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T: Fachverband Teilchenphysik

T 20: Detektorsysteme I

T 20.2: Vortrag

Montag, 25. März 2019, 16:15–16:30, ST 4

CLAWS: Monitoring Injection Backgrounds at SuperKEKB — •Hendrik Windel for the Belle 2 collaboration — Max-Planck-Institut 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, an array of 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 becoming a permanent part of the beam background monitoring for the Belle II experiment, scheduled to begin regular physics operation in March 2019. This contribution will discuss results from background measurements during the second phase of commissioning, and present the technological evolution of the CLAWS system towards a permanent background monitoring detector.