The Demonstration Model of the ATHENA X-IFU Cryogenic AntiCoincidence Detector

Abstract

The Cryogenic AntiCoincidence detector (CryoAC) of ATHENA X-IFU is designed to reduce the particle background of the instrument and to enable the mission science goals. It is a 4-pixel silicon microcalorimeter sensed by an Ir/Au TES network. We have developed the CryoAC demonstration model, a prototype aimed to probe the critical technologies of the detector, i.e., the suspended absorber with an active area of 1\xa0cm 2 ; the low energy threshold of 20\xa0keV; and the operation connected to a 50\xa0mK thermal bath with a power dissipation less than 40\xa0nW. Here, we report the test performed on the first CryoAC DM sample (namely, the AC-S10 prototype), showing that it is fully compliant with its requirements.