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Hi Tegan and Zisis,<br>
<br>
It appears that the "hot" channels are only seen in the TDCs, which
means that it is likely the discriminator or the TDC signal that
feeds the discriminator. We will continue to monitor the channels
and determine their location. I would also like to see the rates
with beam. My recollection from last fall is that the behavior of
various "hot" channels changed with beam conditions. Mark thinks
that the individual discriminator channels have different thresholds
even when they are set to the same value, so a variation in the
threshold could account for some of this behavior. Switching cables
with neighbors could indicate the source of the high rates. Unless
the rate with beam affects the amount of data we are taking, we may
wish to simply live with this. <br>
<br>
Cheers, Elton.<br>
<pre class="moz-signature" cols="72">Elton Smith
Jefferson Lab MS 12H3
12000 Jefferson Ave STE 4
Newport News, VA 23606
(757) 269-7625
(757) 269-6331 fax </pre>
<div class="moz-cite-prefix">On 3/23/15 4:10 PM, Zisis Papandreou
wrote:<br>
</div>
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type="cite">
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Hi BCAL team:
<div><br>
</div>
<div>Tegan has run several investigations connected to the issue
of the handful of "hot scalers" on the BCAL. He does not see
evidence for this in the ADCs of TDCs, using the plugins
described below. </div>
<div><br>
</div>
<div>As Mark suggested during our last meeting, a cable swap can
would tell us whether it is the scalers that have the problem or
it is in the disciminator->TDC route.</div>
<div><br>
</div>
<div>Any other ideas? Can it be something in the plugins that
masks seeing the effect? We think not, but perhaps we overlooked
something.</div>
<div><br>
</div>
<div>Cheers and thanks, Zisis...<br>
<div><br>
<div>Begin forwarded message:</div>
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<div style="margin-top: 0px; margin-right: 0px;
margin-bottom: 0px; margin-left: 0px;"><span
style="font-family:'Helvetica'; color:rgba(0, 0, 0,
1.0);"><b>From: </b></span><span
style="font-family:'Helvetica';">beattite <<a
moz-do-not-send="true"
href="mailto:beattite@uregina.ca">beattite@uregina.ca</a>><br>
</span></div>
<div style="margin-top: 0px; margin-right: 0px;
margin-bottom: 0px; margin-left: 0px;"><span
style="font-family:'Helvetica'; color:rgba(0, 0, 0,
1.0);"><b>Subject: </b></span><span
style="font-family:'Helvetica';"><b>Hot Channels</b><br>
</span></div>
<div style="margin-top: 0px; margin-right: 0px;
margin-bottom: 0px; margin-left: 0px;"><span
style="font-family:'Helvetica'; color:rgba(0, 0, 0,
1.0);"><b>Date: </b></span><span
style="font-family:'Helvetica';">March 23, 2015 at
1:49:15 PM CST<br>
</span></div>
<div style="margin-top: 0px; margin-right: 0px;
margin-bottom: 0px; margin-left: 0px;"><span
style="font-family:'Helvetica'; color:rgba(0, 0, 0,
1.0);"><b>To: </b></span><span
style="font-family:'Helvetica';">Zisis Papandreou <<a
moz-do-not-send="true" href="mailto:zisis@uregina.ca">zisis@uregina.ca</a>><br>
</span></div>
<br>
<div>Using a version of the DAQTreeBCAL plugin, we don't see
increased number of events in the 'hot' channels from the
ADC (BCALdigi tree) or from the TDC (BCALTDCdigi tree).
The 'w_integral' (integral of the waveform) distributions
for the 'hot' channels compared to normal channels seem to
be indistinguishable. The waveforms, as well, look the
same.<br>
<br>
As Elton suggested, we might not see the effects of the
hot channels in the ADCs if there's something going on in
the TDC line. But, it is odd that the scalars see huge
rates for these channels while the TDC is not recording an
increased number of events if the input for both is coming
from the same discriminator.<br>
<br>
If we could do some cable-swapping tests like Mark
mentioned at the last meeting, that might be best for
trying to figure out what's happening.<br>
</div>
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<div><font
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Dr. Zisis Papandreou</font></div>
<div style="color: rgb(0, 0, 0);"><span
class="Apple-style-span"
style="font-size: 13px;"><font
class="Apple-style-span"
face="Verdana">Professor of
Physics, Ph.D., P.Phys.</font></span></div>
<div style="color: rgb(0, 0, 0);"><span
class="Apple-style-span"
style="font-size: 13px;"><font
class="Apple-style-span"
face="Verdana">---------------------------------------------------------</font></span></div>
<div style="font-size: 12px;
font-style: normal; font-weight:
normal;"><font
class="Apple-style-span"
color="#929292" face="Verdana">Department
of Physics </font></div>
<div style="font-size: 12px;
font-style: normal; font-weight:
normal;"><font
class="Apple-style-span"
color="#929292" face="Verdana">University
of Regina<span
class="Apple-tab-span"
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</font></div>
<div style="font-size: 12px;
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normal;"><font
class="Apple-style-span"
color="#929292" face="Verdana">3737
Wascana Parkway</font></div>
<div style="font-size: 12px;
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class="Apple-style-span"
color="#929292" face="Verdana">Regina,
SK S4S 0A2<span
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face="Verdana"><br>
</font></div>
<div style="color: rgb(0, 0, 0);"><font
class="Apple-style-span"
face="Verdana"><b>Phone: (306)
585-5379</b></font></div>
</div>
</span></div>
</span></div>
</span></div>
</span></div>
</span></div>
</span><span class="Apple-style-span" style="font-family:
Verdana; font-size: 12px;"><font
class="Apple-style-span" color="#929292">Fax: (306)
585-5659</font></span>
<div><span class="Apple-style-span" style="font-family:
Verdana; font-size: 12px;"><font
class="Apple-style-span" color="#929292">Email:</font> </span><a
moz-do-not-send="true" href="mailto:zisis@uregina.ca">zisis@uregina.ca</a></div>
<div>
<div style="word-wrap: break-word; -webkit-nbsp-mode:
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class="Apple-style-span" color="#929292"
face="Verdana">Website:</font> <a
moz-do-not-send="true"
href="http://kronos.phys.uregina.ca/%7Ezisis/professional/">http://www.uregina.ca/science/physics/faculty-staff/faculty/zisis-papandreou.html</a></div>
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