长脉冲等离子体放电下HT-7装置限制器温度变化及能流分析
Temperature change and power deposition analysis of HT-7 Tokamak limiter during long pulse plasma discharge
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摘要: 在HT-7托卡马克等离子体长脉冲放电过程中，作为直接面对等离子体的第一壁限制器表面的温度变化及其承受的能流密度的计算，对于判断限制器的作用和对等离子体的影响都有非常重要的意义。主要从测量到的距离限制器表面3mm处温度变化曲线,采用无限大平面模型计算限制器模头表面能量沉积的能流密度,并讨论了不同等离子体放电下局部点能流密度的差别。多数长脉冲放电下，少数局部点的温升超过1 000℃，最大能流密度超过10MW/m 2；但通过对等离子体位移的控制，局部点温升被抑制，高密度能流持续时间短，有利于长脉冲放电。同时对限制器结构和材料对模头温度的影响也做了比较详细的分析。Abstract: 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 3mm from limiter surface. for many long pulse shots, temperature at a few local points was over 1 000℃, and deposited power flux density exceeded 10MW/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; in-time cooling power of water was analyzed.
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Key words:
- log pulse plasma discharge /
- limiter /
- heating impact /
- flux density
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