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Wednesday 23 rd January & night

Wednesday 23 rd 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 lumi 1.9 nb-1 in 9h23m .

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Wednesday 23 rd January & night

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  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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