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The guard limiter (GL) with graphite tiles of 4.6GHz Lower Hybrid Antennas (LHA) has experienced the discharges in EAST tokamak. Much more hot spots were observed on the surface of GL tiles during the 2015–2016 campaigns. The serious ablations of GL induced by the hot spots limit the superconductor current, the plasma density and the heating power at higher parameter operations. In this paper, the...
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