Quench energy and fatigue degradation properties of Cu- and Al/Cu-stabilized Nb-Ti epoxy-impregnated superconductor coils
Quench energy and fatigue degradation properties of Cu- and Al/Cu-stabilized Nb-Ti epoxy-impregnated superconductor coils
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Cu 和 Al/Cu 稳定 Nb-Ti 环氧树脂浸渍超导线圈的淬火能和疲劳退化特性
DOI：
10.1109/77.402529
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发表时间：
1995
影响因子：
1.8
通讯作者：
M. Superczynski
中科院分区：
文献类型：
--
作者：
S. Bray;J. Ekin;D. Waltman;M. Superczynski
在4 K和5 T下对小型环氧浸渍cu稳定和Al/ cu稳定Nb-Ti测试线圈的比较测量中，根据相对工作电流的不同，熄灭Al/ cu稳定线圈所需的热能是cu稳定线圈的4到12倍。此外，测量了线圈的稳定器电阻率（/spl rho/）作为机械疲劳的函数，以测试应变引起的退化。cu稳定线圈的/spl rho/相对不受疲劳的影响，而Al/ cu稳定线圈的/spl rho/随疲劳的增加而增加。然而，在这些线圈中，具有典型的稳定剂：超导体比为4:1，Al/ cu稳定线圈的退化在数百次疲劳循环后开始饱和；2000次疲劳循环至0.2%应变后，Al/ cu稳定线圈的/spl rho/仍比cu稳定线圈的/spl rho/低2.6倍。此外，Al/ cu稳定线圈在室温下退火48小时后，/spl rho/降解降低了76%。因此，使用Al/Cu稳定剂可以显著改善磁体的稳定性，即使在磁体因反复通电而遭受疲劳退化的情况下
In comparative measurements of small-scale epoxy-impregnated Cu-stabilized and Al/Cu-stabilized Nb-Ti test coils at 4 K and 5 T, the heat energy required to quench the Al/Cu-stabilized coil was 4 to 12 times greater than for the Cu-stabilized coil, depending on the relative operating current. Also, the coils' stabilizer resistivity (/spl rho/) was measured as a function of mechanical fatigue to test for strain-induced degradation. The /spl rho/ of the Cu-stabilized coil is relatively unaffected by fatigue, while that of the Al/Cu-stabilized coil increases with fatigue. However, in these coils, having a typical stabilizer:superconductor ratio of 4:1, the degradation of the Al/Cu-stabilized coil begins to saturate after several hundred fatigue cycles; after 2000 fatigue cycles to 0.2% strain, the /spl rho/ of the Al/Cu-stabilized coil is still 2.6 times lower than the /spl rho/ of the Cu-stabilized coil. Furthermore, after annealing the Al/Cu-stabilized coil at room temperature for 48 hours, the /spl rho/ degradation was reduced by 76%. Thus, the use of Al/Cu stabilizer may offer substantial improvements in magnet stability, even where the magnet is subjected to fatigue degradation from repeatedly energizing the magnet.<<ETX>>