Cryogenic systems for the SSC and the status of their development
The Superconducting Super Collider (SSC) consists of two parallel magnet rings, each 87,120 m in circumference, constructed in a tunnel 25 to 74 m underground. Protons are injected into these ring from the high energy booster (HEB), which contains a separate magnet ring 10,800 m in circumference constructed in a tunnel 14 m above the collider tunnel. The magnets will be operated at a controlled low temperature in order to maintain the windings in the superconducting state. Therefore the magnet cryostat is designed with a high vacuum insulating chamber, multilayer insulation (MLI), and thermal shields at 84 K and 20 K nominal temperatures. The major portion of the heat load is from thermal radiation and conduction through the supports, and is intercepted and absorbed by the shields. The cryogenic system for the machine is divided into sectors of nominally equal length: ten for the collider and two for the HEB. Each sector has a dedicated cryogenic system (SCS) as well as some level of redundancy from the neighboring SCS. The helium refrigeration plants will be installed at the midpoint of each sector. Each cryogenic sector in the collider is divided into four strings, two upper and two lower, about 4000 m long. Each string is subdivided into sections of about 1080 m, the smallest modules that can be isolated for maintenance, or for warmup and cooldown. Each section is subdivided into cells and half cells. The half cell, containing six main magnets and a spool piece is 90 m long. The SSC cryogenic system for each sector consists of a sector refrigerator surface system (SRS) and a sector refrigerator tunnel system (SRT). Proposals for the SRS systems` are presently in review for vendor selection. In this paper the SRT subsystems requirements and their status will be reviewed.
- Research Organization:
- Superconducting Super Collider Lab., Dallas, TX (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC35-89ER40486
- OSTI ID:
- 10184556
- Report Number(s):
- SSCL-Preprint-489; CONF-930703-24; ON: DE93019747; TRN: 93:021681
- Resource Relation:
- Conference: International cryogenic materials conference (ICMC),Albuquerque, NM (United States),12-16 Jul 1993; Other Information: PBD: Jul 1993
- Country of Publication:
- United States
- Language:
- English
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