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The X-IFU is the cryogenic spectrometer onboard the future ATHENA X-rayobservatory. It is based on a large array of TES microcalorimeters, which worksin combination with a Cryogenic AntiCoincidence detector (CryoAC). This isnecessary to reduce the particle background level thus enabling part of themission science goals. Here we present the first joint test of X-IFU TES arrayand CryoAC Demonstration Models, performed in a FDM setup. We show that it ispossible to operate properly both detectors, and we provide a preliminarydemonstration of the anti-coincidence capability of the system achieved by thesimultaneous detection of cosmic muons.

ATHENA X-IFU Demonstration Model: First joint operation of the main TES Array and its Cryogenic AntiCoincidence Detector (CryoAC)