Abstract:

The water-cooled model of the toroidal field coils was established calculated according to the heat conduction and the convective heat transfer equation. The results show that the thermal contact resistance and the electrical contact resistance of the interface between the finger joint and the copper plate had a larger effect on the temperature rise of the finger joint. At maximum current of 140kA and the current flattop 7s, the maximum temperature rise of the toroidal coils with the finger joint was below 40℃, so the maximum temperature of the coils wouldn’t exceed 80℃, and the temperature of the toroidal field was below 30℃ after an interval of 15min. However, at maximum current of 190kA, the current flattop time was determined by the thermal contact resistance, the electrical contact resistance and initial temperature.

Key words: HL-2M tokamak, Toroidal coils, Finger joint, Thermal contact resistance, Electrical contact resistance

摘要：

建立了环向场线圈的水冷计算模型，根据热传导和对流换热方程进行了数值模拟分析。计算结果表明：指形接头与铜板的界面接触热阻和接触电阻对指形接头的温升影响较大，但在平顶电流为140kA 及其电流平顶7s 时，由焦耳热引起的最高温升40℃以下，故环向场线圈的温度均不会超过80℃，且15min 后TF 线圈温度均降至30℃以下。在平顶电流为190kA 时，线圈通电持续时间可根据界面实测接触热阻、接触电阻以及线圈初始温度来确定。

关键词: HL-2M 装置, 环向场线圈, 指形接头, 接触热阻, 接触电阻