Pellet fuelling experiments in the HL-1M tokamak

摘要

An eight shot pellet injector is used to fuel the HL-1M tokamak from the low field side. The pellet ablation process is investigated with a CCD camera and an array of H_α emission detectors. It is observed that the velocity of the pellet ablation cloud is obviously slowed down after it enters the plasma. The ablation clouds are elongated along the magnetic field direction. By means of multi-exposures with the CCD camera during pellet ablation, the safety factor profile is estimated with the ablation cloud inclination angles with respect to the torus on HL-1M.