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Saturation of zonal flow in gyrofluid simulations of electron temperature gradient driven turbulence

Li, J.; Kishimoto, Yasuaki; Idomura, Yasuhiro   ; Miyato, Naoaki; Matsumoto, Taro

An enhanced zonal flow is observed in collisionless electron temperature gradient (ETG) driven turbulence with weak magnetic shears. The Kelvin-Helmholtz (KH) instability is proposed as a primary damping mechanism of such flow. Some considerable evidences for the KH mode excitation are presented. Results seem to suggest a possibility of turbulence transition from the ETG-dominated one to the KH-dominated one due to the zonal flow dynamics in weak shear plasmas.

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