<html><head><title>L-HRS: Cerenkov ADC overfload. Need to recude the HVs</title></head><body>
<p>Link: <a href="http://www.jlab.org/~adaq/halog/html/1103_archive/110324104317.html">http://www.jlab.org/~adaq/halog/html/1103_archive/110324104317.html</a></p>
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<a name="353058"><h4>User name yez</h4></a>
<h4>Log entry time 10:43:17 on March 24, 2011</h4>
<!-- Actual time: Thu Mar 24 10:43:17 EDT 2011 on hallaweb.jlab.org from 129.57.64.80, version HAweb1.13 -->
<h4>Entry number 353058 </h4>
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keyword=L-HRS: Cerenkov ADC overfload. Need to recude the HVs<br>
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<p>It looks like all Left Cerenkov channels have overfload, so many
electrons with high signals go to low ADC channels and mix up with pion,
hence cause the low efficiency as I mentioned yestoday.</p>
<p>Currently the Single Electron Peaks are aligned to 300 channels so we can
reduce the HVs of them by aligning the peaks to 150 channales. I have the
new values bellow so if nobody disagree, I am going to reduce the HVs. </p>
<p>#Ped HV_old HV_new
Cer#0 -1752.0 -1687.2
Cer#1 -1800.0 -1618.9
Cer#2 -2001.0 -1789.9
Cer#3 -1571.0 -1434.5
Cer#4 -1926.0 -1762.1
Cer#5 -1651.0 -1565.0
Cer#6 -1650.0 -1518.3
Cer#7 -1999.0 -1932.7
Cer#8 -1840.0 -1801.4
Cer#9 -1750.0 -1654.3
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A copy of this log entry has been emailed to: halla_src@jlab.org, bogdanw<br>
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