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<p class="MsoNormal">Hi Sean, <o:p></o:p></p>
<p class="MsoNormal">Thanks for the studies. It is pretty extensive and a lot of information to digest so probably I am still missing a few things, so maybe l can ask a couple of few points that might help clarify a little bit things.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">You use only 20 middles channels to calculate CM using the sorting method, meaning that you remove the 54 highest ADC channels and 54 lowest ADC channels from the calculation
<span style="font-family:Wingdings">è</span> Is that correct? If so, yes this will probably remove the negative pulse effect in almost all cases even though the precision of CM calculation will be strongly affected by definition<o:p></o:p></li></ol>
<p class="MsoListParagraph"><o:p> </o:p></p>
<ol style="margin-top:0in" start="2" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">What is the difference between the 2 plots of slide 2 in attached pdf. I see the same title in the y axis
<span style="font-family:Wingdings">è</span> is it typo where you meant Danning CM – baseline CM (on left) and sorting CM – baseline CM (on right), baseline meaning the CM calculated from pedestal data (ideal case?)
<o:p></o:p></li></ol>
<p class="MsoListParagraph"><o:p> </o:p></p>
<ol style="margin-top:0in" start="3" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">Do you actually have any evidence from the data of the voltage shift downward due to high occupancy and why is it an issue w.r.t to CM correction?
<o:p></o:p></li></ol>
<p class="MsoListParagraph"><o:p> </o:p></p>
<ol style="margin-top:0in" start="4" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">Even for the 7uA on LD2 data that you are showing, I don’t really see high occupancy data, and since you said that you analyzed data from only 1 MPD, did you select MPD reading out
data from the hottest area of the chamber? <o:p></o:p></li></ol>
<p class="MsoListParagraph"><o:p> </o:p></p>
<ol style="margin-top:0in" start="5" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">In my view, there are several aspect of what I mean by polarity flip.
<o:p></o:p></li><ol style="margin-top:0in" start="1" type="a">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo2">It looks to me like you are looking for a flip for a same strip across the 6 time sample. This is just one way, but very likely the most unlikely<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo2">On slide 1 of the attached pdf, you can clearly see an event with have both positive ADC strips and negative ADC strips on the same APV. The question is are the negative signal flip
or not? Unless these strips are always below the baseline (i.e. their pedestal level, which we al agree it is not the case), something makes them flip their ADC level w.r.t the baseline while there was good hit in other strips of the same APV<o:p></o:p></li></ol>
</ol>
<p class="MsoNormal"><o:p> </o:p></p>
<ol style="margin-top:0in" start="6" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">Even if there is never an actual signal flip, with your correct conclusion that the negative pulse occupancy increases in similar fashion than the positive one. I think regardless
whether we convince ourselves that signal can flip or not: <o:p></o:p></li><ol style="margin-top:0in" start="1" type="a">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo2">it is not correct to say that negative pulse does not cause the loss of positive pulse
<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level2 lfo2">there is a high probability that a good event hitting these strips might be lost (because of negative occupancy) and I think that is the scariest scenario.
<o:p></o:p></li></ol>
</ol>
<p class="MsoListParagraph"><o:p> </o:p></p>
<ol style="margin-top:0in" start="7" type="1">
<li class="MsoListParagraph" style="margin-left:0in;mso-list:l0 level1 lfo2">Most negative pulses have the same amplitude across time sample can be just due to saturation, there are actually some case where they have the typical APV signal waveform (see slide
3)<o:p></o:p></li></ol>
<p class="MsoListParagraph"><o:p> </o:p></p>
<p class="MsoNormal">Any way these are just a few questions I have after looking at the results you present.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best regards <o:p></o:p></p>
<p class="MsoNormal">Kondo<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b>From:</b> Sbs_gems <sbs_gems-bounces@jlab.org> <b>On Behalf Of
</b>Sean Jeffas<br>
<b>Sent:</b> Friday, February 18, 2022 4:31 PM<br>
<b>To:</b> Sbs_gems@jlab.org<br>
<b>Subject:</b> [Sbs_gems] [EXTERNAL] Negative Pulse Analysis Update<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Hi All,<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">I touched up my negative pulse analysis results that I showed to everyone last week. I realized I was making a serious mistake by simply cutting on signal > 80 ADC, because the first few strips in the APV always have large signals on them
from the event header. Therefore this was significantly skewing my data. I am now using the correct method of cutting using 5*sigma of the pedestal noise, as is done in the tracking analysis.<o:p></o:p></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Please see my new results in the following slides <a href="https://logbooks.jlab.org/files/2022/02/3984417/Neg_pulse_study_2_18_22.pdf">
https://logbooks.jlab.org/files/2022/02/3984417/Neg_pulse_study_2_18_22.pdf</a>. Also please take the time to look over all the plots in my log entry, <a href="https://logbooks.jlab.org/entry/3984417">https://logbooks.jlab.org/entry/3984417</a>. I try my best
to pick some event examples to show, but I encourage everyone to scroll through the event displays I have posted, to get an idea of what the negative pulses look like. Please let me know your thoughts and questions.<o:p></o:p></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Best,<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Sean<o:p></o:p></p>
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