Toroidal plasma current startup and sustainment by lower hybrid waves in the WT-3 tokamak
Toroidal plasma current startup and sustainment by lower hybrid waves in the WT-3 tokamak
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WT-3 托卡马克中较低混合波的环形等离子体电流启动和维持
DOI：
10.1088/0029-5515/30/4/003
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发表时间：
1990
期刊：
影响因子：
3.3
通讯作者：
Shiro Tanaka
中科院分区：
文献类型：
--
作者：
K. Ogura;Hitoshi Tanaka;Shunsuke Ide;M. Iida;Kazuaki Hanada;Minoru Yoshida;Takashi Minami;M. Nakamura;T. Maekawa;Y. Terumichi;Shiro Tanaka
在WT-3中，以电子回旋共振频率将较低的混合波注入微波放电中，以启动环形等离子体电流IP，并通过射频（RF）功率单独维持它，而不需要欧姆加热功率（这被称为“RF托卡马克”）。首先，利用电子回旋加速器和较低的混合功率产生几千电子伏特范围内的快速电子，产生微弱的环形等离子体电流。然后，较低的混合波产生100 keV以上的快速电子，IP迅速增加（ΔIp/Δt ~ 780 kA·s−1）至近13 kA。随后，环形等离子体电流缓慢上升（ΔIp/Δt ~ 180 kA·s−1），在低密度（n´e < 6 × 1018 m−3）时达到bb0 25 kA。注入的低混合功率部分∈R（≤8%）转换为极向磁场能。对于高密度（n ^ e =(6−12)× 1018 m−3），在IP = 7 ~ 20 kA时获得准稳态放电，其优点ηCD值约为0.05 × 1019 a·m−2·W−1。∈R和ηCD的实验值可以用快电子的直接损失来解释。
In WT-3, lower hybrid waves are injected into a microwave discharge at the electron cyclotron resonance frequency to initiate the toroidal plasma current IP and to sustain it by radiofrequency (RF) power alone without Ohmic heating power (this is called the ‘RF tokamak’). First, fast electrons in the range of several kilo-electronvolts are generated by electron cyclotron and lower hybrid power which initiate a weak toroidal plasma current. Then, fast electrons above 100 keV are produced by the lower hybrid waves, and IP increases rapidly (ΔIp/Δt ∼ 780 kA·s−1) to almost 13 kA. Subsequently the toroidal plasma current is ramped up slowly (ΔIp/Δt ∼ 180 kA·s−1) to > 25 kA for low densities (n̄e < 6 × 1018 m−3). The fraction ∈R (≤8%) of injected lower hybrid power is converted into poloidal magnetic field energy. For high densities (n̄e = (6−12) × 1018 m−3), a quasi-steady-state discharge is obtained with IP = 7−20 kA, and the figure of merit ηCD is about 0.05 × 1019 A·m−2·W−1. The experimental values of ∈R and ηCD are explained by the direct loss of fast electrons.
影响因子：
3.3
作者：
A. Gibson;T. Sekiguchi;K. Lackner;S. Bodner;R. Hancox
通讯作者：
A. Gibson;T. Sekiguchi;K. Lackner;S. Bodner;R. Hancox