Leak-Tightness Assessment of Demountable Joints for the Super Fluid Helium System of the CERN Large Hadron Collider (LHC)
The future high energy accelerator LHC presently considered at CERN, will make heavy use of demountable cryogenic joints operating at superfluid helium temperatures (1.8 K). These joints will be required for connecting the cryomagnets to their feeding lines, helium safety valves to cold masses, both on their measuring benches and eventually in their final installation set-up. The very large size of the future machine and, consequently, the large number of cryogenic joints imply that their reliability in leak tightness be very high, in particular after extreme loading conditions such as the high helium pressures resulting from superconducting magnet quenches.
For these reasons, a test set-up has been especially built at CERN to reproduce these conditions, and to assess the leak tightness reliability of commercially available joints. A description of the facility is presented, together with the first test results.
KeywordsMagnesium Torque Helium Polyethylene Flange
Unable to display preview. Download preview PDF.
- 1.Interconnexion entre les composants magnétiques prototypes du LHC (J.C. Brunet, M. Genet, C. Reymermier, Ph. Trilhe) - ref. CERN/MT/92-06 (ESH) - Note LHC 216Google Scholar
- 3.J. Montuclard, M. Lefrançois, Ch. Romand “What joining Method for the New Generation of Accelerators (SSC and LHC)” Technical Note - Le Carbone Lorraine Cefilac Etanchéité, 90 rue de la Roche du Geai - 42029 ST-ETIENNE/CEDEX - FRANCEGoogle Scholar