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Microwave beam broadening due to turbulent plasma density fluctuations within the limit of the Born approximation and beyond

机译:由于出生的近似值和超出范围内的湍流等离子体密度波动而导致微波束扩大

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摘要

Plasma turbulence, and edge density fluctuations in particular, can under certain conditions broaden the cross-section of injected microwave beams significantly. This can be a severe problem for applications relying on well-localized deposition of the microwave power, like the control of MHD instabilities. Here we investigate this broadening mechanism as a function of fluctuation level, background density and propagation length in a fusion-relevant scenario using two numerical codes, the full-wave code IPF-FDMC and the novel wave kinetic equation solver WKBeam. The latter treats the effects of fluctuations using a statistical approach, based on an iterative solution of the scattering problem (Born approximation). The full-wave simulations are used to benchmark this approach. The Born approximation is shown to be valid over a large parameter range, including ITER-relevant scenarios.
机译:等离子体湍流,特别是边缘密度波动,在某些条件下可以显着拓宽注入微波束的横截面。 这可能是依赖于微波功率良好沉积的应用的严重问题,如MHD稳定性的控制。 在这里,我们将这种拓宽机制调查了使用两个数值代码,全波代码IPF-FDMC和新型波动力学方程求解器WKBEAM在融合水平,背景密度和传播长度中的变波级,背景密度和传播长度的函数。 基于散射问题(出生近似)的迭代解决方案,后者使用统计方法对波动的影响进行处理。 全波模拟用于基准测试此方法。 出生的近似值显示在大参数范围内有效,包括迭代相关方案。

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