SiPM-based veto detector for the pion beam at FOPI

Abstract

Recently the FOPI collaboration carried out an experiment to study the in medium properties of the K + K − system by using the pion beam interactions at 1.7 GeV/c. The experiment with a pion beam poses specific requirements to the detectors and therefore the original FOPI setup needed modifications. The new hardware developments for this experiment include the replacement of the veto detector with another more compact design. Within this report we describe the design and results of a test measurement of the new FOPI veto detector system with the pion beam.