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Dear Colleagues,</div>
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Please find attached an IPAC'24 abstract describing the status of the Ce+BAF concept. I chose to focus on four updates, but we can adapt as we approach the conference. Please send me your comments by Monday 8am EDT. In particular, if an update to your
funding Acknowledgment please let me know.</div>
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cheers,</div>
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Joe</div>
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<p class="elementToProof" style="margin-top: 0px; margin-bottom: 0px;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>Title</b>: Status of positron beams at Jefferson Lab (Ce+BAF) </span></p>
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<p style="margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>Presenter</b>: Joe Grames (on behalf of the Ce+BAF working group) </span></p>
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<p style="margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>Abstract</b>: </span></p>
<p style="text-align: justify; margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: rgb(0, 0, 0);">The addition of positron beams to the 12 GeV Continuous Electron Beam Accelerator Facility (CEBAF) would provide a significant
capability to the experimental nuclear physics program at Jefferson Lab. A start-to-end concept for the generation of positron beams with required spin polarization, intensity and continuous-wave bunch train was presented at IPAC’23 [1]. In this contribution
updates to four areas are described: (1) polarized electron injector lattice parameters, (2) operating modes which provide primary and secondary-like electron beams, (3) radiation shielding in the positron target and collection region, and (4) properties of
the positron beams at the experimental target areas. </span></p>
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<p style="margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>Keywords: </b></span></p>
<p style="margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: rgb(0, 0, 0);">High duty-cycle positron beams, high positron beam polarization, PEPPo polarization transfer technique. </span></p>
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<p style="text-align: justify; margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>References: </b></span></p>
<p style="text-align: justify; margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: black;">[1] J. Grames et al., "Positron beams at Ce+BAF", in Proc. IPAC'23, Venice, Italy, May 2023, pp. 896-899. doi:10.18429/JACoW-IPAC2023-MOPL152 </span></p>
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<p style="text-align: justify; margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>Acknowledgments (JLab, ORNL, IJCLab, Univ Sinaloa) </b></span></p>
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<p style="margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: black;">This project is supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics </span></p>
<p style="margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: black;">under contract DE-AC05-06OR23177</span><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: rgb(32, 31, 30);">; UT-Battelle, LLC,
under contract DE-AC05-00OR22725 with the </span></p>
<p style="margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: rgb(32, 31, 30);">US Department of Energy (DOE);
</span><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: black;">the European Union's Horizon 2020 research and innovation program </span></p>
<p style="margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: black;">under agreement STRONG - 2020 – No. 824093; the Programa de Fomento y Apoyo a Proyectos de </span></p>
<p style="text-align: justify; margin: 0in;"><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: black;">Investigación code A1-022, from the Universidad Autónoma de Sinaloa.</span><span style="font-family: "Times New Roman", serif; font-size: 11pt; color: rgb(0, 0, 0);"> </span></p>
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