Future satellite-based experiments dedicated to the observation of high-energy gamma and
charged cosmic rays will increasingly rely on highly performing calorimetry, and their
physics performance will depend on the geometrical dimensions and the energy
resolution of the calorimeter.
Thus an important issue is the optimization of the geometrical
acceptance, the granularity and the absorption depth with respect to the total mass of the apparatus which is a crucial constraint for space based experiments.
The design studied in CaloCube satisfies those criteria while retaining a total
mass below 1.6 tons. It is a homogeneous calorimeter with active material
Cesium Iodide (CsI) crystals, whith a cubic and isotropic geometry, to be sensitive to particles
from every direction in space. Granularity is defined by the small size of the
cubic CsI crystals. The total radiation length in all directions is sufficient for measurement of electromagnetic particles, whilst the interaction length is sufficient to allow a precise reconstruction
of hadronic showers.
This configuration requires original solutions in the read-out system, which must cope with a verylarge dynamic range, and with calibration requirements that are tackled by a LED base system.
Results of prototypes built with different crystal materials in beam test with electrons, hadrons and muons are presented.