Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 88: Detector Systems III

T 88.1: Talk

Thursday, March 18, 2021, 16:00–16:15, Tm

A Scintillator Based Background and Beam Abort System for SuperKEKB — •Ivan Popov, Hendrik Windel, Thomas Kraetzschmar, and Frank Simon — Max Planck Institute for Physics

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. Over the course of SuperKEKB's run time in 2020 the sensors have been proven to reliably and consistently observe disturbances in the particle beam which can result in catastrophically high backgrounds and quenches of the final focusing magnets. An upgrade of the electronics and the DAQ together with the implementation of a smart trigger logic enables the generation of a beam abort trigger within 400 ns after the occurrence of excessive background, thus ensuring the safe operation of the experiment. The CLAWS system is currently undergoing the necessary upgrades, which will enable its use as a beam abort system and will be operational in time for SuperKEKB's 2021 run time. In this report, the development and early results of the CLAWS system upgrade are discussed.