The deteriorating effect of plasma density ﬂuctuations on microwave beam quality
Institute of Interfacial Process Engineering and Plasma Technology, University of Stuttgart , Stuttgart Germany
2 Max Planck Institute for Plasma Physics Garching Germany
3 Institute for Fusion Studies, University of Texas at Austin , TX USA
4 General Atomics PO Box 85608, San Diego CA USA
5 York Plasma Insitute, Department of Physics, University of York, York U.K
6 Department of Applied Physics, Aalto University , Aalto Finland
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Published online: 25 March 2019
Turbulent plasma edge density ﬂuctuations can broaden a traversing microwave beam degrading its quality. This can be a problem for scenarios relying on a high spatial localization of the deposition of injected microwave power, like controlling MHD instabilities. Here we present numerical estimations of the scattering of a microwave beam by density ﬂuctuations over a large parameter range, including extrapolations to ITER. Two codes are used, the full-wave code IPF-FDMC and the wave kinetic equation solver WKBeam. A successful comparison between beam broadening obtained from DIII-D experiments and corresponding full-wave simulations is shown.
© The Authors, published by EDP Sciences, 2019
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