超导线圈的等效热膨胀系数的理论与实验研究

摘要

Theoretical model and method were present to calculate the thermal contraction of superconducting coils. Different methods of measuring thermal expansion were shown and the measuring technique of cryogenic strain gauges was explained in detail. Thermal expansion of superconducting coil samples wound by NbTi wires with rectangle cross-section were measured with cryogenic strain gauges method in 77-300 K. The tested values were compared with the calculated results at last.%给出了计算超导线圈等效热膨胀率的理论模型和计算方法,对比了各种测量材料线膨胀系数的实验方法,并且给出了低温应变片测量热膨胀系数的技术原理.采用低温应变片法测量了矩形截面导线缠绕成型的超导线圈由77 K到300 K的线膨胀系数,并将实验测试结果与理论计算结果进行了对比分析.