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Interaction of tokamak edge electrons with lower hybrid antenna electric field spectra

机译：托卡马克边缘电子与低混合天线电场谱的相互作用

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Fast electrons generated in front of lower hybrid (LH) grills can cause damage to tokamak divertor and first wall components. It is therefore of interest to identify possible edge electron acceleration mechanisms and suggest measures to limit these. One possible acceleration process described here depends on mode overlap in the antenna electric field spectrum and on the presence of high-nit modes, resonant with the ambient (similar to 25 eV) edge electrons. These electrons then diffuse throughout the globally stochastic region of n()-space whose upper bound is given by the last overlapping mode. It is shown that the described acceleration is seriously aggravated by the presence of higher order waveguide modes generated at sharp waveguide-plasma transitions and that rounding-off the waveguide septa can considerably reduce the fields and electron acceleration associated with these higher order modes. Additional antenna field non-uniformities arising from a grill modular structure and random fields generated at the plasma edge through parametric decay and scattering of the LH slow wave from plasma density fluctuations can further enhance the edge electron energy. [References: 14]
机译：在下部混合动力（LH）格栅前面产生的快速电子会损坏托卡马克分流器和第一壁组件。因此，有必要找出可能的边缘电子加速机制并提出限制这些机制的措施。这里描述的一种可能的加速过程取决于天线电场频谱中的模式重叠以及取决于与周围边缘电子（类似于25 eV）共振的高尼特模式的存在。这些电子然后在n（）-空间的全局随机区域中扩散，其上限由最后的重叠模式给出。结果表明，在陡峭的波导-等离子跃迁处产生的高阶波导模的存在会严重加剧上述加速度，而四舍五入的波导间隔可显着减小与这些高阶模相关的电场和电子加速度。由格栅模块化结构引起的其他天线场不均匀性，以及通过参数衰减和等离子体密度波动引起的LH慢波的散射而在等离子体边缘产生的随机场会进一步增强边缘电子能量。 [参考：14]

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