Speaker
Description
We present initial results from measurements of a new multi-layer electromagnetic calorimeter prototype constructed as part of the CalVision R&D program on dual-readout calorimetry. The prototype comprises a main volume of BGO crystals arranged in a 5x5 matrix and a higher granularity front section composed of PbWO$_4$, providing good containment for multi-GeV-scale EM showers. Each BGO crystal is instrumented with four SiPMs to ensure a large light collection area. Optical filters, fast-shaping amplifiers, and 5 GS/s digitizers provide sampled waveforms allowing for differentiating Cherenkov and scintillation signal components. For the PbWO4 section each crystal is instrumented with a single SiPM channel, and signal amplitudes are recorded. The full readout consists of 100 and 49 channels for the rear and front sections, respectively. This talk will review the requirements for a hybrid (EM+Hadronic) dual-readout calorimeter as envisioned in IDEA detector concept, the design and testing of the EM calorimeter prototype, and first results from data taken with electrons in the DESY II Test Beam Facility at the end of August 2026.