NbTi超导缆绝缘工艺温度下电阻率的研究

The research of the resistivity under the insulation curing temperature of NbTi superconducting cable

超导线圈绝缘固化可以通过给超导线圈中超导缆通入电流,以超导缆自身产生的焦耳热对线圈加热,得到线圈绝缘工艺所需的温度;同时将CICC导体中Nb Ti超导缆和单根超导线加热到线圈绝缘工艺相关温度,用直流四线法测量Nb Ti超导缆和单根超导线在不同温度下的电阻率,得到在303K^443K温度区间内Nb Ti超导缆和超导线电阻率随温度变化的关系式,并依据超导缆绞缆结构对二者进行折算和对比,确认了超导缆电阻率测量结果的可靠性。根据测得的电阻率-温度关系,可以得到在不同温度下超导缆产生焦耳热的能力,从而为超导线圈绝缘固化温度控制提供了重要的参考依据。

The superconducting coil insulation curing can be heated joule heat until reached the required temperature when switching on the current. We heated the CICC NbTi superconductive cable and the single superconductive wire until the coil insu- lation related temperature at the same time. We used the DC four probe method to measure the resistivity of the NbTi supercon- ductive cable and wire under different temperature. We received the relational expression between the resistivity and temperature of the NbTi superconductive cable and wire in the range of 303K to 443K. We did the conversion and comparison of the test resuits on the basis of wring structure of the superconductive cable. Confirmed the reliability of the resistivity test results of the superconductive cable. We could obtain the ability of joule heat of the superconductive cable under different temperature. The results can provide the important reference of controlling the temperature of superconducting coil insulation curing.