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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Based on the optics runs we need, this beam pipe limit is not a problem (for the delta scan/H(e,e’p) and optics/gem positioning). The only requirement for 13.5 deg is the physics setting. We should discuss this at our next meeting to get
back to Mark. <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">-Holly<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></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">Mark Kevin Jones <jones@jlab.org><br>
<b>Date: </b>Thursday, July 11, 2024 at 7:00 AM<br>
<b>To: </b>Axel Schmidt <schmidta@jlab.org>, Edward R Kinney <edward.kinney@colorado.edu>, Florian Hauenstein <hauenst@jlab.org>, "hamlet@jlab.org" <hamlet@jlab.org>, Holly Szumila-Vance <hszumila@jlab.org>, Larry Weinstein <weinstei@jlab.org>, Or Hen <hen@mit.edu>,
Peter Bosted <bosted@jlab.org>, William Henry <wmhenry@jlab.org>, Douglas Higinbotham <doug@jlab.org><br>
<b>Subject: </b>Exit beam pipe during LAD/RSIDIS<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;font-family:Aptos;color:black">Hi,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black"> To reduce the radiation budget and background in the SHMS during RSIDIS, the RSIDIS<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black">experiment is looking into eliminating some kinematics with the HMS at 11 degrees. This way we could<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black">use the medium size beam pipe. The medium size beam pipe limits HMS to 13.5 deg. From my knowledge<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black">of the LAD kinematics this is the smallest HMS angle. But I wanted to check. Let me know if RSIDIS<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black">decides that minimum of 13.5 is ok for them, that it is ok for LAD experiment.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black">For general info this are the specs for the three exit beam lines.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black">small line SHMS min @5.5 and HMS min @11.01 , min HMS/SHMS separation angle = 18.50<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black"> medium line SHMS min@ 7.5 plus HMS min @13.5 , min HMS/SHMS separation angle=21.0 deg<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black"> large beam line SHMS min @10.0 and HMS min @14.5, min HMS/SHMS separation angle = 24.5 deg<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black">Cheers,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Aptos;color:black"> Mark<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:12.0pt;font-family:Aptos;color:black"><o:p> </o:p></span></p>
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