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Dear Ce<sup>+</sup>BAF colleagues,</div>
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The abstract to SPIN2023 is copied below; it's fairly straight-forward so please send me comments by end of today, thanks. -Joe</div>
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<span style="font-family:"Times New Roman", serif">Positron beams are considered as a new capability for the CEBAF 12 GeV accelerator at Jefferson Lab.<span> <span class="Apple-converted-space"> </span></span>This capability would provide users with a unique
facility for hadronic physics experiments and tests of the Standard Model.<span class="Apple-converted-space"> </span><span> </span>Secondary e<sup>+</sup>/e<sup>-</sup><span class="Apple-converted-space"> </span>particle beams are created using the polarized
bremsstrahlung of an intense continuous-wave (CW) spin polarized primary electron beam. To do this, the existing Low Energy Research Facility is re-imagined with a new 300 kV dc HV GaAs photogun which provides an intense ~1 mA and highly polarized ~90% electron
beam. This beam is accelerated to ~100 kW and directed to a rotating W-target, where secondary e<sup>+</sup><span class="Apple-converted-space"> </span>(or e<sup>-</sup>) are collected to a CW beam, accelerated to 123 MeV and injected to CEBAF for energies
up to 12 GeV.<span> <span class="Apple-converted-space"> </span></span>This new Ce<sup>+</sup>BAF configuration is optimized to provide experiments with positron spin polarization >60% and intensity greater than >100 nA, and greater intensities when high spin
polarization is not required.<o:p> </o:p></span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Patrizia Rossi <rossi@jlab.org><br>
<b>Sent:</b> Tuesday, April 25, 2023 10:10 AM<br>
<b>To:</b> Joe Grames <grames@jlab.org><br>
<b>Cc:</b> Patrizia Rossi <rossi@jlab.org>; Ernst Sichtermann <epsichtermann@lbl.gov>; Anselm Vossen, Ph.D. <anselm.vossen@duke.edu>; Matthew Poelker <poelker@jlab.org><br>
<b>Subject:</b> Invitation for a talk at SPIN2023</font>
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<p class="x_MsoNormal"><span class="x_elementtoproof"><span style="font-size:12.0pt; color:black; background:white">Dear Joe,</span></span></p>
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<p class="x_MsoNormal" style="background:white"><span class="x_contentpasted0"><span style="color:black">On behalf of the organizing committee of the SPIN 2023 conference, we invite you to give a talk on 'A positron beam at CEBAF” in the session "Future Facilities
and Experiments" .</span></span><span style="color:black"></span></p>
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<p class="x_MsoNormal" style="background:white"><span class="x_contentpasted0"><span style="color:black">Please submit a short abstract by May 31, 2023. Conference details including the link for abstract submission can be found at:</span></span><span class="x_apple-converted-space"><span style="font-size:12.0pt; color:black"> </span></span><span class="x_contentpasted0"><span style="color:black"><a href="https://indico.jlab.org/event/663/"><span style="font-size:12.0pt">https://indico.jlab.org/event/663/</span></a></span></span><span class="x_apple-converted-space"><span style="font-size:12.0pt; color:black"> </span></span><span class="x_contentpasted0"><span style="color:black"> </span></span><span style="color:black"></span></p>
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<p class="x_MsoNormal" style="background:white"><span class="x_contentpasted0"><span style="color:black">A hardcopy invitation on SPIN 2023 letterhead can be obtained by contacting co-chairs Thomas Mehen and Anselm Vossen at:</span></span><span class="x_apple-converted-space"><span style="font-size:12.0pt; color:black"> </span></span><span class="x_contentpasted0"><span style="color:black"><a href="mailto:spin2023_contact@duke.edu">spin2023_contact@duke.edu</a>. </span></span><span style="color:black"></span></p>
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<p class="x_MsoNormal" style="background:white"><span class="x_contentpasted0"><span style="color:black">We hope very much that you can accept our invitation and we look forward to seeing you at the conference, </span></span><span style="color:black"></span></p>
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<p class="x_MsoNormal" style="background:white"><span class="x_contentpasted0"><span style="color:black">Sincerely,</span></span><span style="font-size:12.0pt; color:black"></span></p>
<p class="x_MsoNormal" style="background:white"><span class="x_contentpasted0"><span style="color:black">Patrizia</span></span><span style="font-size:12.0pt; color:black"></span></p>
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<p class="x_MsoNormal"><span style="color:black">-------------------------------------------</span></p>
<p class="x_MsoNormal"><span style="color:black"># Patrizia Rossi<br>
# Jefferson Lab <br>
# 12000 Jefferson Avenue<br>
# Suite 5<br>
# Newport News VA 23606 (USA)<br>
# e-mail: </span><a href="mailto:rossi@jlab.org">rossi@jlab.org</a><span style="color:black"><br>
# phone: +1 (757) 269 7740<br>
# fax: + 1 (757) 269 5800</span></p>
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