Refrigerator Technology for Cooling RF Cavities and Magnets

Abstract

The refrigerator technology is indispensable for superconducting accelerators. The primary function of the refrigerator is to keep the low temperature environment for the superconducting devices such as superconducting RF (SRF) cavities and superconducting (SC) magnets, and to remove generated heat from these superconducting devices and heat leakage from the room temperature ambience. SRF cavities and SC magnets have different thermodynamic characteristics from cryogenic point of view, and hence the refrigerators for each of them have different configuration to establish appropriate cooling schemes. This article describes the refrigerator technology for SRF cavities and SC magnets with emphasis on the different cooling schemes for each device.