Up-shifted frequency electron-cyclotron current drive in a lower hybrid current drive plasma.
Up-shifted frequency electron-cyclotron current drive in a lower hybrid current drive plasma.
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DOI：
10.1088/0029-5515/38/1/304
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发表时间：
1993
影响因子：
8.6
通讯作者：
Maekawa;Maehara;Minami;Kishigami;Kishino;Makino;Hanada;Nakamura;Terumichi;Tanaka
中科院分区：
文献类型：
--
作者：
Maekawa;Maehara;Minami;Kishigami;Kishino;Makino;Hanada;Nakamura;Terumichi;Tanaka
在WT-3托卡马克上进行了低杂波电流驱动等离子体中的电子回旋（EC）电流驱动实验。使用EC波的倾斜注入，等离子体电流在ω/Ωe 1.2-1.4的频率范围内斜升，其中Ωe是等离子体中心处的EC频率。这种斜升归因于选择性EC加热LHCD等离子体中的快电子通过基本EC共振在上移的频率，由于多普勒效应。根据韧致辐射硬X射线谱估算了快电子动量分布。这些分布表明，平行动量输入到相对论能量范围内的快电子从倾斜EC波是有效的有效EC电流驱动。在二次谐波频率ω/ Ωe 1.9-2.2范围内也观察到电流斜升。在这种情况下，体电子被加热，以及快速电子和没有明确的原因，电流斜升澄清。
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 ω/Ωe 1.2-1.4, where Ωe 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 ω/ Ωe 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.