Microwave beam broadening due to turbulent plasma density fluctuations within the limit of the Born approximation and beyond

A. Köhn, L. Guidi, E. Holzhauer, O. Maj, E. Poli, A. Snicker, H. Weber

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
134 Downloads (Pure)

Abstract

Plasma 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.

Original languageEnglish
Article number075006
Pages (from-to)1-13
JournalPlasma Physics and Controlled Fusion
Volume60
Issue number7
DOIs
Publication statusPublished - 15 May 2018
MoE publication typeA1 Journal article-refereed

Keywords

  • density fluctuations
  • electromagnetic waves
  • electron cyclotron waves
  • magnetized plasmas
  • plasma turbulence
  • scattering of electromagnetic radiation
  • simulation

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