Development of the cryostat for the high field magnet system
- Kobe Steel, Ltd. (Japan)
A cryostat for a high field magnet system up to 19 tesla with a magnet bore of 74 mm was developed. The superconducting magnet of this system was able to be cooled by pressurized superfluid helium of 1.8 K. The central field was 17 tesla when cooled at 4.2 K and 19 tesla when cooled at 1.8 K. A liquid helium vessel was divided into two parts (4.2 K upper part, and 1.8 K lower part) by FRP separator. From the analysis of the flow coefficient of the J-T valve, it became clear that the ideal value of the flow coefficient varies about two orders during cool down from 4.2 K to 1.8 K. Therefore, two J-T valves were installed in parallel to reduce the cool down time. A small refrigerator was installed on the top flange of the cryostat. The purpose of this refrigerator was to reduce the evaporation rate of liquid helium and to maintain the superconducting magnet at low temperature while pausing so that liquid nitrogen precooling would not be needed. Insert dewar was installed in the center of the cryostat. From the cooling test, it was observed that a magnet could be cooled at 1.8 K, and that a magnet could be maintained at 79 K while pausing with the refrigerator working.
- OSTI ID:
- 45427
- Report Number(s):
- CONF-930703--
- Country of Publication:
- United States
- Language:
- English
Similar Records
New vertical cryostat for the high field superconducting magnet test station at CERN
Thermal Analysis of the ILC Superconductin Quadrupole