Developing wide-area cryogenic light detectors with baseline resolution better than 20 eV is one of the priorities of next generation bolometric experiments searching for rare interactions, as the simultaneous read-out of the light and heat signals enables background suppression through particle identification. Among the proposed technological approaches for the phonon sensor, the naturally multiplexed Kinetic Inductance Detectors (KIDs) stand out for their excellent intrinsic energy resolution and reproducibility. The potential of this technique was proved by the CALDER project that reached a baseline resolution of 154 ± 7 eV RMS by sampling a 2 × 2 cm2 Silicon substrate with 4 Aluminum KIDs. In this paper, we present a prototype of Aluminum KID with improved geometry and quality factor. The design improvement, as well as the combined analysis of amplitude and phase signals, allowed to reach a baseline resolution of 82 ± 4 eV by sampling the same substrate with a single Aluminum KID.
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机译：研发基线分辨率高于20 eV的广域低温光探测器是下一代辐射热实验探索稀有相互作用的优先事项之一，因为同时读取光和热信号可以通过粒子识别来抑制背景。在提出的用于声子传感器的技术方法中，自然复用的动力学电感检测器（KID）以其出色的固有能量分辨率和可再现性而著称。 CALDER项目证明了该技术的潜力，该项目通过使用2个2 x 2 cm2的硅衬底和4个Aluminium KID采样达到了154±7 eV RMS的基线分辨率。在本文中，我们提出了具有改进的几何形状和品质因数的Aluminium KID原型。设计上的改进，以及对幅度和相位信号的组合分析，通过使用单个Aluminium KID对同一基板进行采样，使基线分辨率达到82±4 eV。
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