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LHC Operations Summary: January 23rd

A detailed overview of the LHC operations on January 23rd, including beam stability, probe injections, beam dumps, and expert interventions. Updates on ALFA and TOTEM Roman Pots movements and phasing issues. Investigation into unexpected changes in bunch intensities.

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LHC Operations Summary: January 23rd

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Presentation Transcript

  1. Wednesday 23rd January & night • 07:05 Injecting probes • 11:00 stable beams fill 3485 • initial lumi in ATLAS and CMS ~1e29 cm-2s-1 ! • ALFA and TOTEM Roman Pots moved in • 20:30 Beams dumped due to low intensity B2 bunches resulting in BPMS interlock. Integrated lumi1.9 nb-1 in 9h23m. • 21:00 Test of TOTEM RP sequences by Mario: OK • 22:00 Injecting for physics • 22:27 FBCT B1 lost the phasing, David coming. • Quick and dirty fix, to be followed up today • 00:06 Stable Beams – turn around of 3h36m • Initial lumi 1.1e29 cm-2s-1 • 00:11 ALFA moved in • 05:34 Beams dumped due to BPMS B2, again • 1.35 nb-1 in 5h329m • 06:48 Injecting for physics • 07:40 QPS triggered on RQX.L8; beams dumped, expert checking LHC 8:30 meeting

  2. Fill 3485 No overshoot anymore in frequency shift exercise at flat top New record lumi’s with nominal filling scheme of 338 bunches:1e29 cm-2s-1 ! LHC 8:30 meeting

  3. BPMS point 6 • After attenuator intervention in TS4, the expected minimum bunch intensity was around 0.8-1 e9p/bunch • However, we seem to have dump just below 4e9 charges/bunch • Yesterday seemed to be around 3e9 charges/bunch • Under investigation by the experts LHC 8:30 meeting

  4. Various • Get better understanding of BPMS B2 interlocks at higher bunch intensities than expected • Wire scanners not to be used until checked in tunnel • V/d Meer scans next week Mon/Tue • Access requests: • Wire scanner, J.Emery, point 4, 2 hours. • Collimators UJ33, test position sensors, M. di Castro, A.Masi, 20 minutes. • “Train”, B.Feral, D. Paulic, PM56/UL55, 1 h during working hours • BGI, M.Sapinski, R4, ½ h LHC 8:30 meeting

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