Study on Forced Flow Cooling of Superconducting Magnet for Compact Synchrotron

To cool the superconducting magnets of a compact synchrotron, a forced flow cooling system with cooling capacity of 10.16 watts at 4.5 K based on GM/J-T concept is designed. As a preliminary research of the cooling system, a research device is built. The research device shares a similar flow diagram with the cooling system, but the GM cryocooler is replaced by a cold helium pre-cooling section to searching the system parameters and improve the system response speed. For the research device, the pre-cooling section consumes 0.332 g/s of liquid helium and generates 0.565 g/s of liquid helium after throttling by the J-T valve. To elucidate the performance of the heat exchangers based on enthalpy balance, the cycle point parameters are picked. The results of the thermomechanical analysis show that the temperature, the temperature difference and the pressure of helium at inlet of the JTH section how to affect the cooling capacity of the system. The heat leakage analysis, the design parameters optimization and the cycle efficiency improvement in the system are also discussed in this paper.