Investigation of ASIC-based signal readout electronics for LEGEND-1000
Investigation of ASIC-based signal readout electronics for LEGEND-1000
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DOI：
10.1088/1748-0221/15/09/p09022
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发表时间：
2020-05
影响因子：
1.3
通讯作者：
F. Edzards;S. Mertens;L. Bombelli;G. Zuzel;D. Fink;S. Schönert;D. Radford;M. Green;M. Laubenstein;A. Alborini;G. Othman;M. Willers
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文献类型：
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作者：
F. Edzards;S. Mertens;L. Bombelli;G. Zuzel;D. Fink;S. Schönert;D. Radford;M. Green;M. Laubenstein;A. Alborini;G. Othman;M. Willers
LEGEND（英语：Large Enriched Germanium Experiment for Neutrinoless ββ Decay）是一个吨级的实验计划，以前所未有的灵敏度寻找同位素76 Ge中的无中微子双β（0νββ）衰变。在低背景76 Ge基GERDA和\textsc{Majorana Demonstrator}实验成功的基础上，LEGEND合作的目标是在衰变半衰期上超过1028年的信号发现灵敏度，暴露量约为10吨/年。靠近探测器的信号读出电子设备通过降低电子噪声和提高脉冲形状分析能力以抑制背景，在最大化实验发现灵敏度方面发挥着重要作用。然而，这种接近性也对电子设备的辐射安全性提出了独特的挑战。专用集成电路（ASIC）技术允许将整个电荷敏感放大器（CSA）实现到单个低质量芯片中，同时改善电子噪声并降低功耗。在这项工作中，我们研究了市售的ASIC CSA，XGLab CUBE探测器，以及p型点接触高纯锗探测器的属性和电子性能。我们表明，低噪声水平和优异的能量分辨率，可以获得这种读出。此外，我们证明了脉冲形状歧视技术减少背景事件的可行性。
LEGEND, the Large Enriched Germanium Experiment for Neutrinoless ββ Decay, is a ton-scale experimental program to search for neutrinoless double beta (0νββ) decay in the isotope 76Ge with an unprecedented sensitivity. Building on the success of the low-background 76Ge-based GERDA and \textsc{Majorana Demonstrator} experiments, the LEGEND collaboration is targeting a signal discovery sensitivity beyond 1028 yr on the decay half-life with approximately 10 t⋅yr of exposure. Signal readout electronics in close proximity to the detectors plays a major role in maximizing the experiment's discovery sensitivity by reducing electronic noise and improving pulse shape analysis capabilities for the rejection of backgrounds. However, the proximity also poses unique challenges for the radiopurity of the electronics. Application-specific integrated circuit (ASIC) technology allows the implementation of the entire charge sensitive amplifier (CSA) into a single low-mass chip while improving the electronic noise and reducing the power consumption. In this work, we investigated the properties and electronic performance of a commercially available ASIC CSA, the XGLab CUBE preamplifier, together with a p-type point contact high-purity germanium detector. We show that low noise levels and excellent energy resolutions can be obtained with this readout. Moreover, we demonstrate the viability of pulse shape discrimination techniques for reducing background events.