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    User name J Miller

    Log entry time 03:53:28 on March 21, 2006

    Entry number 167679

    This entry is a followup to: 167671

    Followups:

    keyword=Front End Efficiency

    I don't think the script is correct because it uses a timing cut on D.bit3. As is seen in some simple plots (see white folder in Counting House), D.bit3 does not have a true time spectrum (channels -> time is not a linear function). This was seen by comparing it to D.atimeT3, which was (it seems removed or renamed now) T3 into the BB TDC. The result of this is that D.bit3 should not be used to do timing cuts, rather some other variable should be used (I would suggest D.atimeT3, but it no longer appears to be in the database).

    The only thing that D.bit3 is useful for is to determine whether or not their is a coincidence event.

    Since I could not find the T.atimeT3 variable, I ran the script doing a cut just on whether a T.bit3 event was also a T.bit7 event. Doing this we find that the front end efficiency is 100%.