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

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 se...

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Bibliographic Details
Published in:The European physical journal. C, Particles and fields Particles and fields, 2021-11, Vol.81 (11), p.1-19, Article 972
Main Authors: Gabriel, Miroslav, Simon, Frank, Windel, Hendrik, Funakoshi, Yoshihiro, Hedges, Michael, Iida, Naoko, Jaegle, Igal, Kiesling, Christian, van der Kolk, Naomi, Lewis, Peter, Nakayama, Hiroyuki, Ohnishi, Yukiyoshi, de Sangro, Riccardo, Suetsugu, Yusuke, Szalay, Marco, Vahsen, Sven
Format: Article
Language:English
Subjects:
Analysis
Astronomy
Astrophysics and Cosmology
Atoms & subatomic particles
Commissioning
Detectors
Elementary Particles
Energy
Energy spectra
Hadrons
Heavy Ions
Measurement Science and Instrumentation
Nuclear Energy
Nuclear Physics
Photomultiplier tubes
Physics
Physics and Astronomy
Quantum Field Theories
Quantum Field Theory
Scintillation counters
Sensors
Special Article - Tools for Experiment and Theory
String Theory
Synchrotrons
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Summary: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 μ s . 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.
ISSN:1434-6044
1434-6052
DOI:10.1140/epjc/s10052-021-09769-3