Speaker
Description
Several configurations of a highly compact electromagnetic sampling calorimeter prototype, developed for future Higgs factories and strong-field QED experiments, were tested at the DESY-II testbeam facility. The prototype comprises flat tungsten absorber plates interspersed with 320-µm thick silicon sensor planes. Each 9×9 cm2 sensor is segmented into 256 readout pads. The sensors are glued to flexible PCB films and connected to readout electronics mounted on top of the sensor planes. An aluminium mechanical structure, dedicatedly designed for the LUXE experiment, ensures highly precise alignment of all modules. This prototype minimizes lateral air gaps between planes, thereby reducing the effective Molière radius and improving the expected detector performance. Electron impact points are measured by the new ALPIDE-based telescope, enabling detailed studies of shower profiles, position and energy resolutions, and also the impact of gaps between active volumes. Preliminary results on the performance will be reported.