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Hcal Noise in CRAFT09

Hcal Noise in CRAFT09. HPD noise reduced by factor ~2 in CRAFT09 vs. CRAFT08 (for a 50 fC ≅ 10 GeV threshold). Replaced noisiest HPDs during shutdown HB/HE HV lowered from 7.5 kV to 7.0 kV (decreasing gain by ~12%). * HPD mean noise rate in HB/HE for a 50 fC threshold

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Hcal Noise in CRAFT09

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  1. Hcal Noise in CRAFT09 HPD noise reduced by factor ~2 in CRAFT09 vs. CRAFT08 (for a 50 fC ≅ 10 GeV threshold) • Replaced noisiest HPDs during shutdown • HB/HE HV lowered from 7.5 kV to 7.0 kV (decreasing gain by ~12%) * HPD mean noise rate in HB/HE for a 50 fC threshold †7 noisiest HPDs are not included, and were replaced during the shutdown Noise-induced missing ET rate CMS Preliminary No Filter Loose Cuts Tight Cuts • Noise filter uses: • Pulse shape • Hit multiplicity • Timing

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