Speaker
Description
The Mu3e Experiment aims to observe charged lepton flavor violation via the e+e-e+ channel with a Phase-I goal of single event sensitivity down to 2 10^-15 on the branching ratio. The experimental detector is being actively constructed and commissioned at the Paul Scherrer Institute (PSI), where it will be subjected to 10^8 muon stops per second at the piE5 beam-line. In order to sift through the background events and reduce multiple scattering, an ultra-thin detector with excellent vertex reconstruction performance and momentum resolution is required. Using HV-MAPS based MuPix 11 sensors at thicknesses down to 50 μm, the so-called Vertex Detector is made up of two layers of “ladders” with six chips each, concentric on the target. High Density Interconnects (HDIs) made up of aluminum traces and Kapton layers provide the electrical connections while keeping the radiation length to a minimum. A manual assembly procedure and dedicated air-cooled quality control (QC) setups have been developed for the production of the Vertex ladders. This poster will provide an overview on the assembly process and QC testing for the second iteration of the detector for a planned upcoming run in 2026.