muon piquet report week 24
DESCRIPTION
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 PresentationTRANSCRIPT
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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