SFQ digital signal processing circuits for multi-quantum beam detectors using STJ array with neutron absorbers

H. Myoren, Y. Akamatsu, R. Sasaki, Shoji Sato, M. Naruse, T. Taino
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Abstract

We studied multi-quantum beam detectors using a superconducting tunnel junction (STJ) array with neutron absorbers. Using a neutron absorber for each of the STJs, we expected the STJ detector to exhibit a high spatial resolution and high detection efficiency for neutrons as well as radiative beams such as X-rays. To obtain diffraction patterns of the X-ray and neutrons, we propose the use of a multi-quantum beam detector using an STJ array and single flux quantum (SFQ) signal processing at low temperature because of its high-speed and low-power operation. The kinetic energy is determined for individual neutrons using time-of-flight-methods that employ SFQ time-to-digital converters (TDCs). To separately detect α-particles and γ-ray particles that are produced by the nuclear reaction between neutrons and boron, and X-ray photons, excess quasi-particle currents of the STJ detectors are processed by V/F type analog-to-digital converters and T-FF binary counters using SFQ digital circuits. To obtain the multiplexed readout of an STJ detector array, we designed a current bias switching circuit controlled by an SFQ driver for time-domain multiplexing. We designed the main circuits for this SFQ signal processing system and fabricated them using the ISTEC SRL Nb standard process II (STP2).
带中子吸收器的STJ阵列多量子束探测器SFQ数字信号处理电路
本文采用带中子吸收体的超导隧道结(STJ)阵列研究了多量子束探测器。利用每个STJ的中子吸收体,我们期望STJ探测器对中子和辐射光束(如x射线)表现出高空间分辨率和高探测效率。为了获得x射线和中子的衍射图,我们建议使用使用STJ阵列和单通量量子(SFQ)信号处理在低温下的多量子束探测器,因为它的高速和低功耗工作。动能是确定为个别中子使用飞行时间的方法,采用SFQ时间到数字转换器(tdc)。为了分别检测中子与硼核反应产生的α-粒子和γ-射线粒子以及x射线光子,STJ探测器产生的多余准粒子电流由V/F型数模转换器和使用SFQ数字电路的T-FF二进制计数器进行处理。为了获得STJ探测器阵列的多路复用读出,我们设计了一个由SFQ驱动器控制的电流偏置开关电路,用于时域复用。我们设计了该SFQ信号处理系统的主电路,并使用isstec SRL Nb标准工艺II (STP2)制作了主电路。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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