Bonn 2020 – scientific programme

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T: Fachverband Teilchenphysik

T 12: Detector systems I

T 12.3: Talk

Monday, March 30, 2020, 17:05–17:20, H-HS XIII

CLAWS: Monitoring Injection Backgrounds at SuperKEKB — •Hendrik Windel for the Belle II collaboration — Max-Planck-Insitut für Physik, München

The electron-positron collider SuperKEKB uses continuous injections at a rate of 50 Hz to achieve the highest possible luminosities. These injections result in periods of higher beam backgrounds which may impose constraints on the operation of the Belle II detector. To monitor the level and time structure of the injection backgrounds, CLAWS, a system based on plastic scintillator tiles read out with silicon photomultipliers connected to a readout system providing continuous readout over several thousand revolutions of the accelerator with sub-nanosecond time resolution, was installed as part of the inner commissioning detector of Belle II for the second phase of commissioning from February to July 2018. A modified version of the CLAWS detector system is now a permanent part of the beam background monitoring for the Belle II experiment and began regular physics operation in March 2019. This contribution will discuss the hardware installations of the second phase of commissioning and show results from background measurements during the second comissioning phase and physics phase of SuperKEKB.