Generation of initial closed flux surfaces by ECH at a conventional aspect ratio of R/a~ 3 : experiments on the LATE device and JT-60U tokamak
Generation of initial closed flux surfaces by ECH at a conventional aspect ratio of R/a~ 3 : experiments on the LATE device and JT-60U tokamak
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ECH 在常规纵横比 R/a~ 3 下生成初始闭合通量表面：LATE 装置和 JT-60U 托卡马克上的实验
DOI：
10.1088/0029-5515/51/6/063031
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
S. Nishi
中科院分区：
文献类型：
--
作者：
M. Uchida;T. Maekawa;H. Tanaka;S. Ide;Y. Takase;F. Watanabe;S. Nishi
在低长径比环形实验装置上研究了在常规长径比为R/a = 3的情况下，利用电子回旋加热（ECH）产生初始闭合通量面的方法，并在日本原子能研究所托卡马克60升级装置（JT-60 U）上进行了进一步的实验。在这两个实验中，等离子体电流的启动和增加的ECH下稳定的外场组成的一个环形场和弱垂直场。在LATE实验中，可移动的内侧限制器被用来改变等离子体的纵横比高达R/a = 3。结果表明，在R/a ≤ 3时仍有可能形成闭合的通量面，但随着纵横比的增大，需要更高的垂直场衰减指数。在JT-60 U上进行类似的电流启动放电，并且在具有高衰减指数的垂直场下启动等离子体电流并将其增加到20 kA。
Generation of initial closed flux surfaces by electron cyclotron heating (ECH) at a conventional aspect ratio of R/a∼ 3 is investigated on the Low Aspect ratio Torus Experiment (LATE) device and further tested on the Japan Atomic Energy Research Institute Tokamak-60 Upgrade (JT-60U) tokamak. In both experiments, a plasma current is initiated and increased by ECH under steady external fields composed of a toroidal field and a weak vertical field. In the LATE experiments, a movable inboard limiter is used to change the aspect ratio of plasmas up to R/a∼ 3. The results show that the formation of closed flux surfaces is still possible up to R/a∼ 3 while higher decay indices of vertical field are required as the aspect ratio increases. Similar current start-up discharges are performed on JT-60U, and a plasma current is initiated and increased up to 20 kA under a vertical field having a high decay index.