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ECAL HV Tuning for Improved Performance

Detailed analysis of ECAL HV tuning process to optimize performance parameters, including PmPin ratios and LED intensity adjustments. Calibration and system checks ensure accurate detector timing for enhanced results.

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ECAL HV Tuning for Improved Performance

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  1. ECAL: HV tuning Irina Machikhiliyan, 21.03.2012 • Input parameters: • π⁰ calibration latest (corresponds to the run #102323, 25 Sept 2011, provided by MN) • Outer border cells: PmPin ratios • Cells with changed Pm/C-W are excluded • New HV test (5 TAE, 11 KHz ON): • run #108978 (10K) – old HV • run #108982 (10K) – new HV + LED intensity tuned • MV consumption change (per side): 1.116A → 1.126A (No beam, no LED flashing)

  2. ECAL HV adjustment test Irina Machikhiliyan, 21.03.2012 K1 = required gain change HV(new) / HV (old) K1 – required gain change ( input parameter) K2 = PmToPin(new HV) / pmToPin(old HV) - measured gain change after HV adjustment K1 / K2 K1 / K2 I 25/41 ( k1 = 1.35)

  3. LED system time alignment (#108982) Irina Machikhiliyan, 21.03.2012 P1 / (P1+T0+N1) P1 / (P1+T0+N1), averaged over LED N1 / (P1+T0+N1) N1 / (P1+T0+N1), averaged over LED Timing is acceptable, but it would be better to make a tuning (after detector timing is checked with TAE events)

  4. Irina Machikhiliyan, 21.03.2012 Further steps • FEB fine delays check/tuning to account for new HV (m.p. done by Frederic) • Calibration constants reset (m.p. done by Olivier) • Detector timing check with TAE • Final tuning of LED/PIN timing

  5. Irina Machikhiliyan, 21.03.2012 Extra

  6. Irina Machikhiliyan, 21.03.2012 PmPin change during the shutdown (1) PmPin(12 Mar)/PmPin(30 Oct) Reference runs: #104406 (beginning of the fill 2267, 30 Oct 2011) # 108978 (12 Mar 2012)

  7. Irina Machikhiliyan, 21.03.2012 PmPin change during the shutdown (2) PmPin(12 Mar)/ PmPin(30 Oct), Middle PmPin(12 Mar)/ PmPin(30 Oct), Inner Average recovery is on the level of 8÷13%, strongly depends on the detector area (up to 25% in the “horns”) PmPin(12 Mar)/ PmPin(30 Oct), Outer

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