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    User name Templon

    Log entry time 03:11:41 on June 2,2000

    Entry number 42828


    keyword=electron arm vdc problem

    Kozlov found funny VDC arm spectra. Electron arm, V1 plane. Symptom:
    resolution is bad (presumably this is the time difference (t1-t2)-(t5-t4) for
    five hit events), and efficiency is slightly but noticeably less. On second
    inspection, even U1 plane efficiency looks worse than U2 and V2 while
    U1 resolution is not noticably worse. As U1 and V1 share high voltage,
    this is an immediate suspect. Also, threshold setting is local and this
    might be responsible for problem with resolution in V1 plane. Please
    check this during access Friday AM.

    Problem has been around for a long time. Below are relevant plots from
    run 1597 (from graveyard shift June 1). A followup log entry will
    show the plots from this shift (graveyard June 2).

    FIGURE 1

    FIGURE 2