrid current drive (LHCD) plasmas on the WT-3 tokamak. Using oblique injection of EC waves, plasma current is ramped up in a frequency range omega/Omega(e) similar or equal to 1.2-1.4, where Omega(e) is the EC frequency at the plasma centre. This ramp-up is ascribed to selective EC heating of fast electrons in LHCD plasmas via the fundamental EC resonance at the upshifted frequency due to the Doppler effect. Fast electron momentum distributions are estimated from bremsstrahlung hard X ray spectra. These distributions indicate that the parallel momentum input to the fast electrons in the relativistic energy range from oblique EC waves is effective for efficient EC current drive. Current ramp-up is also observed in the second harmonic frequency range omega/Omega(e) similar or equal to 1.9-2.2 In this case, bulk electrons are heated as well as fast electrons and no definite cause of current ramp-up is clarified.
引用
收藏
页码：39 / 57
页数：19
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