LHC 2011 - latest news

Week 17: Machine coordinators: Mike Lamont, Bernhard Holzer

LHC coordination vistar

 

Day

Summary

Link to report from morning meeting

May 2nd May
  • Fill 1755 - peak luminosity > 8e32 cm-2s-1

8:30 meeting

Roberto Losito SEEs seen by collimator system

Labour day
  • Overnight fill lost at 5:30 to BLM communication problem (~30 pb-1)
  • Access for QPS and vacuum (insulation vacuum triplet L5)
  • Head for 768 physics, into stable beams at around 19:00, initial lumi around 8e32
  • Fill lost around 20:30 to collimator position interlock - possible SEE
  • Access required for QPS controller reset
  • Some delays, back into physics around 07:00 Monday morning
9:00 meeting
Saturday 30th April
  • Lost ramp for physics around 2:30 - vacuum spike - R2.
  • Back in physics 06:40, fill lost to octupole power converter trip 08:20.
  • Back in physics 13:30
9:00 meeting
Friday 29th April
  • reasonable fill in overnight (25 pb-1)
  • dumped at 11:00, access for QPS reset (SEU)...
  • quick look at Abort Gap Keeper in the afternoon
  • Around 17:00 - major power glitch - 6 sectors & Atlas down
  • Beam back around 21:30, dynamic correction of b3 trial plus test ramp in shadow of Atlas ramp-up
8:30 meeting
Thursday 28th April
  • 09:00 overnight fill lost - slow beam loss - vacuum spike
  • Access - QPS reset (SEU)
  • Stable beams briefly - fill lost to controls rack crash
  • Back in stable beams around 22:00
8:30 meeting
Wednesday 27th April
  • 07:10 Fill 1739 dumped - cryo problem - cooling
  • Access for Atlas.
  • Injection 624 bunches, problem with fill pattern
  • injection 624 bunches, ramp squeeze, lumi, stable conditions
8:30 meeting

Tuesday 26th April

  • 04:50 Cryo problem in point 2. End of fill 1736
  • 08:00 Cryo recovered.
  • Various accesses - including energy extraction fix in S34.
  • Lost ramp - BPM communication
  • Switched LHCb polarity
  • Access for cryo - filter problem
  • 23:00 Fill 1739 - 5.2 x1032 cm-2 s-1  (ATLAS)

8:30 meeting

Monday 25th April

  • 12:00 150 pb-1 in 2011
  • 13:30: dump fill 1735, 20 pb-1 integrated luminosity.
  • 16:20: Stable beams fill 1736, 480 b/72b per injection. Initial luminosity up to ~4.3x1032 cm-2 s-1  (ATLAS)/~4x1032 cm-2 s-1 (CMS).
  • 20:40 Beam dump due to losses induced by vacuum spike on vacuum gauge close to triplet R8. End of fill #1736
  • 23:45 Stable beams fill 1736, 480 b/72b per injection. Initial luminosity up to ~4.8x1032 cm-2 s-1  (ATLAS)/~4.4x1032 cm-2 s-1 (CMS).

9:00 meeting