The deteriorating effect of plasma density fluctuations on microwave beam quality

Alf Koehn*, Max E. Austin, Michael W. Brookman, Kenneth W. Gentle, Lorenzo Guidi, Eberhard Holzhauer, Rob J. La Haye, Jarrod B. Leddy, Omar Maj, Craig C. Petty, Emanuele Poli, Antti Snicker, Matthew B. Thomas, Roddy G. L. Vann, Hannes Weber

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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Abstract

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.

Original languageEnglish
Title of host publication20TH JOINT WORKSHOP ON ELECTRON CYCLOTRON EMISSION AND ELECTRON CYCLOTRON RESONANCE HEATING (EC20)
EditorsE Poli, H Laqua, J Oosterbeek
PublisherEDP SCIENCES
Number of pages6
DOIs
Publication statusPublished - 2019
MoE publication typeA4 Article in a conference publication
EventJoint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating - Greifswald, Germany
Duration: 14 May 201817 May 2018
Conference number: 20

Publication series

NameEPJ Web of Conferences
PublisherE D P SCIENCES
Volume203
ISSN (Print)2100-014X

Workshop

WorkshopJoint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating
Abbreviated titleEC
CountryGermany
CityGreifswald
Period14/05/201817/05/2018

Keywords

  • TOKAMAK
  • WAVES

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