Würzburg 2018 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 89: Detektorsysteme III

T 89.8: Vortrag

Donnerstag, 22. März 2018, 18:15–18:30, Z6 - SR 2.007

Helium Cooling System for the Mu3e Experiment — •Constantin Tormann for the Mu3e collaboration — Physikalisches Institut, Universität Heidelberg

The Mu3e experiment will search for the charged lepton flavour violating decay µ→ e e e with a target sensitivity of one in 10¹⁶ decays. To reach this sensitivity the Mu3e detector is based on a combination of a silicon pixel tracking system, a scintillating fibre detector and a scintillating tile detector. In order to minimize the effects of multiple coulomb scattering the detector and its cooling system require an ultra low material budget. Cooling with gaseous helium has been chosen as it offers a reasonable compromise between radiation length and cooling potential. For a maximum heat load of 400 mW/cm² dissipated by the pixel modules, the cooling system needs to be capable of keeping the temperature below 70^∘C and temperature gradients as low as possible.

Computational fluid dynamics (CFD) simulations have been used to study the cooling system. This method provides many insights into the temperature and pressure distribution, making it possible to optimize the design. To verify the computational results on the one hand and test the system for mechanical and thermal stress on the other hand, an experimental test stand has been designed.

After a general overview of the cooling system, this talk will focus on the results of the CFD simulations and present the latest progress on the experimental tests.