Abstract: A calorimetry system is developed in the EAST tokamak to monitor the heat load distribution of plasma-facing components, and it is employed to evaluate the heatload exhausted by cooling water via the temperature difference between inlet and outlet of water loops. The results show that about 80% of total input energy is measured by the calorimetry system in an upper single null divertor configuration discharge, in which, about 50% of the heat load is deposited on the upper divertor. Moreover, the change rate of heatload increases with heating power. By fitting the fall-off phase of the measured water temperature, the time constant of thermal decay of cooling system is investigated for the upper and lower divertor, respectively. The former is 13.6s, which is about 10% of that in the later case.

Key words: Heat load, Calorimetry system, Long pulse, Cooling system, EAST tokamak

摘要： 通过测量EAST装置水冷系统的出入口冷却水的温差和流量，搭建了第一壁热负荷测量系统，实现了第一壁热负荷的分布测量。实验结果表明，在上单零偏滤器位形放电实验中，该系统测量的热负荷约占总注入能量的80%，其中，接近50%的热负荷沉积在上偏滤器区域。高的加热功率会使得第一壁热负荷更快上升。通过冷却水降温曲线拟合计算得出EAST装置上钨偏滤器水冷系统的热衰减时间约为下石墨偏滤器水冷系统的十分之一。

关键词: 热负荷, 热负荷测量系统, 长脉冲, 水冷系统, EAST