Raising voltages by 200 V on the LTOF#1 improved the "efficiency" - from
70% I saw earlier for overnight runs 1484 and 1485 to 85% for run 1589.
It is obviously not a voltage issue (or not only).
I put ADC cuts on the small paddle corresponding to LTOF#1 (for overnight
runs, before raising voltages) and the efficiency was between 95-98%,
depending on cut.
It is obvious we are getting a lot of accidentals with this method, due to
noise in the small paddles' and start counter's PMTs.
I will investigate further, with the hope that without raising voltages,
just by eliminating noise we get a decent number for efficiency.
Too bad that we do not get triggers at all for LTOF0, 14, 15 (due to start
counter coverage and cross section?!).
Adrian
-------------------------------
Adrian Sindile
Research Assistant
Nuclear Physics Group
University of New Hampshire
phone: (603)862-1691
FAX: (603)862-2998
email: asindile@alberti.unh.edu
http://einstein.unh.edu/~adrian/
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