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...

HV

- Sta

tus

HV

- Sta

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