High granularity noble liquid calorimetry will be essential for future accelerator experiments, due to its radiation hardness, stability, high resolution energy measurement, high position resolution, timing resolution and high granularity (allowing 3D imaging, pile-up suppression, particle ID, jet substructure and more).

The idea of a high-granularity calorimeter is also part of the reference design of an FCC-hh experiment. The task comprised four research activities, namely: a) Development of multi-layer electrode PCBs that help adjust the granularity of the calorimeter, b) Detailed studies of timing resolution to understand the physics possibilities that future noble liquid calorimeters can offer, c) Measure and simulate LAr properties and calorimeter performance under high ionization rates covering space charge build-up, initial and bulk recombination, surface charge accumulation and the role of impurities and finally d) development of new high-density feedthroughs (FT) exploring synergies with industry and with neutrino experiments.