Aachen 2019 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 90: Experimentelle Methoden III
T 90.4: Vortrag
Donnerstag, 28. März 2019, 16:45–17:00, S01
Polyimide aging studies for the Mu3e experiment — •Thomas Theodor Rudzki for the Mu3e collaboration — Physikalisches Institut, Universität Heidelberg
The Mu3e experiment is searching for the lepton flavour violating decay µ+ → e+ e− e+ with a sensitivity of 1 event in 1016 decays in phase II. Since the momentum resolution is limited by multiple Coulomb scattering low material budget is necessary. Therefore, the pixel tracker of Mu3e will use 50 µ m thin sensors glued on thin polyimide foils including all signal and power lines. This results in a radiation length of only X/X0=0.115 % per layer. The sensors will be cooled by gaseous helium, a low Z material.
There are indications from aerospace engineering that ionizing radiation in a dry and inert atmosphere gives rise to radiation damage, potentially impacting the mechanical structure. Potential instability of the support structure caused by decomposition of the polyimide foil would be a great danger for the whole experiment. The presence and time scale of the damaging process and its potential effect on the material properties and their relevance for the Mu3e experiment will be discussed in this talk. This includes simulation results of the energy deposited by low-momentum electrons in polyimide.