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<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif">The energy increase is not coming for free. It is accompanied by lower availability. You have to put this into the equation when you try to estimate a figure of merit. It is exactly why we
were asked this question<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black;mso-ligatures:standardcontextual">-Eugene<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Rgc <rgc-bounces@jlab.org>
<b>On Behalf Of </b>Sebastian Kuhn via Rgc<br>
<b>Sent:</b> Wednesday, August 07, 2024 09:21<br>
<b>To:</b> Kuhn, Sebastian E. via Rgc <rgc@jlab.org><br>
<b>Subject:</b> [Rgc] Fwd: [Rgc_analysis] [EXTERNAL] Fwd: Beam Energy Requirements in Hall B<o:p></o:p></span></p>
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<p class="MsoNormal">In case you haven’t gotten my previous request… =><o:p></o:p></p>
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<p class="MsoNormal">Begin forwarded message:<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Helvetica Neue"">From: </span></b><span style="font-family:"Helvetica Neue"">"Kuhn, Sebastian E. via Rgc_analysis" <<a href="mailto:rgc_analysis@jlab.org">rgc_analysis@jlab.org</a>></span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Helvetica Neue"">Subject: [Rgc_analysis] [EXTERNAL] Fwd: Beam Energy Requirements in Hall B</span></b><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Helvetica Neue"">Date: </span></b><span style="font-family:"Helvetica Neue"">August 5, 2024 at 11:25:37</span><span style="font-family:"Arial",sans-serif"> </span><span style="font-family:"Helvetica Neue"">AM
EDT</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Helvetica Neue"">To: </span></b><span style="font-family:"Helvetica Neue"">Silvia Niccolai via Rgc_analysis <<a href="mailto:Rgc_analysis@jlab.org">Rgc_analysis@jlab.org</a>></span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Helvetica Neue"">Reply-To: </span>
</b><span style="font-family:"Helvetica Neue"">"Kuhn, Sebastian E." <<a href="mailto:skuhn@odu.edu">skuhn@odu.edu</a>></span><o:p></o:p></p>
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<p class="MsoNormal">Dear all, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I would like to respond to this request by Patrick with a joint statement from RG-C. As you know, we just passed our jeopardy review, and RG-C may be back on the schedule for the remaining 40 PAC days in 2026-27. I personally would very
much like to see more than 10.7 GeV for that run - during the jeopardy review, I showed that at least for DIS this would recover the highest x-bin we originally proposed that presently has huge error bars because nearly no events fall inside that bin with
the the usual cuts. If we can go to 11 GeV, we would gain a factor 4-5 (2 times smaller error bar) in statistics; with 10.7 GeV, less than a factor of 2 in counts. If you have any similar conclusions for your favorite Physics channel, please try to send an
argument my way; alternatively, if you don’t care, please let me know also.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">- Sebastian<o:p></o:p></p>
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<p class="MsoNormal">Begin forwarded message:<o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Helvetica Neue"">From: </span></b><span style="font-family:"Helvetica Neue"">Patrick Achenbach <<a href="mailto:patricka@jlab.org">patricka@jlab.org</a>></span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Helvetica Neue"">Subject: Beam Energy Requirements in Hall B</span></b><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Helvetica Neue"">Date: </span></b><span style="font-family:"Helvetica Neue"">July 23, 2024 at 5:47:27</span><span style="font-family:"Arial",sans-serif"> </span><span style="font-family:"Helvetica Neue"">PM
EDT</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Helvetica Neue"">To: </span></b><span style="font-family:"Helvetica Neue"">Latifa Elouadrhiri <<a href="mailto:latifa@jlab.org">latifa@jlab.org</a>>, Silvia Niccolai <<a href="mailto:silvia.niccolai@ijclab.in2p3.fr">silvia.niccolai@ijclab.in2p3.fr</a>>,
"Sebastian E. Kuhn" <<a href="mailto:skuhn@odu.edu">skuhn@odu.edu</a>>, Raphael Dupre <<a href="mailto:raphael.dupre@ijclab.in2p3.fr">raphael.dupre@ijclab.in2p3.fr</a>>, Hayk Hakobyan <<a href="mailto:hayk.hakobyan@usm.cl">hayk.hakobyan@usm.cl</a>>, Ilya Larin
<<a href="mailto:ilarin@jlab.org">ilarin@jlab.org</a>>, "<a href="mailto:mcontalb@fe.infn.it">mcontalb@fe.infn.it</a>" <<a href="mailto:mcontalb@fe.infn.it">mcontalb@fe.infn.it</a>>, William Brooks <<a href="mailto:william.brooks@usm.cl">william.brooks@usm.cl</a>>,
Richard G Milner <<a href="mailto:milner@mit.edu">milner@mit.edu</a>></span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Helvetica Neue"">Cc: </span></b><span style="font-family:"Helvetica Neue"">Stepan Stepanyan <<a href="mailto:stepanya@jlab.org">stepanya@jlab.org</a>></span><o:p></o:p></p>
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<b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">EXTERNAL to ODU:</span></b><span class="apple-converted-space"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black"> </span></span><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:black">This
email is not from an ODU account. Do not click links or open attachments unless you recognize the sender and know the content is safe.</span><span style="font-family:"Helvetica",sans-serif"><o:p></o:p></span></p>
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<p class="MsoNormal">Dear contact persons of '11-GeV runs' in Hall-B,<o:p></o:p></p>
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<p class="MsoNormal">Earlier this year, DOE has performed an Operations Review which was concluded with a list of comments and recommendations. One particular recommendation is to... "Develop a<span class="apple-converted-space"> </span><b>beam energy requirement</b> document
for the approved experiments in the experimental halls, complete with physics justifications. This document must be distinctly separate from issues pertaining to reliability." <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Physics division will compile, for each experiment still to run,<span class="apple-converted-space"> </span><b>(a) Proposed Energies, (b) Minimum Acceptable Maximum Energy if 12 GeV was proposed, (c) Science Impact of difference from 12
GeV, and (d) any potential mitigation such as run longer.</b><o:p></o:p></p>
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<p class="MsoNormal">The focus of this recommendation is a review/justification for a 12-GeV CEBAF beam (equiv. to 11 GeV delivered to Hall B) as compared to a beam with some 100s MeV less energy. <o:p></o:p></p>
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<p class="MsoNormal">Can you please give me input to the requested table entries (a) to (d)? Feel free to justify running at 11 GeV for Hall B with some extra narrative if the table is not sufficient. I believe, we can give common numbers for experiments in
run groups for which the science impact and the potential mitigation is similar. However, I don't think that we can combine all experiments from a run group.<o:p></o:p></p>
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<p class="MsoNormal">Let me remind you, the scheduled beam energy for the next run is 1060 MeV per linac, equiv. to 10.70 GeV in Hall B. Plans are in place to increase this to 1090 MeV, equiv. to 11 GeV in Hall B for the FY26, but not at all cost. <o:p></o:p></p>
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<p class="MsoNormal">Physics division is not moving quickly on this, so a reasonable target to have all information compiled is<span class="apple-converted-space"> </span><b>August 20, 2024</b>.<o:p></o:p></p>
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<p class="MsoNormal">Best regards, <o:p></o:p></p>
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<p class="MsoNormal">Patrick<o:p></o:p></p>
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<p class="MsoNormal">_______________________________________________<br>
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