The deteriorating effect of plasma density fluctuations on microwave beam quality
- Köhn, Alf
- Austin, Max E.
- Brookman, Michael W.
- Gentle, Kenneth W.
- Guidi, Lorenzo
- Holzhauer, Eberhard
- Haye, Rob J. La
- Leddy, Jarrod B.
- Maj, Omar
- Petty, Craig C.
- Poli, Emanuele
- Rhodes, Terry L.
- Snicker, Antti
- Thomas, Matthew B.
- Vann, Roddy G. L.
- Weber, Hannes
DOIAbstract
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
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