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The ATHENA X-ray Observatory is the second large-class mission in the ESACosmic Vision 2015-2025 science programme. One of the two on-board instrumentsis the X-IFU, an imaging spectrometer based on a large array of TESmicrocalorimeters. To reduce the particle-induced background, the spectrometerworks in combination with a Cryogenic Anticoincidence detector (CryoAC), placedless than 1 mm below the TES array. The last CryoAC single-pixel prototypes,namely AC-S7 and AC-S8, are based on large area (1 cm2) Silicon absorberssensed by 65 parallel-connected iridium TES. This design has been adopted toimprove the response generated by the athermal phonons, which will be used asfast anticoincidence flag. The latter sample is featured also with a network ofAluminum fingers directly connected to the TES, designed to further improve theathermals collection efficiency. In this paper we will report the main resultsobtained with AC-S8, showing that the additional fingers network is able toincrease the energy collected from the athermal part of the pulses (from the 6%of AC-S7 up to the 26 % with AC-S8). Furthermore, the finger design is able toprevent the quasiparticle recombination in the aluminum, assuring a fast pulserising front (L/R limited). In our road map, the AC-S8 prototype is the laststep before the development of the CryoAC Demonstration Model (DM), which willbe the detector able to demonstrate the critical technologies expected in theCryoAC development programme.

The Cryogenic AntiCoincidence detector for ATHENA X-IFU: assessing the role of the athermal phonons collectors in the AC-S8 prototype