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    User name Kirsten and Darcy

    Log entry time 16:23:39 on June15,2004

    Entry number 125864

    keyword=dark current of scanner PMT

    Upon examining the dark current regions behind the elastic peaks on each spectrometer arm, it was decided that the PMT on the right arm is better.  
    From the histograms of the voltage signal in these regions: (see plots below)
    Right arm-  Mean: 2.323e+04  RMS: 117.8
    Left arm-   Mean: 267.1      RMS: 63.95
    There is significantly less noise on the right arm PMT.  The same PMT has been ordered for the left arm.

    FIGURE 1

    FIGURE 2