<div dir="ltr">Hello all,<div><br></div><div>After a closer look at the numbers, we will not be able to run with the coherent edge at 8.8GeV during the coming run. At an endpoint energy of 11.41 GeV, the range covered by the tagger microscope at its current position on the focal plane is:</div><div><br></div><div>7.730 - 8.730 GeV</div><div><br></div><div>I would recommend at least a gap of 100 MeV between the coherent edge and the edge of the microscope so that we can still see the full coherent edge, even as the diamond degrades. I think a safe place to put it would be 8.600 GeV.</div><div><br></div><div>-Richard Jones</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Nov 27, 2019 at 11:37 AM Alexandre Deur <<a href="mailto:deurpam@jlab.org">deurpam@jlab.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<span style="margin:0px;font-family:Calibri,Helvetica,sans-serif;background-color:rgb(255,255,255);display:inline">Dear Collaborators,</span><br>
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The plan, as shown at the weekly MCC meeting today, is to start physics beam delivery to Hall D at <span style="margin:0px;background-color:rgb(255,255,255);display:inline">8am </span>on Tuesday Dec. 3rd. Consequently, shifts are now on<span> </span><span style="margin:0px">standby </span>up
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This 24h delay is only due to the usual difficulties of establishing the beam. Otherwise, most of the accelerator work is going well and is more or less on track.</div>
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The nominal beam energy for Hall D is now decided and is 11.41 GeV. We will run at this energy providing that it is sustainable. The previous runs were at 11.6 GeV. </div>
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The Hall is ready for beam. It is going now to Control Access and will remain so until we need to close it (presumably Monday evening) for beam delivery. </div>
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Please let me know if you have any question.</div>
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Thank you,</div>
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Alexandre Deur, </div>
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Hall D run coordinator (757) 383 5542</div>
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