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User name gjin
Log entry time 12:34:50 on May 11, 2009
Entry number 272568
keyword=MWDC HV and threshold scan (results are preliminary)the first picture is background rate. since most of them are around 200kHz for different HV's and thresholds, we don't need to worry about them that much.
the second picture is hit efficiency. This is just a preliminary result, since I forgot to put ADC cuts in replay. So the cuts here are just coincidence cut (inc/ trigger type and coincidence timing).
People were using 3.5V and 4.4V in transversity, and I was recommended to
use 2.5V and 4.5V. But chamber 2 does not perform that well with 4.5V,
except at -1600V. However, I did not scan chamber2 for thresholds less
than 4.5V. So I guess I can take a short run after our experiment begins,
to lower the threshold to 3.5V to see what happens. Otherwise we can just
run chamber 2 at -1600V for satisfying hit efficiency.
A copy of this log entry has been emailed to: doug, brads
Figure 1
Figure 2
