Browsing by Author "Snicker, A."

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    Microwave beam broadening due to turbulent plasma density fluctuations within the limit of the Born approximation and beyond
    (2018) Köhn, Alf; Guidi, L.; Holzhauer, Eberhard; Maj, O.; Poli, E.; Snicker, A.; Weber, H.
    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.