Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 92: Detectors 8 (semiconductors)

T 92.1: Talk

Thursday, March 7, 2024, 16:00–16:15, Geb. 30.23: 2/1

A double arm spectrometer for the measurement of energy loss in silicon sensors — •Laura Bees, Tamasi Kar, and André Schöning — Physikalisches Institut, Ruprecht Karl University, Heidelberg

The aim of the double arm spectrometer is to precisely measure the energy loss of low energy electrons < 50 MeV in silicon sensors with a resolution of ≪ 1%. It is designed such that a charged particle is deflected in two 180^∘ turns in strong magnetic fields with opposite polarity. The detector arms, which each comprise two thin (monolithic) pixel layers, detect the particle’s position and direction before entering and after leaving the magnetic field. Located between the two spectrometer arms is the position sensitive device under test (DUT). The energy loss in the DUT can be deduced from the particle’s momentum difference measured between the first and second arm. In the talk, results obtained from a Geant4 simulation are presented. Of particular interest is the maximum achievable energy loss resolution and the study of systematic uncertainties from magnetic stray fields and misalignment.

The double arm spectrometer will serve as a high precision instrument to calibrate the energy loss in tracking detectors and for measuring the energy resolution in dE/dx measurements. It can also be used for studying the energy resolution of converted photons in the Mu3e-Gamma experiment, which has been proposed to search for the lepton flavor violating decay µ⁺→ e⁺ + γ (e⁺e⁻) and employs an active silicon converter.

Keywords: MAPs; spectrometer; low energy; energy loss