Speaker
Description
Prototype of a highly compact electromagnetic sampling calorimeter dedicated to positron flux measurement at the LUXE experiment, was tested at the DESY-II testbeam facility. The prototype was built of tungsten plates of 1 Xo (3.5 mm) instrumented with thin silicon sensors segmented into 5.5×5.5 mm2 readout pads. Presented in this contribution is the novel alignment method which allows to extract sensor positions inside the calorimeter with high precision, even for ''deep'' sensor layers, based on high statistics of electron data taken with ALPIDE-based telescope. Precise determination of the internal geometry of the calorimeter is crucial for the analysis of the electromagnetic cascade development, for extraction of the effective Molière radius in particular.