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    User name Cusanno

    Log entry time 22:43:13 on May23,2004

    Entry number 122549

    keyword=RICH 2050 V vs 2000 V

    run 1069: 2050V/400V, MIP peak at 250 ch, 10.5 'good' clusters, 1.65 size, average charge 38.8, pion resolution 5.9 mrad,
    proton (?) resolution 12.6 mrad

    run 1076: 2000V/400V, MIP peak at 150 ch, 7.9 'good' clusters, 1.45 size, average charge 27.4, pion resolution 6.4 mrad,
    proton (?) resolution 13.1 mrad

    The efficiency (events with at least one p.e. cluster) at 2000 V is comparable with 2050 V, the efficiency ratio is 99.1%

    My conclusions: at 2000 V RICH can operate pretty well but a lost of performance is already observable, I do not suggest to operate at lower HV than 2000 V.