LHC 2011 - latest news

Week 43: Machine coordinators: J. Uythoven (from 25.10.) & E.B. Holzer

Goals of the week:

Monday: 25ns MD for 24 hours

Tuesday: 9:00 high pile-up MD for 8 hours

then Luminosity production till Friday morning

Friday (24 hours) preparations for ion run (proton pilot beams)

Luminosity production till Sunday evening (End of proton physics 2011)

Sunday 18:00 start of MD block

 

 

Day

Summary

Link to report from morning meeting
Monday 31th October
  • 07:00 Start of Proton – Lead MD.
830 meeting
IR2 ions aperture (Jörg)
Sunday 30th October
  • 00:40 Loss maps, betatron H & V
  • Beam Dump XPOC/IPOC problem with cfi-ua63-mkdpm2 and cfi-ua67-mkdpm2 , some resets
  • 02:40 Transverse damper checks: OK (ions set-up remains to be done)
  • 04:00 Some injection steering
  • 07:27 Stable beams with enhanced satellites, fill #2266
  • 09:49 Vacuum spike at point 4 around the BGI dumped the beam.
  • 12:57 Stable beams fill #2267
  • 17:17 Last proton physics beam dump of 2011
  • 18:00 Start MD - ATS optics dry run
  • ¨22:00 Start MD on tune working points, one hour ahead of time
9:00 meeting
Saturday 29th October
  • 11:00 Cryo recovered. Starting precycle,
    however, ATLAS needs an urgent access after pre-cycle.
  • 12:08 Precycle finished, ATLAS access starting
  • 13:37 Injecting probe beam
  • 14:20 Ramp starting, with pilots for 1 m b* tests at IP2 for ion run
    Start with optics measurements
  • 18:00 Start with collimator alignment IP2
  • 19:00 Start aperture measurements
 9:00 meeting
Friday 28th October
  • 02:05 Beams dumped, fill #2261, lost the cryo maintain in MSR6. Integrated lumi: 51, 0.06, 50, 7 pb-1
  • 08:30 Cryo conditions back, start pre-cycle
  • Squeeze commissioning to 1 m in IP2, in preparation of ion run
  • 19:53 beams dumped
    Electrical glitch. Cryogenics lost in sector 12. Expect beams back on Saturday morning.
 8:30 meeting
Thursday 27th October
  • 00:57 fill 2257 dumped during squeeze (RQTF.A67B1)
  • 03:52 stable beams fill 2258
  • 4:33 Dumped, problem of LBDS dilution kicker power supply
  • 05:50 MQ27L2 QPS not ok, Access required
  • 08:17 Decide to also change the Beam Dump MKBH-B B2 power converter.
  • 10:15 LHC ready for injection. Preparing for injection with increased satellites.
  • 13:02 Beams dumped when attempting to inject B1 144b. "Quench"  B8L2.
  • Recover magnets and check TL with injections on TI2 TED.
  • 16:00 Prepare LHC for injection, steering of the transfer lines.
  • 19:25 Filling for physics
  • 20:51 Stable beams fill #2261, with enhanced satellites.
    Initial lumi's 3.2e33 and 3.7e30 (Alice) cm-2s-1. Afterwards Alice at 5e30.
 8:30 meeting
Wednesday 26th October
  • 06:22 Stable beams fill #2254. Initial lumi 3.5e33 cm-2s-1
  • 09:30 Beam dump due to cryo fault sector 12, most likely SEU
    Integrated lumi 34 pb-1
  • Access to change RQT13.R5B1. Problem with MAD.
  • front end memory problem leads to no data from several BPM crates, solved by 20:00
  • 22:54 stable beams fill 2256, dumped 9 minutes later by Power converter, trip of RCS.A34B1
8:30 meeting
Tuesday 25th October
  • 10:30 end of 25ns MD and access for QPS (ALICE, Atlas in the shadow)
  • high pile-up physics run
  • 19:40 dump high pile-up physics run
  • Problems SPS RF, RQT13.R5B1 trips and OFSU
 08:30 meeting
Monday 24th October
  • fill 2242 dumped around 5:00 Monday - trip of RCBX.V2.R1(again)
  • 25 ns tests (24 hours)

08:30 meeting

Special running
Massi Ferro-Luzzi

First look at TOTEM results Karsten Eggert

High bunch intensity instability Elias Metral