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The alleviation effect of transient heat load on helium holes/bubbles has been demonstrated using ruby laser pulses for the transient heat source in the divertor simulator NAGDIS-II. It is shown that the holes and bubbles disappeared following the irradiation of the ruby laser pulses, while the surface roughness was significantly enhanced by the irradiation of the Nd:YAG laser pulses. Based on the numerically calculated temperature in the specimen, the physical mechanism causing this difference is discussed particularly in terms of pulse width (0.6ms for ruby laser without a Q-switch and 5ns for Nd:YAG laser with a Q-switch).

Alleviation of Helium Holes/Bubbles on Tungsten Surface by Use of Transient Heat Load