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RUN3 Cerenkov analysis (update)

RUN3 Cerenkov analysis (update). Kazuya Aoki Kyoto University Muon trigger meeting 2003-09-02. Outline. Electron energy spectra ( tunnel 15, 20 , IR) The cross section of [S1xS2xCxMuID1D] Compare the cross section with the DAQ limit. Cerenkov in the South Tunnel. 15deg. MuID wall.

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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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