Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 40: Detektorsysteme I
T 40.8: Vortrag
Dienstag, 20. März 2018, 18:15–18:30, Z6 - SR 2.007
Building a Tracking Detector for the P2 Experiment — •Marco Zimmermann for the P2 collaboration — Institute for 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 asymmetry 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 145 MeV electrons.
While the main asymmetry measurement is performed with integrating Cherenkov detectors, the tracking system is developed in order to determine the momentum transfer in the target and for systematic studies. The high signal and background particle rates are the main challenge, in particular because of bremsstrahlung photons produced in the liquid hydrogen target. The particle rates are analysed in a Geant4-based Monte Carlo simulation. Measurements of the sensor response to photons were performed and compared to the simulation.
The detector will be built using High Voltage Monolithic Active Pixel Sensors (HV-MAPS) made of silicon thinned to 50 µm. Four tracking planes will be arranged as two double layers. For each double layer, four modules are built to cover together about one sixth of azimuthal space. Every module consists of about 600 sensors, of which each has 2x2cm2 area and an expected power consumption of about 1W. The main mechanical setup of one module will be shown together with simulations of the gaseous helium cooling system.