Fabrication of a Tantalum-Based Josephson Junction for an X-Ray Detector

Abstract

We evaluate the performance of a single flux quantum (SFQ) circuit and discuss its possible system-level application. First, we describe an optical-electrical-SFQ hybrid router system that is divided into three functions: an SFQ packet-routing function, a control function, and an optical transmission function. For the packet-switching core, we have developed a packet-switching architecture based on an internal speedup time-shifted Batcher Banyan approach. Our simulated results show that this architecture should provide good scalability and a low packet-loss rate. Additionally, we have fabricated an asynchronous pulse arbitration circuit. This circuit is a key component in our packet-switching system. The circuit synchronizes two asynchronous incoming signals without any global clock signals. It consists of a clock generator based on a ring oscillator and data latches. By measuring the average output voltage of the Josephson junction, we confirmed the output signal control by the clock at over 60 Gbps throughput.

Atomic Spectrometry Update. X-ray fluorescence spectrometry

“…These workers reported energy resolutions at 5.9 keV of 41, 58, 65 and 129 eV for devices with dimensions of 20620, 1006100, 2006200 and 5006500 mm 2 , respectively. Morohashi et al 28 reported the fabrication of a tantalum-based STJ, which was designed for its greater stopping power for higher energy X-rays. An improved internal method for suppressing background current was reported by Nakagawa et al, 29 who used a micro-machined microstrip coil rather than a conventional external electromagnet.…”