Development of FD-SOI cryogenic amplifier for application to STJ readout in COBAND project
Development of FD-SOI cryogenic amplifier for application to STJ readout in COBAND project
复制标题
开发 FD-SOI 低温放大器，用于 COBAND 项目中的 STJ 读出
DOI：
10.1109/vlsi-tsa51926.2021.9440090
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
他31名(COBAND collaboration)
中科院分区：
文献类型：
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作者：
Yuji Takeuchi;他31名(COBAND collaboration)
COBAND 是一个对宇宙背景中微子衰变进行实验研究的项目 [1] – [9] 。宇宙背景中微子的存在被理论宇宙学预测为大爆炸的遗迹。由于中微子被发现具有质量生成和它们之间的混合，因此较重的中微子有可能通过远红外光子衰变为较轻的中微子，尽管其寿命预计比宇宙的年龄长得多[10]。然而，宇宙背景中微子和中微子衰变都尚未通过实验确定。最重中微子的寿命仅给出了 10-12 年的下限。因此，我们寻找来自宇宙背景中微子衰变的光子。来自宇宙背景中微子衰变的光子预计会形成一个具有独特特征的光谱，根据最重的中微子质量，其波长约为 50μm，具有锐边。为了识别压倒性的黄道发射前景和宇宙红外背景的特征，光电探测器需要能够以足够的精度测量下午 50 点左右的 FIR 光谱。因此，我们的目标是开发一种具有远红外逐光子光谱测量能力的光电探测器。我们采用超导隧道结 (STJ) 传感器与低温放大器相结合进行信号读出，以最大限度地发挥 STJ 的潜力。
The COBAND is a project of an experimental search for the cosmic background neutrino decay [1] – [9] . The existence of the cosmic background neutrino is predicted as a relic of the big bang in the theoretical cosmology. Since the neutrino is found to have mass generations and mixing between them, a heavier neutrino is possible to decay to a lighter neutrino with a far-infrared photon, even though its lifetime is expected to be much longer than the age of the universe [10] . However, neither the cosmic background neutrino nor the neutrino decay is yet established experimentally. Only a lower limit in the order of 10 12 years is given on the heaviest neutrino lifetime. We, thus, search for photons which come from the cosmic background neutrino decays. The photons from the cosmic background neutrino decays are expected to shape a spectrum of a unique signature with a sharp edge at a wavelength of around 50μm depending on the heaviest neutrino mass. To identify the signature against the overwhelming zodiacal emission foreground as well as the cosmic infrared background, the photodetectors are required to have an ability to measure the FIR spectrum around 50pm with sufficient precision. Thus, we aim at developing a photodetector with capability of FIR photon-by-photon spectrometry. We employ superconducting tunnel junction (STJ) sensors in combination with cryogenic amplifiers for signal readout to maximize the potential of STJ.