Gradients of electron temperature and density across m = 2 magnetic islands in RTP
Gradients of electron temperature and density across m = 2 magnetic islands in RTP
复制标题
RTP 中 m = 2 个磁岛的电子温度和密度梯度
DOI：
10.1088/0029-5515/33/8/i03
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发表时间：
1993
期刊：
影响因子：
3.3
通讯作者：
M. Verreck
中科院分区：
文献类型：
--
作者：
B. Milligen;A. Lammeren;N. Cardozo;F. C. Schüller;M. Verreck
同时测量了Rijnhuizen托卡马克RTP中的电子温度、电子密度和极向磁场的振荡，以获得对MHD模式扰动结构的深入了解。所使用的诊断仪是一个20通道外差ECE辐射计，一个19通道FIR干涉仪和一组磁拾取线圈。详细分析了扰动前的m/n=2/1岛。虽然密度和温度在O点明显低于X点，但没有局部最小值甚至平坦化。岛屿上的梯度可以理解为岛屿内部有很长的连接长度，再加上等离子体外部区域的高碰撞作用使得沿场线的平均自由程相对较短。讨论了岛内输运和X点和O点径向热通量的极向分布
Simultaneous measurements of oscillations of the electron temperature, the electron density and the poloidal magnetic field in the Rijnhuizen tokamak RTP are combined to obtain an insight into the structure of MHD mode perturbations. The diagnostics used are a 20 channel heterodyne ECE radiometer, a 19 channel FIR interferometer and a set of magnetic pick-up coils. An m/n=2/1 island preceding a disruption is analysed in detail. Whereas the density and temperature are significantly lower in the O point than in the X point, no local minimum or even flattening of the profiles could be demonstrated. The gradients across the island may be understood in terms of a very long connection length inside the island, in combination with the relatively short mean free path along the field lines due to the high collisionality in the outer region of the plasma. The transport inside the island and the poloidal distribution of the radial heat flux over the X and O points are discussed