Wuppertal 2015 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 34: Halbleiter: Test und Auslese 1
T 34.9: Vortrag
Montag, 9. März 2015, 18:45–19:00, K.12.18 (K3)
Gaseous Helium Cooling of the Mu3e Silicon Pixel Detector — Philipp Austermühl, •Adrian Herkert, Lukas Huxold, André Schöning, Dirk Wiedner, and Yanwing Ng for the Mu3e collaboration — Physikalisches Institut, Universität Heidelberg
The Mu3e experiment will search for the lepton flavour violating decay of a positive muon into two positrons and an electron, which is suppressed to unobservable levels in the Standard Model. A signal would be a clear sign of new physics.
The aim is to reach a sensitivity for the branching ratio of 10−16. This requires high momentum resolution of the tracking detector. Since the muons will decay at rest on target the energy of the decay electrons is E ≤ 53 MeV. In this energy regime the momentum resolution is limited by multiple scattering in the detector material. Therefore, the entire detector, including the support structure and services, has to consist of as little material as possible. The main component of the Mu3e detector is a tracking detector consisting of four cylindrical layers of high-voltage monolithic active pixel sensors (HV-MAPS) that can be thinned to 50 µ m. A power consumption of 400 mW/cm2 is expected. To keep the material budget low, the detector will be cooled with gaseous helium.
In this talk results of experimental tests as well as computational fluid dynamics simulations of the Mu3e cooling system will be presented.