Excitation properties and cryogenic stability of helical coils for the LHD
Excitation properties and cryogenic stability of helical coils for the LHD
复制标题
LHD 螺旋线圈的激发特性和低温稳定性
DOI：
10.1109/77.920496
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
O. Motojima
中科院分区：
文献类型：
--
作者：
S. Imagawa;N. Yanagi;T. Mito;H. Chikaraishi;S. Hamaguchi;H. Sekiguchi;S. Yamada;T. Satow;Y. Nakamura;S. Satoh;O. Motojima
用于大型螺旋装置的螺旋线圈是世界上运行中的最大的池冷却超导线圈。根据在所有短样品中测得的恢复电流，这些样品有望在4.4K下达到13.0kA的低温稳定性。然而，在高于11kA的条件下，反复诱导出正常区域。它传播到有限长度，并在几秒钟内恢复，但在11.45kA。由于电流扩散到纯铝稳定器的速度很慢，在冷端恢复电流以下，正常区可以动态地传播。进行了励磁试验，通过对螺旋线圈三块的电流进行分级，平均获得了11.65kA的电流。给出了激励过程中的扰动和线圈的低温稳定性。
The helical coils for the Large Helical Device are the world's largest pool-cooled superconducting coils in operation. These were expected to be cryostable up to 13.0 kA at 4.4 K on a basis of the measured recovery currents in all the short samples. However, a normal-zone was induced at higher than 11 kA repeatedly. It propagated to the finite length and recovered within several seconds except at 11.45 kA. Because of slow current diffusion into a pure aluminum stabilizer, a normal zone can propagate dynamically below the cold-end recovery current. The excitation tests have been carried out, and average 11.65 kA has been achieved by grading the current in the three blocks of the helical coil. The disturbance during excitations and the cryogenic stability of the coil are presented.