LHC 2011 - latest news

Week 21: Machine coordinators: Jan Uythoven, Jorg Wenninger

Goals of the week: stable beams

LHC coordination vistar

 

Day

Summary

Link to report from morning meeting
Monday, 30th May
  • 01:00 Injection for physics fill #1816
  • 02:00 Stable beams fill #1816, luminosity ~1.2x1033 cm-2s-1
08:30 meeting
PLC-Cryo issue
Sunday, 29th May
  • 01:00 Injection for physics fill #1813
  • 03:15 Stable beams, peak luminosity ~1.0x1033 cm-2s-1
  • 04:45 Beam dumped by an UFO in 28.L8
  • 07:00 Fill and ramp for loss map and test dynamic betastar limits for collimator gaps
  • 08:30 Dump with loss map and recycle for filling
  • 09:30 Filling with 1092 x 1092 bunches, fill #1815
  • 10:53 Stable beams fill #1815, luminosity ~1.25x1033 cm-2s-1
  • 21:30 Dumped by fault on RCBXH2.R1 - QPS. Integrated luminosity of fill 1815 37.8 pb-1 - new record.
 08:30 meeting
Saturday, 28th May
  • 00:30 beam dumped. FMCM on RD1.LR5 - electrical perturbation.
  • Refill. Beam dumped on flat top - again electrical perturbation. FMCM RD1.LR5, RB23 off.
  • MTG problems. Switch to MTGB.
  • 08:15 Stable beam fill #1812, initial luminosity ~1x1033 cm-2s-1 
  • MTGA repaired by CO.
  • 18:45 Adjust mode, RF off tests. Integrated luminosity 31.7 pb-1 (CMS) - new LHC record for a fill.
  • 20:00 Beam dumped. Tested SIS interlock on total voltage (after dump).
  • 21:00 Access for QPS and UPS.
 08:30 meeting
Friday, 27th May
  • 05:20 Cryo back
  • 07:00 Injection of first beam
  • 08:45 Cryo unstable & RF system reboot
  • 11:00 Loss maps at injection, TDI and TCLI position check. BPF limit checked to be slightly below 1E9.
  • 16:00 Filling 912x912.
  • 18:30 Dumped at 563 GeV - new RF total voltage interlock.
  • new RF total voltage interlock deactivated.
  • 22:40 Stable beam fill #1809, initial lumi 1.09x1033 cm-2s-1 
08:30 meeting
Cryogenics
Thursday, 26th May
  • Cryo recovery
  • Energy dependent RF voltage interlock implemented
Wednesday, 25th May
  • 02:43 Beam dump fill #1805, RF cfv-sr4-allfo1 power supply down.
    Integrated lumi 11.4 pb-1
  • Access for change of RF freq. crate
  • 05:45 Injecting for fill #1806
  • 08:20 fill #1806 stable beams. Initial lumi 1x1033 cm-2s-1 
  • 11:20 Beam dumped, cryogenics problem. Delivered lumi 10.2 pb-1
  • Cryo recovery
 08:30 meeting
Tuesday, 24th May
  • 12:20 beam dumped, RF interlock beam 1. Integrated luminosity 29 pb-1.
  • Access for RF
  • 17:30 Loss maps with injection protection in
  • 18:30 Fill # 1805: Injection for physics
  • 23:25 Stable beams. Initial lumi 1x1033 cm-2s-1
 08:30 meeting
Monday, 23rd May
  • 08:00 restart, set up injection
  • 09:30 Stable beam fill #1803 912 bunches - Initial lumi 8.5x1032 cm-2s-1
  • 18:00-19:00 reduce solenoid currents in steps to 0 - little effect on backgrounds.
  • 19:45 dump #1803.
  • Filling delayed - SPS bunch length issues.
  • 02:00 Stable beam fill #1804 912 bunches - Initial lumi 1x1033 cm-2s-1
 08:30 meeting