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Archived Messages for CLAS_DRIFT_CHAMBERS_1997@cebaf.gov: de-mux analysis

de-mux analysis

David Tedeschi (tedeschi+@pitt.edu)
Wed, 12 Mar 1997 10:39:56 -0500 (EST)

Dear Drifters,
In Pittsburgh I am concentrating on the de-multiplexing issues of the
drift chamber signals. I am looking at the 1,2,3, and 4 edge cases for
all three regions. A more involved analysis will follow as well as a
corrected DC0 bank. But I wanted to mention a few points now for the DC
analysis meeting and just in case someone else is doing the same work.

1 edge cases:
these look as one would expect except for crate 6 (region 1) slot 6
channel 47 (should be checked).

2 edge cases:
I have seen some widths that are not within the jitter tolerance of the
ADB's. I need to do more analysis on this to be more specific. Is anyone
else looking at this?

3 edge cases: (PRELIMINARY)
There are more three edge cases in the runs after we minimized the TDC
window. Also as a result, the number of registered double pulses
decreased. These two effects are related. With the window smaller, the
4th edge of a double pulse has a good chance of coming after the stop -
resulting in a three edge event. You can immediately see how these events
would effect the long drift times more that the short drift times -
causing a deficit of events in the tail of the tdc distribution. I am
looking into recovering these.

4 edge events
Except for double pulses - still needs to be looked at.

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| David J. Tedeschi |
| Department of Physics and Astronomy (Email) tedeschi+@pitt.edu |
| University of Pittsburgh (Phone) 412-624-9215 |
| Pittsburgh, PA 15260 (Fax ) 412-624-9163 |
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