VJR/VJRR Design, Construction, Installation, and Performance
The Brookhaven National Laboratory (BNL) Relativistic Heavy Ion Collider (RH1C) is a colliding beam accelerator consisting of two interlaced rings of superconducting magnets in an underground tunnel, 3.86 km (2.4 miles) in circumference. The superconducting magnets are cooled by compressed helium at 4.5 K. The cold helium is delivered from the refrigerator to two valve boxes at the magnet ring by way of the approximate 350 m long, 60.96 cm (24″) diameter, Vacuum Jacketed Refrigerator to Ring (VJRR) piping run. The helium is then distributed around both rings through approximately 2,400 meters of 50.8 cm (20″) diameter Vacuum Jacketed Ring (VJR) piping, working in conjunction with the magnet cryostats. The VJRR and VJR piping are both multi-line, 55 K helium heat-shielded, transfer lines, however, each differs in its fundamental design concept and component construction. This paper discusses VJR and VJRR design concepts, as well as certain aspects of component construction, field and tunnel installation, and thermal performance.
KeywordsBrookhaven National Labaratory Process Line Heat Shield Vacuum Break Vacuum Space
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