• Main INDEX
  • Monthly INDEX
  • PREV
  • NEXT
    Make New Entry, Make Followup Entry

    User name V. Sulkosky

    Log entry time 22:58:25 on February 23, 2009

    Entry number 263013

    This entry is a followup to: 263001

    keyword=Re: strange s1 tdc?

    The S1 TDC is performing as it should be. For the current kinematics,
    there are quite a lot of junk events. The real physics rate is actually
    below cosmic rate. The majority of events do not even have a track,
    please see Figure 1.

    In Figure 1 and 2, I plot the S1 left TDC #2 with different cuts. The
    events at low TDC value are T4 events, which have a different timing than
    the T3 events. If I place a cut on track variables such as the relative
    momentum, then I loose almost all the remaining events. The second peak
    at larger TDC values are beta < 0 particles, i.e. cosmic events. The
    first peak are the real electrons in which we are interested.

    The estimated electron rate at this kinematic is 0.086 Hz.

    A copy of this log entry has been emailed to: jinhuang,xqian

    S1 PMT # 2 with Track Cut

    S1 PMT #2 with Trigger and Beta Cuts