Pressurized helium II-cooled magnet test facility
A facility for testing superconducting magnets in a pressurized bath of helium II has been constructed and operated. The cryostat accepts magnets up to 0.32 m diameter and 1.32 m length with current to 3000 A. In initial tests, the volume of helium II surrounding the superconducting magnet was 90 liters. Minimum temperature reached was 1.7 K at which point the pumping system was throttled to maintain steady temperature. Helium II reservoir temperatures were easily controlled as long as the temperature upstream of the JT valve remained above T lambda; at lower temperatures control became difficult. Positive control of the temperature difference between the liquid and cold sink by means of an internal heat source appears necessary to avoid this problem. The epoxy-sealed vessel closures, with which we have had considerable experience with normal helium vacuum, also worked well in the helium II/vacuum environment.
- Research Organization:
- California Univ., Berkeley (USA). Lawrence Berkeley Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5284902
- Report Number(s):
- LBL-10923; CONF-800631-1; TRN: 80-009919
- Resource Relation:
- Conference: 8. international cryogenic engineering conference, Genoa, Italy, 3 Jun 1980
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SUPERCONDUCTING MAGNETS
TEST FACILITIES
CONTROL SYSTEMS
CRYOSTATS
HELIUM II
PERFORMANCE TESTING
ULTRALOW TEMPERATURE
CONTROL EQUIPMENT
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
EVEN-EVEN NUCLEI
FLUIDS
HELIUM 4
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MAGNETS
NUCLEI
QUANTUM FLUIDS
STABLE ISOTOPES
SUPERCONDUCTING DEVICES
TESTING
THERMOSTATS
640450* - Fluid Physics- Superfluidity
420201 - Engineering- Cryogenic Equipment & Devices