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Operation of a NbN-Based Programmable Josephson Voltage Standard Chip with a Compact Refrigeration System

Published

Author(s)

A. Shoji, Hirotake Yamamori, Mayumi Ishizaki, Samuel Benz, Paul Dresselhaus

Abstract

A refrigeration system was designed and constructed for realizing a liquid-He-free programmable Josephson voltage standard. The system is equipped with a two-stage Gifford-McMahon cooler, a heat radiation shield, a magnetic field shield, and semi-rigid coaxial cables to supply microwave power to a chip. The performance of the system was examined using a NbN-based 8-bit digital-to-analog converter (DAC) chip designed as a 1 V programmable voltage standard. When operated at 8.5 K on the cryocooler, constant-voltage steps with amplitudes greater than 1 mA were observed for every segment of junction arrays on the chip.
Citation
IEEE Transactions on Applied Superconductivity
Volume
13
Issue
2

Keywords

Josephson junction, NbN, refrigeration system, TiN, voltage standard, digital-to-analog converter

Citation

Shoji, A. , Yamamori, H. , Ishizaki, M. , Benz, S. and Dresselhaus, P. (2003), Operation of a NbN-Based Programmable Josephson Voltage Standard Chip with a Compact Refrigeration System, IEEE Transactions on Applied Superconductivity, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=30318 (Accessed February 23, 2024)
Created May 31, 2003, Updated October 12, 2021