Abstract
This paper describes a Mach probe array with four pins which can measure not only parallel flows but the flow perpendicular to the magnetic field as well. Experimental measurements of the fluctuations and velocities of the toroidal and the poloidal flow have been carried out on both of SOL and the boundary region of HL-1M for ohmic, biased H-mode and LHCD discharges. The results show that the suppressions of the fluctuations are related to poloidal rotations produced by electrode biasing and LH waves injecting in the improved particle confinement modes.
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