Cooling and warm-up of the VELO under neon atmosphere. conditions results (Jan 28 30) implications. Warm cool tests with the backup cooler to investigate the possibility to operate the VELO and PU-detectors, while LHCb beam pipe and VELO are under a neon atmosphere of ≈860 mbar.
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under neon atmosphere
the possibility to operate the VELO and PU-detectors,
while LHCb beam pipe and VELO are under a neon
atmosphere of ≈860 mbar.
How do AP (=pbeam) and DP (=pbeam - pdet) behave ???
Recently temperature variations in the pit have generated
variations in DP of the order of 3 mbar in 5 hours.
Vacuum PLC and active neon gas injection system (GIS)
guarantee that DP stays within range, i.e. (-5,+2) mbar.
However, present GIS is not designed for continuous
Data taken on January 30, 2008
Baseplate heating ON