The scintillating fiber tracker of the Ziré detector on the NUSES space mission

Abstract NUSES is a pathfinder satellite to be deployed in low Earth orbit, equipped with new technologies for space-based detectors. It will carry two payloads: Terzina , for detecting ultra-high-energy cosmic-ray and neutrino air showers, and Ziré , for measuring low energy cosmic rays and gamma rays. Zirè includes several subdetectors: a Fiber TracKer (FTK), a Plastic Scintillator Tower (PST), a calorimeter (CALOg), an AntiCoincidence System (ACS), and a Low Energy Module (LEM). The majority of Ziré will be based on scintillators with Silicon Photomultiplier (SiPM) readout. The FTK is based on thin scintillating fibers readout by SiPM arrays. We assembled several fiber tracker prototypes and tested them with custom developed Front-End Boards (FEBs) based on PETIROC2A and CITIROC. A full, reduced scale protptype of Ziré , Zirettino was designed and assembled. The FTK prototypes and Zirettino were tested in the laboratory and at the CERN PS and SPS facilities.