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

    User name V. Sulkosky

    Log entry time 22:02:31 on May 07, 2009

    Entry number 271586

    This entry is a followup to: 271573

    keyword=Re: multiple pulsing T1,T2

    Following Bob's suggestion, I plugged triggers T1 through T8 into an <br>
    multi-hit 1877 TDC in slot 12 of ROC 2, channels 16-31. I updated the <br>
    db_D.dat file to reflect the addition of these signals. Here is the <br>
    trigger map and variable names in the ROOT tree: <br>

    <pre>
    Trigger TDC Channel Variable
    +++++++++++++++++++++++++++++++++++++
    T1 16 RTrigT1
    T2 17 RTrigT2
    T3 18 RTrigT3
    T4 19 RTrigT4
    T5 20 RTrigT5
    T6 21 RTrigT6
    T7 22 RTrigT7
    T8 23 RTrigT8
    </pre>

    I did a cursory check with T1 and T2 with cosmics. It does seem that <br>
    about 5-6% of the T1 events have multiple hits in TDC. T2 was less <br>
    conclusive, but the deadtime with only T2 and all other triggers
    prescaled was less<br>
    than I saw this afternoon, at 16%. I also saw in a short run that about
    7% of <br>
    T2 events had multiple hits. <br>

    A copy of this log entry has been emailed to: rom,doug,jpchen,yqiang,jiang,rsubedi,zhaobo