The superconducting outsert of the hybrid magnet at CHMFL is cooled by 4.5 K supercritical helium contained in CICC (cable-in-conduit conductors), which must be capable of extracting any heat load (external and internal) during ramping and high field operating. In the event that the heat loads exceed the cooling capacity of the supercritical helium, superconducting transitions on CICC may happen and a quench protection will be triggered by the control system. The process will cause high heat input in a very short time to the supercritical helium, and consequently, large temperature and pressure fluctuations will occur in the related cryogenic system. In order to test the performance of the cryogenic system during the process of superconducting magnet quenching, quenching experiments with design operating currents of the superconducting magnet were carried out. The testing results shows that the helium cryogenic system can keep a stable operation in the worst protected quenching of the superconducting magnet, and also return to the normal situation automatically.
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