Temperature change and power deposition analysis of HT-7 Tokamak limiter during long pulse plasma discharge

It is important to calculate the temperature change and heat flux in the surface of the limiter in HT-7 for analyzing the influence of its function on the plasma during long pulse discharge. In this paper, the heating flux density was calculated by the curve of temperature at 3 mm from limiter surface. For many long pulse shots, temperature at a few local points was over 1000°C, and deposited power flux density exceeded 10 MW/m². But by effectively controlling plasma position, temperature dispersal was more uniform and plasma discharge was easily sustained. The influence of limiter materials and construction on the temperature change of limiter surface was discussed, and in-time cooling power of water was analyzed.