Improved simulation of beam backgrounds and collimation at SuperKEKB
Abstract
Mitigation of beam backgrounds via collimators is critical for the success of the Belle~II experiment at the SuperKEKB electron-positron collider. We report on an improved simulation methodology, which includes a refined physical description of the collimators and beam pipe, our first implementation of collimator tip scattering, and in which the existing beam particle tracking software has been embedded into a new sequential tracking framework. These improvements resolve longstanding discrepancies between measured and predicted Belle~II background levels, and significantly reduce the computing time required to optimize the collimation system in simulation. Finally, we report on collimator aperture scans, which confirm the accuracy of the simulation and suggest a new method for aligning the collimators.
Keywords
Cite
@article{arxiv.2104.02645,
title = {Improved simulation of beam backgrounds and collimation at SuperKEKB},
author = {A. Natochii and S. E. Vahsen and H. Nakayama and T. Ishibashi and S. Terui},
journal= {arXiv preprint arXiv:2104.02645},
year = {2021}
}
Comments
18 pages, 30 figures (including subfigures), 5 tables, to be submitted to PRAB