Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 26: Instrumentation V
HK 26.1: Talk
Wednesday, March 18, 2026, 13:45–14:00, PHIL A 301
Development of a Scintillating Fiber Hodoscope for the Proton Radius Measurement at AMBER — •Karl Eichhorn1, Jan Michael Friedrich1, Jarosław Grzyb2, Igor Konorov1, Martin J. Losekamm3, Tim Maehrholz1, Felix Mindl1, Stephan Paul1, Marcin Stolarski2, and Frowin Wild1 — 1TUM School of Natural Sciences - Technical University of Munich, 85748 Garching, Germany — 2National Centre for Nuclear Research, 02-093 Warsaw, Poland — 3European Space Agency, ESTEC, 2201 AZ Noordwijk, Netherlands
The AMBER experiment will measure the proton charge radius using elastic muon-proton scattering at the M2 beam line at CERN. Four Scintillating Fiber Hodoscopes (SFHs) will be used in combination with ALPIDE pixel sensors to reconstruct the incoming beam particles, as well as the muons that have been scattered off the active hydrogen target. Each SFH consists of four 9x9 cm2 large planes of square scintillating fibers, which are read out individually with SiPM arrays. Keeping the material budget to a minimum, they provide precise timing information using custom readout electronics based on the Citiroc 1A ASIC and the AMBER iFTDC. The first SFH detector was built and successfully tested with a high-energy muon beam in 2025. We will present the results of this beam test and provide an outlook on further developments.
We acknowledge funding from BMBF (grant number 05P24WO1) and MNiSW (grant number 2025/WK/03).
Keywords: proton radius; scintillating fibers; SiPM; particle detector