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

Chellaï, O.; Alberti, S.; Furno, I.; Goodman, T.; Maj, O.; Merlo, G.; Poli, E.; Ricci, P.; Riva, Fabio Matteo; Weber, H.; TCV Team

doi:10.1088/1741-4326/abf43f

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Riva_2021_IOP_Nuclear_Fusion_MIllimeter-wave

Journal article

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

Chellaï, O. Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), Switzerland - Princeton Plasma Physics Laboratory, United States of America
Alberti, S. Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), Switzerland
Furno, I. Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), Switzerland
Goodman, T. Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), Switzerland
Maj, O. Max Planck Institute for Plasma Physics, Garching, Germany
Merlo, G. Institute for Fusion Studies, University of Texas at Austin, United States of America
Poli, E. Max Planck Institute for Plasma Physics, Garching, Germany
Ricci, P. Swiss Plasma Center (SPC), École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
Riva, Fabio Matteo ORCID Istituto ricerche solari Aldo e Cele Daccò (IRSOL), Faculty of Informatics, Università della Svizzera italiana Switzerland
Weber, H. Max Planck Institute for Plasma Physics, Garching, Germany
TCV Team

2021

Published in:

Nuclear Fusion. - 2021, vol. 61, no. 6, p. 066011

English 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.

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