A refrigerated Dewar for the Josephson array voltage calibration system
نویسندگان
چکیده
منابع مشابه
Operation of NIST Josephson Array Voltage Standards
This paper begins with a brief discussion of the physical principles and history of Josephson effect voltage standards. The main body of the paper deals with the practical details of the array design, cryoprobe construction, bias source requirements, adjustment of the system for optimum performance, calibration algorithms, and an assessment of error sources for the NIST-developed Josephson arra...
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Traditional calibration of dc voltage high accuracy digital voltmeters (DVMs) using conventional and Programmable Josephson Voltage Standards at INMETRO show improvements between 73.7 % and 98.3 % when compared with a regular calibration technique. Some calibration results as well as DVM linearity and gain drift analysis (up to 10 V range) are presented and discussed in this paper.
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We describe a simple dynamical model for an underdamped Josephson junction array coupled to a resonant cavity. From numerical solutions of the model in one dimension, we find that ~i! current-voltage characteristics of the array have self-induced resonant steps ~SIRS!, ~ii! at fixed disorder and coupling strength, the array locks into a coherent, periodic state above a critical number of active...
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We have developed a programmable Josephson voltage standard based on an array of superconductor–insulator–superconductor junctions. The junctions are damped by an external frequency-dependent shunt circuit, which allows operation at Shapiro steps with n.1. We derive optimization criteria for the design parameters for a fast and stable array with low power consumption. An array able to generate ...
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Numerical simulations of the current-voltage characteristics of an ordered two-dimensional Josephson junction array at an irrational flux quantum per plaquette are presented. The results are consistent with an scaling analysis which assumes a zero temperature vortex glass transition. The thermal correlation length exponent characterizing this transition is found to be significantly different fr...
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ژورنال
عنوان ژورنال: IEEE Transactions on Instrumentation and Measurement
سال: 1991
ISSN: 0018-9456
DOI: 10.1109/tim.1990.1032950