LHC 2012 - latest news

Week 45: Machine coordinators: Barbara Holzer, Jorg Wenninger

Goal of this week: Luminosity production.

Date

Summary

Link to report from morning meeting

Monday 12 Nov
  •  04:50 Beam dump, trip of RF line 4B, integrated L ~120 pb-1.
  • Access for RF.
  • 07:00 Injecting. FBCT phasing. Line steering.
08:30 meeting
Sunday 11 Nov
  • 10:00 SPS drying out and starting cold check-out.
  • 12:00 LHC closed, start precycle.
  • 14:00 Injection. Steering TLs.
  • 16:00 Ramp - at last !
  • 17:00 Beam lost in adjust - RF trip.
  • 19:00 Beam dumped at injection by LHCb. B2 ghosts from SPS or un-captured beam in the LHC. Set back batch-by-batch blowup target to 1.1 ns.
  • 20:50 Stable Beams fill 3279, initial L ~7e33 cm-2s-1.
09:00 meeting 
Saturday 10 Nov
  • 10:00 Cryo back, starting pre-cycle.
  • 11:00 LHC ready, but problem on SPS dump kicker (switch exchange).
  • 15:15 Injecting.
  • 16:00 Compensator Pt8 off.
  • 17:00 We carry without compensator.
  • 18:00 POPS down.
  • 19:30 Filling again.
  • 20:00 Problems with injection losses. Dumped on B1 injection with 144b.
  • 20:30 SPS BA2 flooded. SPS off.
  • 22:00 Switched off S81 and S78 - water alarms in Pt8.
09:00 meeting
Friday 9 Nov
  • 02:50 Stable Beams fill 3273, initial L ~7e33 cm-2s-1.
  • 10:40 Beam dump by OP - lost cryo in Pt8. integrated L ~124 pb-1.
  • Cryo Pt8 off. Access.
08:30 meeting
Thursday 8 Nov
  • 2:10 Beam dump by OP, integrated L ~188 pb-1.
  • Trip of RQTL10.R3B2 in the ramp down. Access needed.
  • 06:00 Filling.Had to stop for steering...
  • 09:00 Energy matching, batch-by-batch blowup re-activated to 1.4 ns.
  • 10:00 TI2/8 steering.
  • 12:00 Filling for physics.
  • 13:30 Stable Beams fill 3272, initial L ~7.2e33 cm-2s-1.
  • 14:00 TCLs opened.
  • 17:00 Beam dump, COD trip. Integrated L ~70 pb-1.
  • Access for ALICE and ROD/F in Pt5. LHCb polarity to +.
  • 23:30 Start refilling.
08:30 meeting
Wednesday 7 Nov
  • 03:30 Spurious trip of S67 (RB).
  • 06:00 Injecting probes.
  • 09:00 Injection.
  • 10:00 Transfer line steering...
  • 12:00 Filling.
  • 13:40 Stable Beams fill 3269, initial L ~7.2e33 cm-2s-1.
  • 20 fb-1 !!
08:30 meeting
Tuesday 6 Nov
  • 13:30 Beam dump, integrated L ~198 pb-1. FPS on Q9.L2.
  • Access until injectors / SPS ready again after technical stop / magnet and wire-scanner intervention.
  • 20:00 LHC closed, pre-cycle started.
  • 21:00 LHC ready at injection, SPS RF problem.
  • Waiting for injectors...
08:30 meeting
Monday 5 Nov
  • 00:02 Start filling
  • 01:31 Stable Beams fill 3265, initial L ~7.0e33 cm-2s-1.
  • 13:30 end of fill study for roman pots
  • 15:08 Beam dump by losses over threshold close to the RP 6R5 B1 (82ms - 1.3s BLM running sums).  integrated L ~183 pb-1.
  • 22:15 Stable beams fill 3266, initial L ~6.5e33 cm-2s-1.
08:30 meeting