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ECAL HV adjustment (1)

ECAL HV adjustment (1). Irina Machikhiliyan , 29.08.2012. Input parameters: C1 : coefficients presently used in reconstruction ( coeff_118753_118880, provided by MN) C2 : π ⁰ calibration latest (July, CalibCoefficientsJul2012.txt, provided by Dasha )

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ECAL HV adjustment (1)

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  1. ECALHV adjustment (1) Irina Machikhiliyan, 29.08.2012 • Input parameters: • C1:coefficients presently used in reconstruction (coeff_118753_118880, provided by MN) • C2: π⁰ calibration latest (July, CalibCoefficientsJul2012.txt, provided by Dasha) Coefficient for HV correction: C = C1 * C2 To avoid dramatic changes: - if C > 2. then C = 2. - if C < 0.5 then C=0.5

  2. ECAL HV adjustment (2) Irina Machikhiliyan, 29.08.2012 C1 (presently used in reco) C2 (July π⁰ )

  3. ECAL HV adjustment (3) Irina Machikhiliyan, 29.08.2012 C2 (July π⁰ ) C1 (presently used in reco) C1 vs C2 correlation plot

  4. ECAL HV adjustment (4) Irina Machikhiliyan, 29.08.2012 Final correction C = C1*C2 Correction Limit (few cells around beam pipe, which cannot be calibrated correctly anyway)

  5. ECAL HV adjustment (5) Irina Machikhiliyan, 29.08.2012 Ratio HV(new) / HV(old) PmPin(new HV) / PmPin(old HV) New HV settings were tested with LED system: current settings: saveSet for run #126717 new settings: saveSet for run #126718 HV consumption change (no LED, no beam): Old New C 1.0931 A 1.1013 A A 1.0914 A 1.1016 A Not a big change New HV settings are uploaded in ORACLE DB. They can be transferred to HV project recipes (Yuri) as soon as Oliver will reset gain corrections for HLT

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