Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 9: Silicon Detectors I
T 9.5: Talk
Monday, March 16, 2026, 17:15–17:30, KH 01.012
The mechanical rotation system of the P2 tracking detector — •Dhanushka Bandara for the P2 collaboration — Institute of Nuclear Physics, Johannes Gutenberg University of Mainz, Johann-Joachim-Becher-Weg 45, 55128 Mainz, Germany.
The P2 experiment will measure the weak mixing angle at low-momentum with unprecedented precision, using the parity violating asymmetry in electron-proton scattering. The experiment will take place at the Mainz Energy-Recovering Superconducting Accelerator (MESA), currently in the advanced stage of construction at Johannes Gutenberg University of Mainz.
A key component in the P2 experiment is the tracking detector, which measures the momentum transfer Q2 of the scattered electrons. To allow for full azimuthal coverage with a limited size detector, a mechanical system is designed to rotate the tracker modules around the beam axis. The system should be operable in vacuum, withstand the intense radiation and provide precise movement. A scaled model is being built to study and understand the mechanics and the limitations of the rotational system.
This talk gives an overview of the P2 experiment and tracking detector, with the focus on the requirements and challenges of designing the tracker rotation system and how they are addressed.
Keywords: MESA; P2 experiment; Tracking detectors; Mechanical assembly; Integration