A time resolved study of injection backgrounds during the first commissioning phase of SuperKEKB
| Autor: | Hiroyuki Nakayama, Frank Simon, I. Jaegle, Y. Funakoshi, Y. Ohnishi, Yusuke Suetsugu, H. Windel, C. Kiesling, S. Vahsen, Naomi van der Kolk, Marco Szalay, M. Gabriel, Michael Hedges, P. M. Lewis, Naoko Iida, Riccardo de Sangro |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Accelerator Physics (physics.acc-ph)
Physics - Instrumentation and Detectors Physics and Astronomy (miscellaneous) Physics::Instrumentation and Detectors Phase (waves) FOS: Physical sciences 02 engineering and technology QC770-798 Scintillator Astrophysics 01 natural sciences law.invention High Energy Physics - Experiment High Energy Physics - Experiment (hep-ex) Silicon photomultiplier Optics law Nuclear and particle physics. Atomic energy. Radioactivity 0103 physical sciences 010306 general physics Collider Engineering (miscellaneous) Physics business.industry Detector Instrumentation and Detectors (physics.ins-det) 021001 nanoscience & nanotechnology Betatron Synchrotron QB460-466 Physics::Accelerator Physics Physics - Accelerator Physics 0210 nano-technology business Beam (structure) |
| Zdroj: | European Physical Journal C: Particles and Fields, Vol 81, Iss 11, Pp 1-19 (2021) European Physical Journal |
| ISSN: | 1434-6052 1434-6044 |
| Popis: | 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. 19 pages, 12 figures, published in EPJ C |
| Databáze: | OpenAIRE |
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