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thanks Jay. Also to point out again that FRIB has developed, with an SBIR company, a rad-hard polymer seal for their rotating target. I remember hearing about it at one of Michelle's exchange meetings.</div>
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Bob.</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> PEPPo <peppo-bounces@jlab.org> on behalf of Jay Benesch via PEPPo <peppo@jlab.org><br>
<b>Sent:</b> Wednesday, July 23, 2025 11:06 AM<br>
<b>To:</b> peppo@jlab.org <peppo@jlab.org><br>
<b>Subject:</b> [PEPPo] Modeling of the positron sources: an experiment-based benchmarking</font>
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<div class="PlainText"><a href="https://arxiv.org/abs/2507.16702">https://arxiv.org/abs/2507.16702</a><br>
<br>
Modeling of the positron sources: an experiment-based benchmarking<br>
<br>
Fahad Alharthi, Iryna Chaikovska, Robert Chehab, Viktor Mytrochenko <br>
Fusashi Miyahara, Takuya Kamitani, Yoshinori Enomoto<br>
<br>
High-intensity positron sources are critical for next-generation <br>
electron-positron colliders, where positron beam quality and <br>
characteristics directly impact the luminosity. Accurate modeling and <br>
validated simulation tools for positron sources are essential to <br>
optimize their performance. However, modeling a positron source tends to <br>
be complex, as it involves multiple interdependent stages, from positron <br>
production and capture dynamics to beam transport through the injector <br>
linac to the collider ring. A reliable simulation framework should <br>
integrate these processes to ensure efficient positron production and <br>
transport. In this work, we present a start-to-end simulation tool <br>
developed for positron sources modeling. The model was benchmarked <br>
against existing simulation tools and validated through experimental <br>
measurements conducted at the SuperKEKB positron source. Key operational <br>
parameters were systematically scanned to evaluate the simulation model <br>
performance, including the primary electron impact position on the <br>
target, solenoid field strength around the capture linac, and RF phase <br>
settings. The primary Figure-of-Merit for all validation tests was the <br>
positron yield at the end of the SuperKEKB positron capture section. The <br>
simulation results demonstrate a very good agreement with experimental <br>
data and other simulation tools, confirming the model's reliability and <br>
establishing a framework for future positron source studies.<br>
<br>
Subjects: Accelerator Physics (physics.acc-ph)<br>
Cite as: arXiv:2507.16702 [physics.acc-ph]<br>
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