Present Status and Prospects of Research on Zonal Flow 3.Recent Experimental Studies of Zonal Flow 3.2 Zonal Flow Study with Heavy Ion Beam Probes I

Abstract

This report presents the recent identification of stationary zonal flow in CHS plasma using twin heavy ion beam probes and describes the general diagnostics principle used. The heavy ion beam probe measurement reveals that electric field fluctuation at low frequencies less than ˜1 kHz exhibits the characteristics of zonal flow, i.e., toroidal symmetry and a finite radial wavelength of the fluctuation.