NEXT
Make New Entry,
Make Followup Entry
User name flay
Log entry time 14:50:34 on March 10, 2009
Entry number 265554
keyword=LHRS Gas Cerenkov
I've been working on the calibration of the pion rejector, and looking at
the Cerenkov, I have noticed some strange behavior. In figure 1, you
will see a sharp peak at ~5000 channels for each PMT. This shows up in
the Cerenkov sum plot as a broad distribution around channel 5000.
Patricia pointed out to me that this signal is for those particles that
do not trigger the Cerenkov, but rather are particles that trigger the
other detectors. So this peak is a matter of book keeping of all events
that trigger at least one detector. My concern is that this peak is not
consistent for all the individual PMTs. I have a feeling that this may
hinder some events at the higher end of the spectrum. To account adjust
for this, I made a plot (see Figure 2) of the Cerenkov sum with cuts on
those peaks for each individual PMT (shown in blue). This I consider to
be the 'true' Cerenkov spectrum.
Is there any way of adjusting this peak to be consistent with all PMTs at
a much higher channel, so that it won't affect the true statistics?
A copy of this log entry has been emailed to: meziani,brads,posik
Figure 1
cer_indiv_chain.ps
Figure 2
cer_sum_chain_cer-indiv_cut.ps