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 cm 2 ; the low energy threshold of 20 keV; and the operation connected to a 50 mK thermal bath with a power dissipation less than 40 nW. 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.

中文翻译：

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ATHENA X-IFU低温反符合探测器演示模型

ATHENA X-IFU 的低温反符合探测器 (CryoAC) 旨在减少仪器的粒子背景并实现任务科学目标。它是由 Ir/Au TES 网络感测的 4 像素硅微量热仪。我们开发了 CryoAC 演示模型，该模型旨在探索探测器的关键技术，即有效面积为 1 cm 2 的悬浮吸收体；20 keV的低能量阈值；并且该操作连接到功耗小于 40 nW 的 50 mK 热浴。在这里，我们报告了对第一个 CryoAC DM 样品（即 AC-S10 原型）进行的测试，表明它完全符合其要求。