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User name X. Zheng

Log entry time 15:45:01 on May 28, 2009

Entry number 277122

This entry is a followup to: 277117

keyword=more details

This entry provides additional information that:

1. this TDC channel corresponds to pion narrow trigger of group 1;

2. At the ANDing module (two inputs are the electron narrow or wide
trigger - called "signal", and a delayed tagger), the delayed tagger is
about 50ns wide and 10ns earlier than the signal, while the signal is
about 15-20ns wide. This information will be useful in calculating the
expected pile-up.

delayed tagger -----------                --------------------
                         |                |
                         |                |
                         |                |
                         |                |
                         ------------------
                         0                50ns
signal (en or ew) ------------      ---------------------------
                             |      |
                             |      |
                             |      |
                             |      |
                             --------
                             ~10ns  ~25(30)ns
   -----------------------------------------------------------------> time

A copy of this log entry has been emailed to: rsubedi@jlab.org