The behavior of runaway current in massive gas injection fast shutdown plasmas in J-TEXT
The behavior of runaway current in massive gas injection fast shutdown plasmas in J-TEXT
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J-TEXT 中大量气体注入快速关断等离子体中失控电流的行为
DOI：
10.1088/0029-5515/56/11/112013
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发表时间：
2016-07
期刊：
影响因子：
--
通讯作者：
Z.H. Jiang
中科院分区：
文献类型：
--
作者：
Z.Y. Chen;D.W. Huang;Y.H. Luo;Y. Tang;Y.B. Dong;L. Zeng;R.H. Tong;S.Y. Wang;Y.N. Wei;X.H. Wang;J.C. Li;X.Q. Zhang;B. Rao;W.Yan;X. Jian;T.K. Ma;Q.M. Hu;Z.J. Yang;L. Gao;Y.H. Ding;Z.J. Wang;M. Zhang;G. Zhuang;Y. Pan;Z.H. Jiang
中断后的失控电流对当前托卡马克的第一壁有重要影响，在下一代托卡马克中将更加严重。在J-TEXT托卡马克上研究了大量气体注入(MGI)引起的破裂中逃逸电流的行为。由气体急流诱导的冷锋沿场线螺旋穿透，优先向高场侧移动，并在破裂前停在Q = 2表面附近。当冷锋到达Q = 2表面时，它启动了磁流体力学活动，并导致了分裂。研究发现，He或Ne的MGI在大范围的气体注入中会导致失控自由停堆。混合注入He和Ar(90%He和10%Ar)始终导致失控自由停堆。适量的Ar注入可能会产生显著的失控电流。利用一个忽略阻力和其他能量损失机制的简化模型估算了失控高原的最大失控能量。最大失控能量随失控电流的减小而增大。在失控电流平台期间，使用软X射线阵列对失控光束进行成像表明，失控光束位于等离子体的中心。在一台小型托卡马克J-TEXT装置上，利用共振磁微扰(RMP)成功地降低了破裂阶段的失控电流。当失控电流增加时，由于高能失控电子对磁扰动的敏感性较低，RMP的应用不能使失控束流去耦合。
Runaway currents following disruptions have an important effect on the first wall in current tokamaks and will be more severe in next generation tokamaks. The behavior of runaway currents in massive gas injection (MGI) induced disruptions have been investigated in the J-TEXT tokamak. The cold front induced by the gas jet penetrates helically along field lines, preferentially toward the high field side and stops at a location near the q = 2 surface before the disruption. When the cold front reaches the q = 2 surface it initiates magnetohydrodynamic activities and results in disruption. It is found that the MGI of He or Ne results in runaway free shutdown in a large range of gas injections. Mixture injection of He and Ar (90% He and 10%Ar) consistently results in runaway free shutdown. A moderate amount of Ar injection could produce significant runaway current. The maximum runaway energy in the runaway plateau is estimated using a simplified model which neglects the drag forces and other energy loss mechanisms. The maximum runaway energy increases with decreasing runaway current. Imaging of the runaway beam using a soft x-ray array during the runaway current plateau indicates that the runaway beam is located in the center of the plasma. Resonant magnetic perturbation (RMP) is applied to reduce the runaway current successfully during the disruption phase in a small scale tokamak, J-TEXT. When the runaway current builds up, the application of RMP cannot decouple the runaway beam due to the lower sensitivity of the energetic runaway electrons to the magnetic perturbation.
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影响因子：
8.6
作者：
J. R. Martin-Solis;B. Esposito;R. Sánchez;F. Poli;L. Panaccione
通讯作者：
J. R. Martin-Solis;B. Esposito;R. Sánchez;F. Poli;L. Panaccione
影响因子：
2.2
作者：
Håkan Smith;E. Verwichte
通讯作者：
Håkan Smith;E. Verwichte
影响因子：
3.3
作者：
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通讯作者：
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影响因子：
2.2
作者：
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通讯作者：
S. Putvinski;P. Barabaschi;N. Fujisawa;N. Putvinskaya;M. Rosenbluth;J. Wesley
影响因子：
3.3
作者：
G. Pautasso;C. Fuchs;O. Gruber;C. Maggi;M. Maraschek;T. Pütterich;V. Rohde;C. Wittmann;E. Wo
通讯作者：
G. Pautasso;C. Fuchs;O. Gruber;C. Maggi;M. Maraschek;T. Pütterich;V. Rohde;C. Wittmann;E. Wo