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On the 'magnetic' nature of electron transport barriers in tokamaks

机译:关于托卡马克中电子传输壁垒的“磁性”性质

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The formation of internal transport barriers in the vicinity of rational magnetic surfaces in tokamaks with braided magnetic fields is studied for a simplified model of the perturbed magnetic field with a broad spatial spectrum and a monotonous shear profile. The island overlap criterion is used to derive a condition for barrier formation. This condition links the amplitude and the spectral width of the perturbation with the shear parameter. Numerical experiments with the MHD Monte-Carlo code E3D, where the problem of plasma heat conductivity is solved in 3D, confirm this formation of transport barriers in the case of a monotonous shear profile. Assuming that experimentally observed electron internal transport barriers are the result of local reduction of electron heat transport due to the magnetic field braiding, the amplitude and spectral width of magnetic perturbations are estimated for the tokamak RTP. [References: 18]
机译:研究了在具有编织磁场的托卡马克中,合理的磁性表面附近内部运输壁垒的形成,以简化的具有宽空间谱和单调剪切轮廓的扰动磁场模型。岛重叠标准用于导出形成障碍的条件。此条件将摄动的振幅和频谱宽度与剪切参数联系在一起。使用MHD蒙特卡罗代码E3D进行的数值实验(在3D中解决了等离子体导热性问题)证实了在单调剪切剖面的情况下这种传输势垒的形成。假设实验观察到的电子内部传输壁垒是由于磁场编织而导致电子传热局部减少的结果,则估算了托卡马克RTP的磁扰动幅度和谱宽。 [参考:18]

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