Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 31: Flavourphysik 1

T 31.6: Talk

Tuesday, March 28, 2017, 12:15–12:30, JUR 490

CLAWS: Beam background monitoring in the commissioning of SuperKEKB — •Miroslav Gabriel, Frank Simon, Hendrik Windel, and Naomi von der Kolk — Max Planck Insitute for Physics

The SuperKEKB collider, is designed to achieve unprecedented luminosities, 40 times higher than the record-breaking luminosity of the former KEKB machine. With the first beams being circulated between February and July 2016, the machine successfully conducted its first commissioning phase. A precise understanding of the backgrounds at the interaction point of the accelerator are crucial for the operation of the Belle II detector and, in particular, its pixel vertex detector. To study these conditions prior to the final installation of the Belle II experiment, a dedicated detector setup called Beam Exorcism forA Stable ExperimenT II (BEAST II) was installed during the first commissioning phase. BEAST II consists of several subsystems each for a different type of measurements. Among those systems is sCintillation Light And Waveform Sensors (CLAWS), consisting of eight plastic scintillator tiles with directly coupled silicon photomultipliers (SiPMs), specifically used for determining the time dependence of backgrounds from injection bunches over millisecond time frames. This contribution will discuss results from the BEAST experiment and their implications on the operation of Belle II, with particular emphasis on measurements of the time evolution of injection backgrounds with CLAWS.