ITER用纵场线圈中国首个导体短样的性测试和分析
Test and Analysis of China's First Short Conductor Sample for ITER Toroidal Field Coils
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摘要: ITER用纵场 (TF)线圈CICC导体短样是由OST公司提供的高电流密度Nb3Sn股线制成, 该股线通过内锡法制备工艺完成。导体短样在SULTAN实验室进行测试, 试验包括直流测试, 交流损耗测试;电磁循环前分流温度为7.2K, 经过950次循环通电后测得分流温度为6.9 K, 电磁循环前交流损耗的耦合时间常数为214ms,循环后的耦合时间常数为71.52ms。通过采用计算交流损耗的计算模型对耦合时间常数进行了分析, 采用偏量比例模型对导体短样模拟分流温度的计算。计算结果与试验结果相符, 我们可以用此模型来分析导体的性能。Abstract: In the framework of the ITER Qualification Tests, the first China TF conductor sample (CNTF1) was tested at the SULTAN facility. The sample was made of two TF conductor sections manufactured from identical internal stannum strands provided by the Oxford Superconducting Technology Company (OST). In order to evaluate the conductor performance, the current sharing temperature (Tcs) was measured at specified electromagnetic load cycling steps. Both conductor sections of the CNTF1 sample showed identical performance. Tcs was 7.2 K before cycling loading, and 6.9 K even after 950 cycles, without significant degradation, which substantially exceeds the ITER requirement of 5.7 K. The tests of the CNTF1 conductor sample showed that the electromagnetic cyclic load exhibited a negligible effect on the conductor performance. The coupling time constant for AC loss was 214 ms and 71.52ms before and after the cycling load, respectively. The test results of the sample are compared with the strand performance and parameter model analysis.
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