Abstract
Siliconization and lithium coating of the wall in the HL-1M tokamak were performed by means of DC glow discharges with a mixture of SiH 4 and He and lithium evaporation in a He glow discharge, respectively. With the wall conditioning, impurities and radiation power losses are generally lower than those with boronization, and strong wall pumping and low hydrogen recycling occur in these tokamak discharges. The excellent wall conditions lead to great progresses in such experiments as the multi-shot pellet injection, LHCD and long pulse discharges. Removal of these coatings by DC glow discharges with H 2 and He was demonstrated.
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