Overview of the recent research on the J-TEXT tokamak
Overview of the recent research on the J-TEXT tokamak
复制标题
DOI：
10.1088/0029-5515/55/10/104003
复制
发表时间：
2015-03
期刊：
影响因子：
3.3
通讯作者：
G. Zhuang;K. Gentle;P. Diamond;Jie Chen;B. Rao;Li Wang;K. Zhao;Sanghee Han;Yuejiang Shi;Yonghua Ding;Z. Chen;Xi-Wei Hu;Z. J. Wang;Z. Yang;Zhipeng Chen;Z. Cheng;Li Gao;X. Q. Zhang;Ming Zhang;K. Yu;Yuan Pan;H. Huang
中科院分区：
文献类型：
--
作者：
G. Zhuang;K. Gentle;P. Diamond;Jie Chen;B. Rao;Li Wang;K. Zhao;Sanghee Han;Yuejiang Shi;Yonghua Ding;Z. Chen;Xi-Wei Hu;Z. J. Wang;Z. Yang;Zhipeng Chen;Z. Cheng;Li Gao;X. Q. Zhang;Ming Zhang;K. Yu;Yuan Pan;H. Huang
本文总结和介绍了J-TEXT托卡马克两年来的实验研究情况。在J-TEXT平台上研制的高性能偏振干涉仪，时间响应可达1 μs，相位分辨率<0.1°，空间分辨率<3cm，可同时测量电子密度和法拉第角。如此高的分辨率允许调查的快速平衡动力学，以及与磁流体动力学不稳定性相关的磁和密度扰动。粒子输运由于碰撞的粒子进行了分析。锯齿只是部分地使核心密度分布变平，并且在碰撞之间的恢复意味着向内的收缩速度延伸到中心。J-TEXT上的共振磁扰动（RMP）系统可以产生最大旋转频率高达6 kHz的旋转螺旋场扰动，以及m/n = 2/1、3/1或1/1的主共振模式。结果表明，撕裂模可以很容易地被锁定，然后与旋转的RMP一起旋转。利用朗缪尔探针阵列在等离子体边缘研究了射频脉冲对等离子体流动和涨落的影响。当RMP电流不超过5 kA时，环向速度随RMP线圈电流的增大而增大，径向电场随电流的增大而减小。当RMP电流达到6 kA时，环向速度分布在最后一个闭合磁通表面附近变得平坦。测地线声学模式在大部分边缘区域被阻尼，而低频纬向流在岛内部被阻尼，但在其边界处增加。
The experimental research over last two years on the J-TEXT tokamak is summarized and presented in the paper. The high-performance polarimeter-interferometer developed on J-TEXT, aiming to measure electron density and Faraday angle simultaneously, has time response up to 1 µs, phase resolution <0.1° and spatial resolution ∼3 cm. Such high resolution permits investigations of fast equilibrium dynamics as well as magnetic and density perturbations associated with magnetohydrodynamic instabilities. Particle transport due to the sawtooth crashes is analysed. The sawteeth only partially flatten the core density profile and recovery between crashes implies an inward pinch velocity extending to the centre. The resonant magnetic perturbation (RMP) system on J-TEXT can generate a rotating helical field perturbation with a maximum rotation frequency up to 6 kHz, and dominant resonant modes of m/n = 2/1, 3/1 or 1/1. It is found that tearing modes can be easily locked and then rotate together with a rotating RMP. The effects of RMPs on plasma flows and fluctuations are studied with Langmuir probe arrays at the plasma edge. The toroidal velocity increases and the radial electric field decreases with RMP coil current when the RMP current is no more than 5 kA. When the RMP current reaches 6 kA, the toroidal velocity profile becomes flattened near the last closed flux surface. The geodesic acoustic mode is damped in most of the edge region, while the low frequency zonal flow is damped inside the islands, but increases at its boundary.