Based on the multi-physics field coupling analysis method, this paper establishes a one-dimensional quenching process model of the coupler. The model investigates the impact of nonlinear factors within material properties and internal heat sources on the accuracy and stability of numerical solutions. The results show that the heat leakage of the coupler niobium tube near the normal temperature end is the key factor affecting the quench. Extending the length of the niobium tube in contact with liquid helium or using materials with higher RRR values can effectively reduce the temperature of niobium tube. To ensure that the niobium tube remains in superconducting after the application of the electromagnetic field, the heat leakage near the normal temperature end should be controlled not to exceed 5.18 W. When heat leakage increases over time and leads to quench, the propagation speed and extent of the quench are influenced by both the rate at which heat leakage grows and the level of heat leakage. After a quench occurs, controlling the heat leakage can restore the coupler to superconductivity with a delay time of about 0.2 s.

accelerator, superconducting coupler, coupling analysis, quench

基于多物理场耦合分析方法, 建立耦合器的一维失超过程模型, 并解决材料物性和内热源中非线性因素对数值求解精度和稳定性的影响问题。结果表明, 耦合器铌管靠近常温端的漏热是影响失超的关键因素, 延长铌管与液氦接触部分的长度或采用更高RRR值的铌材, 均可以有效降低铌管温度。为了保证施加电磁场后耦合器整体不发生失超, 应控制铌管靠近常温端的漏热不高于5.18 W。当此部分漏热量随着时间的推移而失超时, 失超传播速度和失超区域的占比受漏热增长率和漏热量的共同影响。发生失超后, 控制漏热量的变化可以使耦合器重新恢复超导, 延迟时间约为0.2 s。

加速器, 超导耦合器, 耦合分析, 失超