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

[Jay Benesch]

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]