Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 99: Detektorsysteme IV
T 99.1: Vortrag
Donnerstag, 3. März 2016, 16:45–17:00, VMP8 SR 205
Building a Tracking Detector for the P2 Experiment — •Marco Zimmermann for the P2 collaboration — Institute of Nuclear Physics, Johannes Gutenberg University, Mainz — PRISMA Cluster of Excellence
The P2 Experiment aims to measure the weak mixing angle at low Q2 via the parity violating assymetry in elastic electron-proton scattering. It will be located at the new Mainz Energy Recovery Superconducting Accelerator (MESA), which will provide a 150 µA beam of alternatingly polarized 150 MeV electrons.
While the main asymmetry measurement is performed with integrating Cherenkov detectors, the tracking system is developed in order to determine the average momentum transfer of the electron and to reconstruct individual electron tracks for systematic studies. It will be built using the new technology of High Voltage Monolithic Active Pixel Sensors (HV-MAPS) made of silicon thinned to 50 µm.
The main challenge for the tracking system are very high expected particle rates. The expected rate of electrons that are scattered in the liquid hydrogen target and hit the tracking system is of the order 105mm−2s−1 and is overwhelmed by more than 107 mm−2s−1 bremsstrahlung photons.
Each of the tracking layers is envisaged to have a disc-like geometry. They are arranged as two double layers. Since only limited sensor area is affordable, each layer is divided into four segments with about 15 degree azimutal coverage. This layout is presented and motivated by investigations on the expected hit rates and the sensor response.