[PEPPo] Modeling of the positron sources: an experiment-based benchmarking

[Robert Rimmer]

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.
Bob.

________________________________
From: PEPPo <peppo-bounces at jlab.org> on behalf of Jay Benesch via PEPPo <peppo at jlab.org>
Sent: Wednesday, July 23, 2025 11:06 AM
To: peppo at jlab.org <peppo at jlab.org>
Subject: [PEPPo] Modeling of the positron sources: an experiment-based benchmarking

https://arxiv.org/abs/2507.16702

Modeling of the positron sources: an experiment-based benchmarking

Fahad Alharthi, Iryna Chaikovska, Robert Chehab, Viktor Mytrochenko
Fusashi Miyahara, Takuya Kamitani, Yoshinori Enomoto

High-intensity positron sources are critical for next-generation
electron-positron colliders, where positron beam quality and
characteristics directly impact the luminosity. Accurate modeling and
validated simulation tools for positron sources are essential to
optimize their performance. However, modeling a positron source tends to
be complex, as it involves multiple interdependent stages, from positron
production and capture dynamics to beam transport through the injector
linac to the collider ring. A reliable simulation framework should
integrate these processes to ensure efficient positron production and
transport. In this work, we present a start-to-end simulation tool
developed for positron sources modeling. The model was benchmarked
against existing simulation tools and validated through experimental
measurements conducted at the SuperKEKB positron source. Key operational
parameters were systematically scanned to evaluate the simulation model
performance, including the primary electron impact position on the
target, solenoid field strength around the capture linac, and RF phase
settings. The primary Figure-of-Merit for all validation tests was the
positron yield at the end of the SuperKEKB positron capture section. The
simulation results demonstrate a very good agreement with experimental
data and other simulation tools, confirming the model's reliability and
establishing a framework for future positron source studies.

Subjects:       Accelerator Physics (physics.acc-ph)
Cite as:        arXiv:2507.16702 [physics.acc-ph]
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