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    User name V. Sulkosky

    Log entry time 22:13:00 on February 7,2009

    Entry number 259582

    keyword=Left HRS PID Plots

    The attached plots are for run 20082, which was a low pressure nitrogen reference cell run (600 Torr). The first figure shows the
    gas Cerenkov corrected ADC sum. The second figure the pion rejector
    total energy over momentum. Clearly we have very few electrons,
    though we are using an almost empty reference cell. The expected
    electron rate is only about 0.25 Hz with the left HRS at 0.6 GeV/c
    and 45 degrees.

    The left HRS detectors appear to be performing well. I will check
    the HV matching when we go to first pass tomorrow, though it still
    looks reasonable from the Transversity settings.

    FIGURE 1

    FIGURE 2