加速器, 超导耦合器, 耦合分析, 失超

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