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Evaluation of ECAL PM/PIN Performance: Issues and Adjustments (April 2012)

This report, authored by Irina Machikhiliyan on April 25, 2012, discusses the performance of the ECAL PM/PIN system during runs 111148 and 113146, analyzing the inconsistencies in LED performance and timing. Key issues include the irregular operation of LED A107.1, necessary high voltage adjustments, and tuning of the LED system. Data was collected across fills 2469 to 2536. The evaluation presents average relative PM to PIN changes against reference runs, aiming to detail the system performance and adjustments needed for optimal data collection.

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Evaluation of ECAL PM/PIN Performance: Issues and Adjustments (April 2012)

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  1. ECAL technical stop activities Irina Machikhiliyan, 25.04.2012 PmPin(111148) / PmPin(108982) PmPin(111148) / PmPin(108982) (1) LED A107.1: big r.m.s., does not work from time to time → to be replaced (2) Another HV change (by request of MN) including the collection of LED reference samples before / after (3) The tuning of LED system timing (see plots): Run #108982 (12 Mar): reference after HV-adjustment for 2012 (in-between) CROCK delay shift in the crate 13 (hosts all LEDTSB units for ECAL C) Run #111148 (5 Apr): start of more-or-less regular data taking

  2. Irina Machikhiliyan, 25.04.2012 ECAL, PM/PIN, fills 2469 – 2514, All Average relative PmToPin change with respect to the ref. run 111148(fill 2469, 05/04/2012) #111148 fill 2469 05/04/12 #113146 fill 2536 20/04/12 Red: physics runs Black: the rest Time, minutes. One point per run

  3. Irina Machikhiliyan, 25.04.2012 ECAL, PM/PIN, fills 2469 – 2514, Inner Average relative PmToPin change with respect to the ref. run 111148(fill 2469, 05/04/2012) #111148 fill 2469 05/04/12 #113146 fill 2536 20/04/12 Red: physics runs Black: the rest Time, minutes. One point per run

  4. Irina Machikhiliyan, 25.04.2012 ECAL, PM/PIN, fills 2469 – 2514, Middle Average relative PmToPin change with respect to the ref. run 111148(fill 2469, 05/04/2012) #111148 fill 2469 05/04/12 #113146 fill 2536 20/04/12 Red: physics runs Black: the rest Time, minutes. One point per run

  5. Irina Machikhiliyan, 25.04.2012 ECAL, PM/PIN, fills 2469 – 2514, Outer Average relative PmToPin change with respect to the ref. run 111148(fill 2469, 05/04/2012) #111148 fill 2469 05/04/12 #113146 fill 2536 20/04/12 Red: physics runs Black: the rest Time, minutes. One point per run

  6. Irina Machikhiliyan, 25.04.2012 ECAL, PM/PIN, fills 2469 – 2536 PmPin(20 Apr)/PmPin(5 Apr) Reference runs: #111148 (5 Apr 2012) # 113146(20 Apr 2012)

  7. Irina Machikhiliyan, 25.04.2012 ECAL, PM/PIN, fills 2469 – 2536 PmPin(20 Apr)/ PmPin(5 Apr), All PmPin(20 Apr)/ PmPin(5 Apr), Inner PmPin(20 Apr)/ PmPin(5 Apr), Middle PmPin(20 Apr)/ PmPin(5 Apr), Outer

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