Impact of an Electron-Cyclotron source on tokamak turbulence
Résumé
An electron-cyclotron (EC) source can induce an enhanced electron transport even far from the power deposition area. This transport is attributed to an increase of turbulent transport induced by the interaction between the EC wave and the plasma. This claim is supported by different indirect evidences pointing in the same direction. On the experimental side, the detailed analysis of TCV plasmas heated by a power-modulated electron-cyclotron suggests an increased transport of suprathermal electrons proportional to the applied power. This is associated with a modest but non negligible increase of the fluctuation level. The increase of particle transport when the electron-cyclotron heating source is applied is also
supported by simulations of these TCV shots performed with the Fokker-Planck code LUKE, and is also suggested by global gyrokinetic simulations performed with the ORB5 code.
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