The Cryogenic Distribution Line for LHC

by G. Riddone and R. Trant (LHC)

Thursday 12 Jul 2001, 14:15 → 15:15 Europe/Zurich

30-7- (LHC Auditorium)

The LHC superconducting magnets will operate in superfluid helium below 2K. The cryogenic distribution scheme for each of the eight sectors, individually served by a refrigeration plant, is based on a separate Cryogenic Distribution Line (QRL). Via the QRL helium at different temperatures and pressures feeds the local cooling loops. With an overall length of 25.8 km the QRL has a very critical cost-to-performance ratio. Therefore three pre-series test cells (each ~112 m long) were built in industry and extensively tested at CERN. The QRL layout, considering the cryogenic flow schemes, tunnel installation and other aspects, as well as the tests performed on the pre-series test cells will be presented.