Millimeter-wave beam scattering and induced broadening by plasma turbulence in the TCV tokamak

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Abstract

The scattering of millimeter-wave beams from electron density fluctuations and the associated beam broadening are experimentally demonstrated. Using a dedicated setup, instantaneous deflection and (de-)focusing of the beam due to density blobs on the beam path are shown to agree with full-wave simulations. The detected time-averaged wave power transmitted through the turbulent plasma is reproduced by the radiative-transfer model implemented in the WKBeam code, which predicts a ∼50% turbulence-induced broadening of the beam cross-section. The role of core turbulence for the considered geometry is highlighted.

Original languageEnglish
Article number066011
JournalNuclear Fusion
Volume61
Issue number6
DOIs
Publication statusPublished - Jun 2021

Keywords

  • ITER
  • Langmuir probes
  • electron-cyclotron resonant heating
  • full-wave simulations
  • millimeter-wave beam
  • millimeter-wave scattering
  • plasma turbulence

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