Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Instrumentation X

HK 44.2: Talk

Thursday, March 13, 2025, 14:15–14:30, SR Exp1B Chemie

Scintillating Fiber Hodoscopes for the Proton Radius Measurement at AMBER — •Karl Eichhorn, Jan Friedrich, Igor Konorov, Martin J. Losekamm, and Stephan Paul — School of Natural Sciences, Technical University of Munich, Garching, Germany

The AMBER collaboration aims to measure the proton-charge radius using elastic muon-proton scattering at the M2 beamline at CERN's Super Proton Synchrotron. The recoil of the proton will be measured in an active hydrogen target (TPC) while the scattering angle of the muon is reconstructed using novel Unified Tracking Stations (UTS). Each UTS contains ALPIDE pixel sensors and a Scintillating Fiber Hodoscope for timing. The SFH consists of four layers of scintillating fibers read out with silicon photomultipliers and provides precise timing information for reconstructing scattered muons. We present the detector design and results from a beam test with a detector prototype from 2024.

We acknowledge funding from BMBF, grant number 05P24WO1.

Keywords: Scintillating Fibers; SiPM; Proton Radius