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RUN3 Cerenkov analysis (update)

This document details the findings from the RUN3 muon trigger meeting held at Kyoto University on September 2, 2003. It covers the analysis of electron energy spectra, including measurements from Tunnel 15 and Tunnel 20, as well as the cross-section calculations for the Cerenkov detectors under varying conditions. It highlights the importance of Cerenkov detection efficiency, the corrections applied, and the significance of DAQ limits. The analysis also discusses magnetic field effects and the need for shielding in certain configurations.

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RUN3 Cerenkov analysis (update)

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  1. RUN3 Cerenkov analysis(update) Kazuya Aoki Kyoto University Muon trigger meeting 2003-09-02

  2. Outline • Electron energy spectra ( tunnel 15, 20 , IR) • The cross section of [S1xS2xCxMuID1D] • Compare the cross section with the DAQ limit.

  3. Cerenkov in the South Tunnel 15deg MuID wall Beam pipe 20deg The platform works as a shield

  4. Cerenkov in the IR • 12.5 deg • Strong magnetic field

  5. Al Al Cerenkov IP SC4 SC1 RUN3 private DAQ analysiselectron energy spectra O : hit X : no hit • Cross section (E=20~29) Counts(S1xS2xCxS3xS4) Luminosity x 9(the width of the bin) d(sigma)/dE(E=20-29) =

  6. RUN3 private DAQ analysiselectron energy spectra • Luminosity • BBCLL1 raw trigger count was used. • Some corrections • Cerenkov efficiency correction(eff = 0.63) • The ratio of raw and live trigger count • MuID 1D signal correction • If PHENIX DAQ stops the MuID 1D signal also stops. • The count was multiplied by • Error • Only statistical errors are shown The duration of “PHENIX DAQ on” during the (privateDAQ)run [sec] The duration of the (privateDAQ)run [sec]

  7. RUN3 private DAQ analysisElectron energy spectra • The upper edge is arbitrary IR Tunnel 15 Tunnel 20

  8. RUN3 private DAQ analysisElectron tolerable level 13m • Tolerable cross section • The DAQ bandwidth corresponds to [??] nbarn • numbers • L = 2x1032/cm2/sec = 0.2 / nb / sec • L x sigma = 2 kHz (DAQ bandwidth for muons) • Sigma (MuID) = 10000nb • Area(MuID/cerenkov) ~ 3200 (should be confirmed experimentally) • Sigma(at Cerenkov) ~ 3nb • Cerenkov test@20 deg • Below tolerable level • Cerenkov test@15 deg • We need shield. • Cerenkov test@IR (12.5deg) • Quite high rate. • There’s strong magnetic field. Can we use PMT? 10m MuID Cerenkov window R = 4.5 inch~11.4cm nb 3nb 20deg 15deg IR

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