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Just one comment on the SR (synchrotron radiation) question. It probably comes from the fact that SR is a big problem at the EIC to shield against. The difference to CLAS12 experiment is that our beams are say 100nA, while the EIC has electron beams of 3 A, <span style="color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; background: var(--white);">i.e.
factor 3x10^7 difference. </span></div>
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Volker</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Rgc <rgc-bounces@jlab.org> on behalf of Kuhn, Sebastian E. <skuhn@odu.edu><br>
<b>Sent:</b> Wednesday, September 23, 2020 8:44 AM<br>
<b>To:</b> rgc@jlab.org <rgc@jlab.org><br>
<b>Subject:</b> [Rgc] Fwd: [EXTERNAL] additional info on RGC</font>
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<div class="" style="word-wrap:break-word; line-break:after-white-space">Dear all,
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<div class="">I JUST received this feedback from a PAC member (presumably our reader?) for the RG-C jeopardy review. It should be obvious that this kind of information cannot be produced in time with 48 hours to go, but I am asking all of you if you have any
studies that you can quote/summarize in 1 slide for your favorite channel to address her question. </div>
<div class=""><br class="">
</div>
<div class="">I can probably dig up the JAM study we did way back when we looked at increasing the time approved for deuterium for the inclusive channels. So I’ll cook something up about that. I can also look at the W results, but I am pretty sure that they
will have minimal overlap with the region x = 0.1…0.8 where our data will have the highest impact. For DVCS, it might be good if we had a comparison how the polarized target data improve on what we can extract with unpolarized target only.</div>
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<div class="">Chris, maybe it would be helpful to have a 1-slide schedule for the remaining target work. I believe we should stick with “dress rehearsal Fall 2021” as the present accelerator schedule shows other experiments running until October next year anyway.
Then we can say that we will be ready to install ANYTIME right after that. </div>
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<div class="">I believe the issue with “SR” (she probably means synchrotron radiation) is a red herring as the target field is along the beam direction and the beam, even if rastered, will be parallel to the z-axes.</div>
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<div class="">Anyway, I’m looking for updating my slides this afternoon (mostly with backup slides to address these questions) so ANY feedback you can give me until, say, 2 p.m. today would be MUCH appreciated.</div>
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<div class="">- Sebastian<br class="">
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<span class="" style="color:rgba(0,0,0,1.0)"><b class="">From: </b></span><span class="" style="">Aschenauer Elke-Caroline <<a href="mailto:elke@bnl.gov" class="">elke@bnl.gov</a>><br class="">
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<span class="" style="color:rgba(0,0,0,1.0)"><b class="">Subject: </b></span><span class="" style=""><b class="">[EXTERNAL] additional info on RGC</b><br class="">
</span></div>
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<span class="" style="color:rgba(0,0,0,1.0)"><b class="">Date: </b></span><span class="" style="">September 22, 2020 at 10:30:37 PM EDT<br class="">
</span></div>
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<span class="" style="color:rgba(0,0,0,1.0)"><b class="">To: </b></span><span class="" style=""><a href="mailto:kuhn@jlab.org" class="">kuhn@jlab.org</a>, Diehl Markus <<a href="mailto:markus.diehl@desy.de" class="">markus.diehl@desy.de</a>>, "Paschke, Kent
Dieter (kdp2c)" <<a href="mailto:paschke@virginia.edu" class="">paschke@virginia.edu</a>><br class="">
</span></div>
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<span class="" style="color:rgba(0,0,0,1.0)"><b class="">Cc: </b></span><span class="" style="">Aschenauer Elke-Caroline <<a href="mailto:elke@bnl.gov" class="">elke@bnl.gov</a>><br class="">
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<div class="">Dear Sebastian,</div>
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<div class="">I hope all is well with you and your loved ones in this crazy times.</div>
<div class="">I’m looking for some additional information for the RGC measurements.</div>
<div class="">Can you provide me with impact studies on the different measurements to constrain the helicity quark distributions, </div>
<div class="">TMDs and GPDs. I’m looking for studies like done for the EIC were pseudo-data of the experiment are integrated in a PDF fit/extraction.</div>
<div class="">For all of this impact studies it would be nice to have them based on modern PDFs, especially for the helicity PDFs the RHIC W data should be included. </div>
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<div class="">In addition I would like to see a schedule for the target construction, to understand if really everything is include the experiment could run in 2021.</div>
<div class="">And last but not least, you discuss in detail the moeller background, but I’m surprised there is no discussion about SR </div>
<div class="">with a 5 T magnet and a beam, which is rastered, can you give me please some details on this.</div>
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<div class="">Thanks for any information you can provide</div>
<div class="">elke</div>
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