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Dear all,</div>
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As it was pointed out, 250 MeV corresponds to ~1.5 GeV/c electron momentum. RG-A used 300 MeV - ~1.8 GeV/c. It seems sensible to go to 300 MeV threshold, unless someone has a strong argument for analysis with scattered electrons < 2 GeV/c momenta. No need to
collect data that will not be used and use computing resources for it. </div>
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Regards, Stepan</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Clas12_rgb <clas12_rgb-bounces@jlab.org> on behalf of Daria Sokhan <daria@jlab.org><br>
<b>Sent:</b> Saturday, December 7, 2019 3:52 PM<br>
<b>To:</b> clas12_rgb@jlab.org <clas12_rgb@jlab.org>; Sergey Boyarinov <boiarino@jlab.org>; Nathan Baltzell <baltzell@jlab.org><br>
<b>Subject:</b> [Clas12_rgb] [EXTERNAL] Electron trigger thresholds</font>
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<div class="x_gmail_default" style="font-family:verdana,sans-serif">Dear all, </div>
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<div class="x_gmail_default" style="font-family:verdana,sans-serif">Our current physics production is at 40nA and we have:</div>
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<div class="x_gmail_default" style="font-family:verdana,sans-serif">* total trigger rate of 22kHz </div>
<div class="x_gmail_default" style="font-family:verdana,sans-serif">* electron rate of 16kHz.</div>
<div class="x_gmail_default" style="font-family:verdana,sans-serif">* muon rate comparable with spring running.</div>
<div class="x_gmail_default" style="font-family:verdana,sans-serif"><br>
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<div class="x_gmail_default" style="font-family:verdana,sans-serif">Electron rate is very high -- the purity of the electron trigger will be checked as soon as the first production data files are cooked, but in the meantime we should revisit the trigger thresholds.
The electron trigger is currently as follows:</div>
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<div class="x_gmail_default" style="font-family:verdana,sans-serif">* HTCC nphe > 2</div>
<div class="x_gmail_default" style="font-family:verdana,sans-serif">* PCAL Emin > 60 MeV</div>
<div class="x_gmail_default" style="font-family:verdana,sans-serif">* PCAL + ECAL Esum > 250 MeV</div>
<div class="x_gmail_default" style="font-family:verdana,sans-serif"><br>
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<div class="x_gmail_default" style="font-family:verdana,sans-serif">The 250 MeV limit was brought up for discussion -- should be keep this, or raise it to 300 MeV? Please weigh in if you have any comments!</div>
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<div class="x_gmail_default" style="font-family:verdana,sans-serif">Many thanks,</div>
<div class="x_gmail_default" style="font-family:verdana,sans-serif">Daria</div>
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