LHC 2012 - latest news

Week 12: Machine coordinators : Barbara Holzer, Jan Uythoven

Beam Commissioning Planning

 

Date

Summary

Link to report from morning meeting

Monday 26th March
  • 00:00 ADT fast losses test
  • 1:00 ADT set-up
  • 2:00 BGI test B1 4 nominal bunches
  • 3:30 - 8:00 b* measurement with K-modulation at 0.6m
  • 8:00 lost cryo
8:30 meeting
Sunday 25th March
  • 00:00 Pre-cycle or ramp (no beam) - decay measurement at 450 GeV
  • 6:00 longitudinal loss maps 450 GeV
  • 9:00 Sort out orbit (feedback) on the ramp
  • 15:00 Injection protection set-up
9:00 meeting
Saturday 24th March
  • 01:16 Ramp of 1 pilot with flattened functions for Q and Q corrections
  • 03:00 MP tests and ramp with collimator functions
  • 04:50 Ramp with collimator functions
  • 06:30 Access interlock (from door between UJ83 and LHCb cavern US85)
  • 06:30 Access for fixing the access system
  • 12:30 Machine closed
  • 12:30 Bridge A cooling fault on RB.A67, piquet called
  • 17:00 finished pre-cycle, loss maps 450 GeV and sync. dump test
  • 20:00 First ramp-up with one nominal bunch / beam and tight collimator setting; collimator set-up at flat top
8:30 meeting
Friday 23rd March
  • 08:00 Access
  • 11:20 Machine closed, cycling the magnets
  • 12:45 Probe injected, machine protection tests after modifications during access
  • 14:00 Refill blown-up probes for aperture measurements
  • 14:40 Ramp - squeeze - aperture measurements at 0.6 m
  • 23:39 Dump after aperture studies
8:30 meeting
Thursday 22nd March
  • 00:20 - 2:40 on longer squeeze function, orbit and chroma correction at 4 TeV
  • 2:40 5:30 second cycle with long squeeze
  • 5:46 7:00 TI8 stability check
  • 08:00 15:00 Check of b* at 0.7 m and 0.6 m
  • 15:00 - 16:00 splashes for ATLAS
  • 16:00 - 17:00 energy feedback tests on orbit feedback (left operational)
  • 17:39 Lost ramp for crossing checks at 3.8 TeV
  • 20:58 Dump of beam after squeeze executed for the first time with nominal crossing and separation to the end
  • 21:45 TCDQ set-up
8:30 meeting
Wednesday 21th March
  • 07:45 beam lost during K modulation
  • 08:00 - 08:15 test longer squeeze function
  • 09:00 setting up collimator at 450 GeV
  • 24:00 Collimation set-up at injection finished
8:30 meeting
Tuesday 20th March
  • 00:00 Beam Gas Ionisation (BGI) Monitor set-up
  • 02:00 BLM Machine Protection tests
  • 06:20 start precycling the machine after the trip of RQT11.R5B2, PC fault
  • 07:40 Beams in again for K-modulation test
  • 09:00 RF phase set-up & blow-up in ramp
  • 13:45 Beam at 4 TeV - keep beam because of another SPS EDF intervention: ramp and squeeze
  • 15:30 dump beams and test new stretched squeeze functions
  • 16:00 - 23:00 injection studies
  • 23:00 - 7:45 optics during squeeze, beta beating correction
8:30 meeting

Monday 19th March

  • 02:00 Ramp and squeeze attempt. Lost due to bad reading of a temperature sensor in cell 23.R7.
  • 06:30 Another ramp and squeeze: lost on third integer in the squeeze beyond 2 m.
  • 08:30 Start another ramp
  • 13:40 Lost beam in squeeze between 0.8 m and 0.7 m, V-tune B2 across resonance.
  • 14:30 Waiting for EDF intervention at the SPS.
  • 15:15 SPS back - start aperture checks at 450 GeV.

8:30 meeting