LHC 2012 - latest news

Week 49: Machine coordinators: Jorg Wenninger, Jan Uythoven

Goal of this week:  Luminosity production & 25 ns scrubbing

Scrubbing plan 2012

Date

Summary

Link to report from morning meeting

Mon 10 Dec
  • 25 ns fills for scrubbing at 450 GeV
  • 08:22 Access for ATLAS, QPS and TDI point 8.
08:30 meeting
Scrubbing report
Sun 9 Dec
  • 03:00 Dump with 2740b. Lost again the CM on MS in Pt8.
  • Precycle.
  • 04:50 Checking emittance blowup with 72b trains.
  • 05:45 New fill with 288b / injection.
  • 25 ns fills at 450 GeV
09:00 meeting
Sat 8 Dec
  • 01:31 Injected up to 1164 bunches lost cryo conditions in the matching section R8.
  • 04:30 Re-injecting.
  • 07:40 Dump with 2028/2316 bunches, likely due to TDI vacuum in point point 8.
  • Cryo lost due to jump in heat load to the system.
  • 09:20 Start pre-cycle.
  • 10:30 Filling with 288b/injection. Got to 1450b per beam.
  • 12:35 RF trip B2, (fake) spike on vacuum gauge.
  • 13:40 Filling again with 288b/injection.
  • 19:50 Dump with 2450b per beam, scrubbing not efficient anymore (heat load in S56).
  • 20:10 New fill with 288b/injection.
09:00 meeting
Fri 7 Dec
  • 02:30 Beam dumped - TDI to hot (vacuum at 1E-7).
  • 03:30 Scrubbing with 288b / train.
  • 07:30 Machine full, but beam dumped shortly afterwards by BPM interlock IR6 (due to low intensity bunches).Extended softstart for the MKIs.
  • 09:15 12 bunches in agan for both beams.
  • 1256 Machine full: 2 x 2748 bunches.
  • 14:06 Beams dumped.Extended softstart for the MKIs.
  • 15:07 12 bunches in again.
  • 17:53 2460-2748 bunches. Beam dump due to ALICE trigger (UFO like event on the left side of ALICE)
  • 18:00 Cryo lost in sector 81.
08:30 meeting
Thu 6 Dec
  • 01:31 Beam dumped due to trip of RB.A81. Integrated Lumi 55 pb-1 in 2h31m
  • Access for QPS, problems with MAD of UJ87 and UJ14.
  • 09:57 Start pre-cycle.
  • 11:30 ADT setup starting.
  • 18:00 AST setup finished.
  • 20:00 Up to 228b injected OK (but unstable in the LHC).
  • 20:30 Scrubbing with 72b / train.
08:30 meeting
Wed 5 Dec
  • 00:30 Preparing for access in Pt4. Special procedure.
  • 05:00 Machine closed.
  • 06:59 Stable beams fill #3375, L ~ 6.8e33 cm-2s-1.
  • 10:40 Beam dump, trip of RD2.R5. Integrated L 72 pb-1 in 3h39m.
  • Access for TED TI2 repair.
  • 17:00 TED back in access chain. Pre-cycling.
  • B1V tune trimmed flat in squeeze. B2H+V trimmed -5e-3 after 700 s in the squeeze.
  • 19:00 Injecting.
  • 20:30 Beam dumped on flat top, RF trip M1B2.
  • 22:59 Stable beams fill #3378, L = 7.1e33 cm-2s-1
08:30 meeting
Tue 4 Dec
  • 1:30 TDI alignment finished. No changes.
  • Filling for physics.
  • 05:30 Stable beams fill #3370, L ~ 6.9e33 cm-2s-1.
  • 09:30 Beam dump from SIS. Communication problem with FGC due to IT vmware. Integrated L 77 pb-1.
  • 10:57 Injecting physics beam for fill with high brightness beam from the injectors.
  • 12:13 Start ramp, 72 bunches.
  • 13:00 Stable beams fill #3372, L ~3.4e32 cm-2s-1. High brightness test fill.
  • 14:15 Operator dump, end of high brightness fill.
  • 16:05 Injecting for next fill for phsyics.
  • 18:40 Stable beams fill #3374, L ~7e33 cm-2s-1.
  • 22:25 Beam dump, RF trip B2. Integrated l ~70 pb-1.
08:30 meeting
Mon 3 Dec
  • 11:03 Operator Dump Fill #3363. 167 pb-1 in 11h36m
  • Access for ATLAS. Problem TDI point 2.
  • 14:36 Pre-cycle started.
  • 19:00 Injection for TDI alignment.
  • 22:00 Electrical disturbance on 400 kV. LHCb, ALICE, RF and 5 sectors off.
  • 23:30 Resuming TDI alignment.
08:30 meeting
MD Summary