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用高灵敏、高时空分辨的软X图象反演系统研究了HT-6B TOKAMAK装置中3个运行区的磁面结构,形成锯齿放电的必要条件之一是在中心区出现有效的加热作用,锯齿区存在5个发展阶段,出现同心、偏心、双心、“MHD型”和“超MHD型”5种磁面结构,MHD振荡区有稳定的“MHD型”磁岛结构,它由弯月形“热芯”和圆形“冷泡”组成,并沿电子逆磁方向旋转,共振区中共振螺旋场改善了加热状况,抑制了MHD扰动,使单一“MHD型”磁面转变为锯齿型磁面。
The magnetic field structure of three operating zones in the HT-6B TOKAMAK device is studied with a highly sensitive and time-space-resolved soft-X image inversion system. One of the necessary conditions for forming a zigzag discharge is the effective heating in the central region, There are five stages of development in the serrated area. Five kinds of magnetic surface structures of concentric, eccentric, bi-heart, “MHD” and “super MHD” appear. The MHD oscillating area has a stable “MHD” magnetic island structure. Shaped “hot core” and a round “cold bubble”, and rotates along the direction of the electron counter-magnetism. The resonance spiral field in the resonance region improves the heating condition, restrain the MHD perturbation, and transform a single “MHD type” magnetic face into a zigzag type Magnetic surface.