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Muon Piquet Report week 24. Burkhard Schmidt Diego and Patrizia kindly served as piquet on June 18 and 19. Many thanks!. LHC Status Mo Morning 20 -June. 7 runs. LHC Status Run Statistics 13- 20 June. Main Delays: Cryo injection oscillations / losses - PowerPoint PPT Presentation
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Muon Piquet Report week 24Burkhard Schmidt
Diego and Patrizia kindly served as piquet on June 18 and 19. Many thanks!
LHC Status Mo Morning 20-June
7 runs
Ldt 133.136 pb 1
LHC Status Run Statistics 13-20June
Fill delivered LuminosityATALS/CMS
delivered Luminosity
LHCb
End of fill run length Reason for Dump
1866 1306 176 Mon 13 10:57 0:20h RF
1867 29342 8802 Mon 13 21:52 8:26h RF
1868 46929 17967 Tue 14 22:39 15:09h 400V distribution
1871 23770 8911 Thu 16 14:53 7:30h Main Quads 81
1873 3326 740 Fri 17 02:08 0:54h BIS
1875 25291 7825 Fri 17 14:05 7:50h Undulator
1880 3172 635 Sat 18 07:50 0:50h BIS
Sum 133.1/pb 45.1/pb
Main Delays: Cryoinjection oscillations / losses
Fills 1868 and 1871 used by LHCb for studies with higher luminosities
LHCb Luminosity
Running the detector at 3.5 x 1032/cm2/sFill 1868
• During data-taking at a luminosity of 3.4-3.5 x 1032/cm2/s we had 10 trips, and 11 in total during fill 1868.
Given the increase in luminosity this is rather normal.No problems with system operation.
Running the detector at 4 x 1032/cm2/sFill 1871
• The Muon System did not show problems and only a five trips occurred.
• Currents on GEM A17A2 R/L reached the values of about 7400 nA, three more GEM chambers exceeded the value of 5000 nA.
All in all, pretty good.
Intervention on Thursday (Access)
Was very successful: • four HV RDB-boards replaced:
– RDB#4 by RDB#12 - M2C DOWN, – RDB#11 by RDB#30 -M2C UP, – RDB#53 by RDB#52 and – RDB#55 by RDB#67 - M5A UP.
• Gap in the muon chamber (M5R4 on A-side) with short circuit inside has been disconnected from HV-system (jumper removed from PP),
• In addition, we swapped SYNC chips inside of ODE board (R41 on M1A) in order to better understand the problem with L0-MUON data mismatches.
SYNC problem in M1A is fixed
… but timing for one ODE in M1R4 not optimal
Muon System Status Friday 17/06
• A check of the replaced HV-boards (RDBs) revealed that we have no radiation problems there; however, the chambers connected to the boards need more conditioning.
• The number of gaps tripping in the fill 1875 is less than usual (only 2 in nearly 6 hours). Maybe the running at higher lumi on Tuesday and Thursday was beneficial...
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