Reliable refrigeration is critical to the viability of cryogen-free superconducting magnets. The servicing of a refrigerator coldhead must not interrupt the magnet operation. A dual refrigerator coldhead assembly is described in this paper which enables the disconnection of a coldhead for servicing while a second coldhead provides continuous cooling. The two-stage Balzers UCH-130 coldheads are thermally connected to the cryostat thermal shield at the first stage and to the superconducting magnet at the second stage. The assembly includes high-T/sub c/ superconducting current leads heat stationed between the first and second stages of the coldheads in order to minimize the heat leak to the magnet. Vibration isolation components minimize the transmission of the coldhead vibration to the magnet and the thermal shield. This paper describes the design, fabrication, and testing of the dual refrigerator assembly.
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机译：可靠的制冷对于无制冷剂超导磁体的生存至关重要。冰箱冷头的维修不得中断磁铁的运行。本文介绍了一种双冰箱冷头组件，该组件能够断开冷头的维修，而第二个冷头提供连续的冷却。两级Balzers UCH-130冷头在第一级与低温恒温器热屏蔽层热连接，在第二级与超导磁体热连接。该组件包括高T / sub c /超导电流引线，热量位于冷头的第一级和第二级之间，以最大程度地减少对磁体的热泄漏。隔振组件最大程度地减少了冷头振动向磁体和隔热罩的传递。本文介绍了双冰箱组件的设计，制造和测试。
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