GeN Meeting: 13-Dec-2006

• Basic documentation for Neutron-detector event reconstruction and analysis, found on the wiki article here
• I've developed another method for measuring the electronic dead-time, independent of the DAQ deadtime. The background is:
  1. The "T7"'s were our pulser events, which ran at ~8Hz, and generated signals which were input into the ND-sum and BB-shower modules, such that each T7 should create an associated T3 with a definite time-relation.
  2. By looking at the TDC containing the copy of the trigger-inputs into the Trigger Supervisor, the relative timing of the different triggers can be measured.
  3. To calculate the electronic deadtime, count the number of T7's in the TDC over a run, and the number of T7's in tight coincidence with T3's. Build the ratio:
     LT_electronic = N(T3 matching T7) / N(T7)
  4. This is calculated independent of if the T7 actually was the real "trigger" for the event.
     
     This gives an electronic livetime of ~84%, lower than the previous estimate but (I would argue) more defendable and easier to interpret than trying to correlate with scaler readings.
• Brandon's status page