Speaker
Description
The AMBER experiment at CERN will measure the proton's charge radius via muon-proton elastic scattering at high projectile energies and small momentum transfers to help to resolve the so-called ‘proton radius puzzle’, i.e., the discrepancy between charge radii measured with different experimental techniques. The core setup at AMBER consists of a hydrogen-filled time projection chamber (TPC). Tracking detectors upstream and downstream of the TPC measure the trajectories of the incoming and outgoing muons to determine their scattering angles. To resolve pile-up hits in the tracking detectors, we are constructing four high-granularity hodoscopes from 500-$\mu$m scintillating-plastic fibers and arrays of silicon photomultipliers. In this contribution, we present the design of the scintillating-fiber hodoscopes, first results of test-beam measurements with scaled-down prototypes, and the projected capabilities of the final detectors. We will particularly emphasize how we managed to design detectors with a low material budget that nonetheless generate signals that are large enough for achieving high detection efficiencies.
| Primary experiment | AMBER |
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