<div dir="ltr"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>Hi Justin,</div><div><br></div><div>According to my understanding there are two different run periods</div><div><br></div><div>- this fall which will allow to cover 4-9 GeV or so. CLAS6 does not have pol measurements</div><div><br></div><div>- next summer which is a low energy run which you spelled out. that is different story</div><div><br></div><div>Cheers, igor</div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Oct 17, 2018 at 1:15 PM Justin Stevens <<a href="mailto:jrsteven@jlab.org">jrsteven@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space">Hi Igor,<div><br></div><div>Thanks for your feedback. My understanding is the accelerator would run at half energy (Ee ~ 5.5 GeV), and as usual we could choose to set the coherent peak as we prefer. The hodoscope in this case would cover Eg ~ 1.5 GeV to the endpoint, although it will still be only half instrumented (sampling) between 1.5 and 3.5 GeV. So data below Eg = 4 GeV could be possible in this scenario, but at a lower efficiency.</div><div><br></div><div>-Justin<br><div><br><blockquote type="cite"><div>On Oct 15, 2018, at 3:11 PM, Igor Strakovsky <<a href="mailto:igor@gwu.edu" target="_blank">igor@gwu.edu</a>> wrote:</div><br class="m_-965336248231162288Apple-interchange-newline"><div><div dir="ltr"><div>Hi Justin,</div><div><br></div><div>It would be good to spell out a possible Eg range and our goals for summer of 2019. Then all depends. </div><div><br></div><div>I reported twice that if our range is limited by 4 - 6 GeV and our main goal is diff cross sections then </div><div>g12 from CLAS6 will work for us. There are no CLAS pol measurements in this case. So, we have </div><div>gp-->pi0p cross sections published several month ago and Volker's analyses for gp-->etap and </div><div>gp-->omegap are under the HW group review now.</div><div><br></div><div>If one can possible to go below 3 GeV then we will have more options including polarized <br>measurements. Additional benefit will come from the ability to use the PWA technology to evaluate</div><div>new data and possibility to provide "good" event generators for MC. See my slides at DB</div><div><br></div><div>Cheers, igor</div><div><br></div><div><br></div><br clear="all"><div><div dir="ltr" class="m_-965336248231162288gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div>-----</div><div>Igor Strakovsky, SAID INS The George Washington University</div><div>Tel: 571-553-8344(VC),202-994-4742(FB),Skype: igors1945_2, </div><div><span style="font-size:12.8px">Cell: 703-728-5627,</span><span style="font-size:12.8px">Emails: </span><a href="mailto:igor@gwu.edu" style="font-size:12.8px" target="_blank">igor@gwu.edu</a><span style="font-size:12.8px">, </span><a href="mailto:igor@jlab.org" style="font-size:12.8px" target="_blank">igor@jlab.org</a></div></div></div></div></div></div></div></div></div></div><br></div><br><div class="gmail_quote"><div dir="ltr">On Mon, Oct 15, 2018 at 12:50 PM Justin Stevens <<a href="mailto:jrsteven@jlab.org" target="_blank">jrsteven@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word;line-break:after-white-space">Hi All,<div><br></div><div>There’s been a proposal to have a short discussion about a potential low-energy run in Summer 2019 during tomorrow’s physics meeting. To frame the discussion: the accelerator plans to run at ~half energy during June/July 2018 and GlueX could potentially run parasitically during this period. </div><div><br></div><div>We had some discussion about the potential usefulness of low-energy running earlier this year (comparison to cross section measurements from CLAS, energy-dependence of polarization observables, etc.), but that was in a different context of using the full energy electron beam with lower coherent peak settings (see <a href="https://halldweb.jlab.org/wiki-private/index.php/Aug_7,_2018,_Physics_Working_Group" target="_blank">https://halldweb.jlab.org/wiki-private/index.php/Aug_7,_2018,_Physics_Working_Group</a>).</div><div><br></div><div>If you have something you would like to contribute to the discussion, please let me know.</div><div><br></div><div>-Justin<br><div><br><blockquote type="cite"><div>On Oct 14, 2018, at 1:46 PM, Justin Stevens <<a href="mailto:jrsteven@jlab.org" target="_blank">jrsteven@jlab.org</a>> wrote:</div><br class="m_-965336248231162288m_-160429451515303739Apple-interchange-newline"><div><div>Hi All,<br><br>Our next Physics WG meeting we be Tuesday, October 16 at 11:15 am, <a href="https://halldweb.jlab.org/wiki-private/index.php/Oct_16,_2018,_Physics_Working_Group" target="_blank">https://halldweb.jlab.org/wiki-private/index.php/Oct_16,_2018,_Physics_Working_Group</a>. Please let me know if you have something you would like to present.<br><br>-Justin<br>_______________________________________________<br>Halld-physics mailing list<br><a href="mailto:Halld-physics@jlab.org" target="_blank">Halld-physics@jlab.org</a><br><a href="https://mailman.jlab.org/mailman/listinfo/halld-physics" target="_blank">https://mailman.jlab.org/mailman/listinfo/halld-physics</a><br></div></div></blockquote></div><br></div></div>_______________________________________________<br>
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