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Noise Reduction in CRAFT09: Improved HPD Performance Compared to CRAFT08

In CRAFT09, the noise in the High-Precision Detectors (HPDs) was reduced by approximately twofold compared to CRAFT08, achieving significant improvements at a 50 fC (≈10 GeV) threshold. During shutdown, the most problematic HPDs were replaced, and the high voltage (HV) for HB/HE was lowered from 7.5 kV to 7.0 kV, resulting in a roughly 12% decrease in gain. The mean noise rate measured in HB/HE excludes the seven noisiest HPDs that were replaced. Noise filtering techniques employed include pulse shape analysis, hit multiplicity, and timing adjustments.

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Noise Reduction in CRAFT09: Improved HPD Performance Compared to CRAFT08

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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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