Millimeter-wave beam scattering and induced broadening by plasma turbulence in the TCV tokamak
O. Chellaï, S. Alberti, I. Furno, T. Goodman, O. Maj, G. Merlo, E. Poli, D. Ricci, Fabio Riva, H. Weber
Abstract
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.
Topics & Concepts
PhysicsTokamakTurbulenceScatteringBeam (structure)PlasmaComputational physicsRadiative transferExtremely high frequencyAtomic physicsOpticsNuclear physicsMechanicsMagnetic confinement fusion researchGyrotron and Vacuum Electronics ResearchParticle accelerators and beam dynamics