Speaker
Description
The Time-Of-Flight TOF detectors of the muEDM experiment at PSI will be presented here.
The muEDM experiment aims at setting the ground for a new direct electric dipole moment (EDM)
search using muons. The experiment will perform this dedicated search using for the first time worldwide
the frozen-spin technique, aiming at improving the current sensitivity by more than three orders
of magnitude to better than 6×10−23 e cm, an astonishing jump. This search is a unique opportunity
to probe previously uncharted territory and to test theories Behind Standard Model physics.
One key point of the experiment is to store muons in the proper orbit and then to measure the
asymmetry of the positrons from the muon decays as a signature of a non-zero muon EDM.
Successful measurement of the muon EDM is crucially dependent on the control of systematic
effects. The dominant effect will be the alignment of the electric field required for the frozen-spin
technique, concerning the magnetic field defining the storage orbit.
To face with this challenge a clockwise (CW) and counter clockwise (CCW) muon injection is considered with a time-of-flight TOF detector.
The characteristics of the TOF detectors are high detection efficiency (above 95%) and high timing
resolution (below 1 ns), to measure impinging minimum ionizing particles. The main challenge is
addressing the above requests with very thin plastic scintillator foils, with a thickness of 100 μ m or
even below, to keep at the minimum the multiple scattering.
We will present the design, construction, and performances of the TOF detectors, where scintillating
foils are coupled to Silicon Photomultipliers (SiPMs). The obtained results, in conditions very similar
to the final one, showed very promising results: The expected detector performances are addressed
and satisfy the experiment requirements.
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