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The ATHENA X-IFU development program foresees to build and characterize aninstrument Demonstration Model (DM), in order to probe the system criticaltechnologies before the mission adoption. In this respect, we are nowdeveloping the DM of the X-IFU Cryogenic Anticoincidence Detector (CryoAC),which will be delivered to the Focal Plane Assembly (FPA) development team forthe integration with the TES array. Before the delivery, we will characterizeand test the CryoAC DM in our CryoLab at INAF/IAPS. In this paper we report themain results of the activities performed to improve our cryogenic test setup,making it suitable for the DM integration. These activities mainly consist inthe development of a mechanichal setup and a cryogenic magnetic shieldingsystem, whose effectiveness has been assessed by FEM simulations and ameasurement at warm. The preliminary performance test has been performed bymeans of the last CryoAC single pixel prototype, the AC-S8 pre-DM sample.

The Cryogenic AntiCoincidence detector for ATHENA X-IFU: improvement of the test setup towards the Demonstration Model