The Test Results of On-Board Refrigeration System with Low-Temperature Buffer Tank
One of the basic requirements on JR-maglev system is to realize an on-board refrigeration system for the superconducting magnet. This system should be a closed-cycle one, designed to avoid transfer of helium gas between it and ground backup system as far as possible. Upon energizing the superconducting magnet, the heat generated from the superconducting coil vaporizes liquid helium. In the conventional system, helium vapor is then temporarily recovered in the on-board buffer tank at ambient temperature to be re-liquefied by the refrigerator. But to store gas at ambient temperature is not desirable, because the buffer tank is too large to be mounted on board. Then we hit on a new idea to store the helium gas in an on-board buffer tank not at ambient temperature but at low temperature below 10K. We place a low-temperature buffer tank in the cryostat, downstream of Joule Thomson valve of on-board GMJT refrigerator. The volume of this tank is 5 liters permitting excessive heat load. Since the vapor is thus recovered at low temperature and high pressure, we can save the space and get a higher thermal efficiency. In this paper, we discuss about the test results and characteristics of this testing apparatus.
KeywordsMass Flow Rate Liquid Helium Refrigeration System Superconducting Magnet Pressure Line
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