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<p class="MsoNormal"><span style="font-size:14.0pt">Hi Stepan,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Personally, I have no objections to go from 250 to 300 MeV in the PCAL+ECAL sum.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">It is true that RG-A used 300 MeV most of the time. However, when the energy of the machine went down to 10.2 GeV this parameter was set to 250 or even 200 MeV. See attached table. But I want to ask: do we
want to go to 45 or 50 nA? Until this decision we still have time to discuss.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt">Valery<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:14.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Clas12_rgb <clas12_rgb-bounces@jlab.org> on behalf of Stepan Stepanyan <stepanya@jlab.org><br>
<b>Date: </b>Saturday, December 7, 2019 at 7:56 PM<br>
<b>To: </b>Daria Sokhan <daria@jlab.org>, "clas12_rgb@jlab.org" <clas12_rgb@jlab.org>, Sergey Boyarinov <boiarino@jlab.org>, Nathan Baltzell <baltzell@jlab.org><br>
<b>Subject: </b>Re: [Clas12_rgb] [EXTERNAL] Electron trigger thresholds<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Dear all,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">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. <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Regards, Stepan<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="color:black">From:</span></b><span style="color:black"> 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</span> <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Dear all, <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Our current physics production is at 40nA and we have:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">* total trigger rate of 22kHz <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">* electron rate of 16kHz.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">* muon rate comparable with spring running.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span 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:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">* HTCC nphe > 2<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">* PCAL Emin > 60 MeV<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">* PCAL + ECAL Esum > 250 MeV<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span 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!<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Many thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif">Daria<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Verdana",sans-serif"><o:p> </o:p></span></p>
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