Plasma Response to Supersonic Molecular Beam Injection in J-TEXT
Plasma Response to Supersonic Molecular Beam Injection in J-TEXT
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DOI：
10.1088/1009-0630/16/1/04
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发表时间：
2014
影响因子：
1.7
通讯作者：
J. Xiao;Z. Yang;G. Zhuang;Q. Hu;Xiande Feng;Minghai Liu
中科院分区：
文献类型：
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作者：
J. Xiao;Z. Yang;G. Zhuang;Q. Hu;Xiande Feng;Minghai Liu
最近，在J-TEXT托卡马克上进行了超音速分子束注入(SMBI)系统的氢燃料实验。为了评价SMBI注入量对等离子体行为的影响，分别对中等注入量和高注入量的SMB进行了欧姆放电比较。用高分辨率能谱仪(碳V离子，227.09 nm，r/a=0.7~0.8)测得的沿逆流方向的边缘环旋转速度从8公里/S加速到12公里/S，电子密度增加约一倍，磁岛尺寸略有减小，表明等离子体约束得到改善。然而，随着SMB强度的增大，伴随的磁流体(MHD)活动被触发，电子密度适度增加。边缘环向速度降低，在某些情况下，甚至在并流方向上相反。对中强度SMB的实验数据进行了统计分析，得出了提高SMBI加注效率的最佳加油量(小于3.2×1019)。
Recently, hydrogen fueling experiments with supersonic molecular beam injection (SMBI) system have been performed in the J-TEXT tokamak. To evaluate the effects of the injection amount of SMBI on plasma behaviors, moderate and intensive SMBs have been separately injected and compared with each other in Ohmic discharges. With moderate SMBs, electron density increases about twice as before, the size of magnetic island slightly decreases, and the edge toroidal rotation speed in a counter-current direction, measured by a high resolution spectrometer (Carbon V ion, 227.09 nm, r/a = 0.7–0.8), is accelerated from 8 km/s to 12 km/s. The state of higher electron density with moderate SMBI can be maintained for a long period, which indicates that plasma confinement is improved. However, with intensive SMBs, the accompanied magnetohydrodynamic (MHD) activities are triggered, and the electron density increases moderately. The edge toroidal velocity is decreased, in certain cases even reversed in the co-current direction. The statistical result of experimental data for moderate and intensive SMBs suggests a preferred fueling amount (less than 3.2×1019) to improve the SMBI fueling efficiency in experiments.