Speaker
Description
Presentation type: Oral.
Chromatic calorimetry (CCAL) is an emerging approach to homogeneous electromagnetic calorimetry based on longitudinally segmented scintillator layers emitting at distinct wavelengths [1]. A spectrally resolved readout allows discrimination of light from different layers, enabling reconstruction of the longitudinal development of electromagnetic showers. This concept leverages advances in quantum-engineered scintillators, such as nanocrystal-embedded in polymers, which provide narrow and tunable emission spectra for the fine segmentation in a CCAL configuration. This novel calorimetry approach could provide the tools needed to match the requirements of next-generation high-energy physics experiments, like FCC-ee.
This contribution presents results from a 2025 CERN Super Proton Synchrotron test beam campaign using electron beams from 10 to 120 GeV. The concept was validated with a single calorimeter cell based on commercial scintillators, serving as a baseline for future nanocomposite implementations. The prototype comprised three scintillator layers: EJ-228 (390 nm), EJ-262 (490 nm), and GAGG (540 nm), interleaved with PbF₂ crystals acting as transparent absorbers. The readout employed a multi-anode photomultiplier tube (MaPMT) with long-pass optical filters to isolate signals from each layer.
Results on shower development, particle identification, energy calibration, and energy resolution will be shown to demonstrate the potential of this approach for precision calorimetry. Prospects for implementation with nanocomposite scintillators will also be discussed, including the status of cesium lead halide nanocomposites.
- M. Doser et al., Front. Phys., 10, 887738 (2022).
- J. Král et al., J. Phys. Mater., 8, 015007 (2025).