Dortmund 2021 – scientific programme
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T: Fachverband Teilchenphysik
T 39: Pixel Detectors II
T 39.6: Talk
Tuesday, March 16, 2021, 17:20–17:35, Tn
Design and cooling of the tracking detector for the P2 experiment — •Michail Kravchenko for the P2 collaboration — PRISMA+ Cluster of Excellence and Institute of Nuclear Physics, Johannes Gutenberg University Mainz
The P2 Experiment aims to measure the weak mixing angle sin2 θw at low momentum transfer Q2 by measuring the parity violating asymmetry in elastic electron-proton scattering. It will be carried out at the Mainz Energy-recovering Superconducting Accelerator (MESA), which will provide a 150 µA beam of alternatingly polarized 150 MeV electrons with excellent beam stability. 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 High Voltage Monolithic Active Pixel Sensors (HV-MAPS) made of silicon thinned to 50 µm. HV-MAPS allow reducing the material budget to a minimum by integrating the readout on the sensor substrate. The tracking detector modules will be cooled by the gas flow, and helium is selected as a coolant. The current state of the P2 tracking detector design development and of the results of the computational fluid dynamics (CFD) simulation for evaluating the cooling efficiency are presented.