Fishbone activity in experimental advanced superconducting tokamak neutral beam injection plasma
Fishbone activity in experimental advanced superconducting tokamak neutral beam injection plasma
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DOI：
10.1063/1.4939020
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发表时间：
2015-12
影响因子：
2.2
通讯作者：
L. Xu;J. Zhang;Kaiyun Chen;Liqun Hu;E. Li;Shiyao Lin;T. Shi;Y. Duan;Yubao Zhu
中科院分区：
文献类型：
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作者：
L. Xu;J. Zhang;Kaiyun Chen;Liqun Hu;E. Li;Shiyao Lin;T. Shi;Y. Duan;Yubao Zhu
在实验性先进超导托卡马克（EAST）托卡马克中，首次在中性束注入高约束等离子体中观察到捕获离子处理频率附近的重复鱼骨，并使用基于紧凑硅光电二极管的固态中性粒子分析仪和升级的高时空分辨率多阵列软x射线（SX）系统进行诊断。这种1/1典型的内部扭结模式在离子抗磁性方向上传播，其旋转速度比等离子体框架中的体等离子体快。从SX测量来看，该模态频率是典型的啁啾下降和与扭模结构相关的高能粒子效应。这种离子鱼骨被发现能够触发具有边缘2/1边带模式的多核锯齿碰撞，以及导致从鱼骨到长寿命饱和扭结模式到鱼骨的过渡。此外，使用SX层析成像，发现了模态振幅和模态频率之间的相关性。最后，建立了一个能很好地再现鱼骨非线性过程的现象学捕食模型。
Repetitive fishbones near the trapped ion procession frequency were observed for the first time in the neutral beam injection high confinement plasmas in Experimental Advanced Superconducting Tokamak (EAST) tokamak, and diagnosed using a solid-state neutral particle analyzer based on a compact silicon photodiode together with an upgraded high spatial-temporal-resolution multi-arrays soft X-ray (SX) system. This 1/1 typical internal kink mode propagates in the ion-diamagnetism direction with a rotation speed faster than the bulk plasma in the plasma frame. From the SX measurements, this mode frequency is typical of chirping down and the energetic particle effect related to the twisting mode structure. This ion fishbone was found able to trigger a multiple core sawtooth crashes with edge-2/1 sideband modes, as well as to lead to a transition from fishbone to long lived saturated kink mode to fishbone. Furthermore, using SX tomography, a correlation between mode amplitude and mode frequency was found. Finally, a phenomenological prey–predator model was found to reproduce the fishbone nonlinear process well.