Köhn, AlfGuidi, L.Holzhauer, EberhardMaj, O.Poli, E.Snicker, A.Weber, H.2024-12-072024-12-0720181361-65870741-3335191405332Xhttp://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-154151http://elib.uni-stuttgart.de/handle/11682/15415http://dx.doi.org/10.18419/opus-15396Plasma 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.eninfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/3.0/670article2023-11-14