A time resolved study of injection backgrounds during the first commissioning 
phase of SuperKEKB

Gabriel, Miroslav; Simon, Frank; Windel, Hendrik; Funakoshi, Yoshihiro; Hedges, Michael; Iida, Naoko; Jaegle, Igal; Kiesling, Christian; Kolk, Naomi van der; Lewis, Peter; Nakayama, Hiroyuki; Ohnishi, Yukiyoshi; Sangro, Riccardo de; Suetsugu, Yusuke; Szalay, Marco; Vahsen, Sven

doi:10.1140/epjc/s10052-021-09769-3

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A time resolved study of injection backgrounds during the first commissioning phase of SuperKEKB

MPS-Authors

Gabriel, Miroslav
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Simon, Frank
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Windel, Hendrik
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Funakoshi, Yoshihiro
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Hedges, Michael
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Iida, Naoko
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Jaegle, Igal
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kiesling, Christian
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Kolk, Naomi van der
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Lewis, Peter
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Nakayama, Hiroyuki
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Ohnishi, Yukiyoshi
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Sangro, Riccardo de
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Suetsugu, Yusuke
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Szalay, Marco
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

Vahsen, Sven
Max Planck Institute for Physics, Max Planck Society and Cooperation Partners;

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Citation

Gabriel, M., Simon, F., Windel, H., Funakoshi, Y., Hedges, M., Iida, N., et al. (2021). A time resolved study of injection backgrounds during the first commissioning phase of SuperKEKB. European Physical Journal C, 81, 972. doi:10.1140/epjc/s10052-021-09769-3.

Cite as: https://hdl.handle.net/21.11116/0000-000A-1B4C-4

Abstract

We report on measurements of beam backgrounds during the first commissioning phase of the SuperKEKB collider in 2016, performed with the plastic scintillator and silicon photomultiplier-based CLAWS detector system. The sub-nanosecond time resolution and single particle detection capability of the sensors allow bunch-by-bunch measurements, enable CLAWS to perform a novel time resolved analysis of beam backgrounds, and make the system uniquely suited for the study of injection backgrounds. We present measurements of various aspects of regular beam background and injection backgrounds which include time structure and decay behavior of injection backgrounds, hit-energy spectra and overall background rates. These measurements show that the elevated background rates following an injection generally last for several milliseconds, with the majority of the background particles typically observed within the first 500 us. The injection backgrounds exhibit pronounced patterns in time, connected to betatron and synchrotron oscillations in the accelerator rings. The frequencies of these patterns are determined from detector data.