Low Energy Characterization of Caliste HD, a Fine Pitch CdTe-Based Imaging Spectrometer

Caliste HD is a recently developed micro-camera designed for X and gamma-ray astronomy, based on a 1×1 cm² CdTe Schottky pixelated detector. Its entire surface is composed of 256 pixels, disposed on a 16 × 16 pixel array. This spectrometer is buttable on its 4 sides and can be used to create a large focal plane. It is also designed for space environment. Its IDeF-X front-end electronics has low power consumption, excellent noise performance and a wide dynamic range, from 2 keV to 1 MeV. Moreover, electronic noise performances of this device were optimized to set the low level energy threshold lower than 2 keV.