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Since correction-I we got 122/pb, the average LED signal in the HCAL centre had decreased by >2%.

HCAL HV update – II, 23/05/2012, after fill 2651. More details in http://lblogbook.cern.ch/CALO/2103. Since correction-I we got 122/pb, the average LED signal in the HCAL centre had decreased by >2%. Correction-II: reference: fill 2583, CaloDAQCalib-114322-20120503T020756.root

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Since correction-I we got 122/pb, the average LED signal in the HCAL centre had decreased by >2%.

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  1. HCAL HV update – II, 23/05/2012, after fill 2651 More details in http://lblogbook.cern.ch/CALO/2103 Since correction-I we got 122/pb, the average LED signal in the HCAL centre had decreased by >2%. Correction-II: reference: fill 2583, CaloDAQCalib-114322-20120503T020756.root correction: fill 2651, CaloDAQCalib-116174-20120522T215301-EOR.root check: fill 2657, CaloDAQCalib-116264-20120524T004505-EOR.root the correction sample was selected ~6 hours before the actual end of the fill 2651 (the calibration farm was not operational for the rest of the fill), ~7 pb-1 not taken into account (~0.15%, negligible); the “check” sample was taken at the next long fill (PMT gains take time to stabilize) check-II HV update-I check-I correction-I HV update-II reference correction-II

  2. HCAL HV update – II, deviation from reference corr / ref check / ref The reference LED amplitudes successfully restored after the correction

  3. HCAL HV update-II : L0Had / L0Mu (Regis Lefevre) http://lblogbook.cern.ch/L0+Trigger/1411

  4. HCAL HV update-III Since HV update-II, ~70 pb-1 delivered. The HCAL HV is proposed to be updated again today, but the only reason is the magnet polarity change. The gain drift in the HCAL centre is ~1.3% for the moment, no significant trigger rate drop seen. Therefore no significant change expected. HV update-I HV update-II HV update-I HV update-III ? HV update-II tech. stop tech. stop

  5. spares

  6. ECAL gain drift LED response drift in the matching ECAL area, in the same time interval. One can see ~7% reduction of LED signal by now, and looks stabilizing. In principle, the ECAL HV should be corrected as well. Unfortunately the ECAL PMT gain reduction cannot be directly extracted from LEDs, because of the radiation damage of clear fibers used for the LED light transport. The work is ongoing on determining the ECAL correction procedure.

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