MuCool Superconducting Solenoid Quench Simulations and Test Stand at FNAL.

摘要

MuCool superconducting solenoid fabrication and preparation for tests are in progress now. The solenoid passive quench protection system based on cold diodes and shunt resistors. The solenoid does not have heaters and quench propagation relied on the superconductor quench, and quench back effect caused by eddy currents in the Al coil mandrel. The solenoid has a very large inductance approx. 600 H and stored energy which is 100% dissipated in the cold mass during a quench. This makes their protection a challenging task. The paper presents the quench analysis of this solenoid based on 3D FEA solution of coupled transient electromagnetic and thermal problems. The simulations used the Vector Fields QUENCH code. To confirm the solenoid design at FNAL is built the Solenoid Test Stand. One of the critical issues is the solenoid fringe field which interacts with the surrounding equipment. In the paper presented field analysis and corresponding magnetic forces. The Test Stand includes the sophisticated DAQ system to monitor carefully quench events, and temperatures.