The deteriorating effect of plasma density fluctuations on microwave beam quality

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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| openaire: EC/H2020/633053/EU//EUROfusion

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TOKAMAK, WAVES

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10.1051/epjconf/201920301005

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Koehn, A, Austin, M E, Brookman, M W, Gentle, K W, Guidi, L, Holzhauer, E, La Haye, R J, Leddy, J B, Maj, O, Petty, C C, Poli, E, Snicker, A, Thomas, M B, Vann, R G L & Weber, H 2019, The deteriorating effect of plasma density fluctuations on microwave beam quality . in E Poli, H Laqua & J Oosterbeek (eds), 20TH JOINT WORKSHOP ON ELECTRON CYCLOTRON EMISSION AND ELECTRON CYCLOTRON RESONANCE HEATING (EC20) . EPJ Web of Conferences, vol. 203, EDP Sciences, Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, Greifswald, Germany, 14/05/2018 . https://doi.org/10.1051/epjconf/201920301005

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https://urn.fi/URN:NBN:fi:aalto-202010306233

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[article-cris] Perustieteiden korkeakoulu / SCI

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The deteriorating effect of plasma density fluctuations on microwave beam quality

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