LHC 2011 - latest news

Week 29: Machine coordinators: Mike Lamont (We-Mo), Ralph Assmann (Mo-We), Eva Barbara Holzer

Luminosity production, 1380 bunches

adiabatically decrease emittance and increase beam intensity

Day

Summary

Link to report from morning meeting
Monday 25th July    8:30 meeting
Sunday 24th July 
  •   Fill 1970 - 1974
    • hours in stable beams: 1:37+1:08+0:46+0:00+5:15
    • Luminosity: 9.5+6.2+4.4+0+25.5 pb-1
  • beam dumps by:
    • Vacuum spike 4L8
    • Controller IT5 - Possible SEU
    • Cryo – R1 24V supply - Possible SEU
    • QPS communication problem
    • Electrical network glitch
9:00 meeting
Saturday 23rd July
  • Fill 1967 11:26 hours in stable beams; luminosity delivered: 42 pb-1; dumped by cryo
  • Fills 1968 - 1971: total of 3:31 hours in stable beams; luminosity delivered: ~20 pb-1; dumped by:
    • 2 time BLM TCTVB.4L8 due to vacuum activity
    • EDF electrical network glitch
    • Cryo sector 56
 9:00 meeting
 Friday 22nd July
  • 14:30 - 23:01 fill 1966 stable beams: 2.3 – 2.4 microns into collisions, 1.57e14 total per beam, 1.14e11 per bunch, ~ 1.55e33 cm-2s-1
  • PS/LEIR intervention and Booster MPS problem
  • 02:00 fill 1967 stable beams: bunch currents ~1.11e11, Initial luminosity ~1.45e33
  • beam aborts/interlocks: cryo intervention,  CMS BCM2, RF HOM temperature, ventilation doors communication.
8:30 meeting
Thursday 21st July
  • Fill 1962 for 15:26 hours in sable beams; luminosity delivered 46/44 pb-1
  • switching e-cloud solenoids off for cleaning
  • no beam from SPS (MKD problem 17:30 - 22:30)
  • beam abort/interlocks give by: CMS BCM (no data on both optical lines for 2.5s); RF spark; injection losses B1 MSIB; QPS on RQTF.A67B1 (tune feed-back during squeeze); communication lost of ventilation doors; power converter RCBXH1.R1
8:30 meeting
Wednesday, 20th July
  • Back in business after access for DFB controller fix (possible SEU)
  • 12:50 Stable beam - fill 1961 - initial lumi > 1.4e33
  • 15:00 fill 1961 lost to worldFIP repeater problem in sector 81
  • Access required
  • Back in Stable beam by 22:30 - fill in overnight
 8:30 meeting
Tuesday, 19th July
  • beam back during the evening/night

8:30 meeting
Monday, 18th July
  • 03:42 Fill #1955, 1092b, stable beams
  • 09:50 Beams dumped, trip of RQTL7.L7B1
  • Fills #1956 - #1958, 1380b: 20 minutes stable beams
  • 22:39 cryo lost: beam back Tuesday evening/night

8:30 meeting