A liquid helium cryogenic system design for the GEM magnet
Conference
·
OSTI ID:45430
- Lawrence Livermore National Lab., CA (United States)
- Superconducting Super Collider Lab., Dallas, TX (United States)
The Superconducting Super Collider (SSC) Gammas, Electrons, Muons (GEM) magnet is a large superconducting solenoid with a total mass of 1.05 x 10{sup 6} kg and a stored energy of 2.5 GJ. A cryogenic system to cool and to maintain the GEM magnet to liquid helium temperature is described. The system is designed to operate effectively under a variety of operating conditions, including cooldown/warm-up, steady state operations, and quench. Primary cooling during steady-state operation is based on natural circulation thermosiphon flow through cooling tubes in the solenoid support bobbin. Additional cooling loops are included for lead and joint cooling and conductor stabilization. A helium refrigerator/liquefier rated at 2 kW and 20 g/s will be specified to meet the refrigeration requirements. Cooldown of the magnet from 300 K to liquid nitrogen temperatures is accomplished using a counterflow helium-to-liquid-nitrogen heat exchanger independent of the helium refrigerator. The system incorporates provisions for maintenance access during accelerator beam operation.
- DOE Contract Number:
- AC35-89ER40486
- OSTI ID:
- 45430
- Report Number(s):
- CONF-930703--
- Country of Publication:
- United States
- Language:
- English
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