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T: Fachverband Teilchenphysik

T 12: Detector systems I

T 12.4: Vortrag

Montag, 30. März 2020, 17:20–17:35, H-HS XIII

A Scintillator Based Background and Beam Abort System for SuperKEKB — •Ivan Popov for the Belle II collaboration — Max Planck Institut für Physik, München, Deutschland

The asymmetric-energy collider SuperKEKB started its physics operation in March 2019. The usage of a nano-beam scheme will enable collisions of electrons and positrons at record-breaking luminosities, but requires continuous particle injections at a rate of 50 Hz. These injections result in periods of high backgrounds, which can negatively affect the operation of Belle II subdetectors. In order to monitor and mitigate such backgrounds, the CLAWS detector system, consisting of scintillator tiles read out by silicon photomultipliers, is in operation in various forms since 2016. Beginning with the first physics run in 2019, 32 sensor modules have been distributed along the final focusing magnets. The advantageous locations of these sensors make the CLAWS system ideal for rapid detection of disturbances in the particle beam. The joint usage of fast read out electronics and a smart trigger logic enables the generation of a beam abort trigger within a few 100 ns after the occurrence of excessive background, thus ensuring the safe operation of the experiment. In this report, the development of CLAWS system for its secondary use as a beam abort system is discussed.