Speaker
Description
The muEDM experiment at Paul Scherrer Institute is designed to reach an unprecedented sensitivity on the electric-dipole moment of the muon (muEDM): $d_{\mu}$ < 6x10$^{-23}$ e$\cdot$cm. A precursor of the experiment is being built to demonstrate the potentials of the newly proposed "frozen-spin technique" to measure the muEDM and will be operational in 2026.
For measuring the up-down asymmetry of decay positrons, we propose a positron tracker built from scintillating ($\phi$ = 250-500 µm) fibers coupled to SiPMs (Hamamatsu S13360-50PE). This detector concept meets many prerequisites: fast signal, small material budget, can be operated inside a magnetic field. The detector modules are organized in two super-modules: a set of planes with 4x4 cm$^2$ active area made of two layers of orthogonal fibers will be arranged in a clock-like configuration to optimize the measurement of $(g-2)_µ$; four cylinders (each formed by two layers of fibers arranged in a stereo configuration, with axes // z-axis and r = {2.0, 2.3, 3.6, 4.5} cm, 3.0 cm being the muon orbit radius) compose a module optimized to measure the muEDM. The stereo configuration will allow 1 mm 3D resolution of the hit coordinate. The ~2000 SiPMs which compose this detector are read-out by the CAEN FERS system.
We will present the R&D behind the concept of this new detector as well as simulated performances and the ongoing work towards the construction of the final tracker, which will be commissioned at the end of 2025.
| Primary experiment | muEDM Experiment |
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