Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 41: DAQ, trigger and electronics II

T 41.7: Talk

Tuesday, March 16, 2021, 17:30–17:45, Tp

Development of a DC-DC converter for powering the Mu3e detector — •Sophie Gagneur for the Mu3e collaboration — Institute of Nuclear Physics, Johannes Gutenberg University Mainz

The Mu3e experiment under construction at the Paul Scherrer Institute, Switzerland, aims to search for the lepton flavour violating decay of a muon into one electron and two positrons with an ultimate sensitivity of one in 1016 muon decays.

The detector for the Mu3e experiment consists of High-Voltage Monolithic Active Pixel Sensors (HV-MAPS) combined with scintillating tiles and fibres. The detector ASICs need a supply voltage of around 2V. This voltage is generated from the 20V external supply via switching DC-DC converters. These buck converters must be able to operate within a magnetic field and provide a constant output voltage with a ripple of less than 10mV to guarantee a proper operation of the pixel sensors and timing detectors. A first version of the converter has been successfully tested in the laboratory and with a prototype pixel sensor. The second version of the Mu3e DC-DC converter has been designed and produced based on the findings from these tests. The innovations in the design of these converters include an improved output filter, a temperature interlock and a current sense measurement.