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Search Publications by: Charles J. Burroughs (Fed)

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Displaying 101 - 125 of 233

Performance of a Cryocooled Nb DC Programmable Voltage Standard at 4 K

December 3, 2007
Author(s)
Robert J. Webber, Charles J. Burroughs, Masoud Radparvar
We report on the performance of a 1 Volt DC programmable Josephson voltage standard (PJVS) operating on a commercially available Gifford-McMahon (G-M) cryocooler at 4 K. The NIST-fabricated niobium superconductor-normal metal-superconductor (SNS) junction

Design of SNS Josephson Arrays for High Voltage Applications

June 4, 2007
Author(s)
Paul Dresselhaus, Samuel Benz, Charles J. Burroughs, Norman F. Bergren, Yonuk Chong
The voltage from a single, microwave-biased Josephson junction is a small quantity; thus useful voltages are only generated through series arrays of many thousands of junctions. Arrays of superconductor-normal metal-superconductor junctions have been

Precision Measurements using a 300 mV Josephson Arbitrary Waveform Synthesizer

June 4, 2007
Author(s)
Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs, Norman F. Bergren
We have developed a Josephson Digital-to-Analog Converter, otherwise know as a Josephson Arbitrary Waveform Synthesizer, with 300 mV peak output voltage. This is the first system of its kind with demonstrated quantum accuracy. We will show precision

AC-DC Transfer Standard Measurements with an AC Josephson Voltage Standard

April 2, 2007
Author(s)
Samuel P. Benz, Charles J. Burroughs, Paul D. Dresselhaus, Norman F. Bergren, Thomas E. Lipe, Joseph R. Kinard Jr., Yi-hua Tang
In order to improve the NIST low-voltage calibration service for thermal voltage converters, we have constructed an ac Josephson voltage standard system that can synthesize accurate rms voltages up to 100 mV. Using this system, we synthesized dc voltages

Resistance-Based Scaling of LF-and MF-Band Thermal Noise Powers

April 1, 2007
Author(s)
John Labenski, Weston L. Tew, Sae Woo Nam, Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs
A conventional technique for scaling thermal noise power in Johnson Noise Thermometry (JNT) is via resistance ratios. We describe measurements in the low to medium frequency (LF/MF) bands using this approach via correlation methods in the frequency domain

100 mV ac-dc Transfer Standard measurements with a Pulse-driven AC Josephson Voltage Standard

July 14, 2006
Author(s)
Samuel P. Benz, Charles J. Burroughs, Paul D. Dresselhaus, Thomas E. Lipe, Joseph R. Kinard Jr.
In order to improve the low-voltage calibration service at NIST we have constructed an ac Josephson voltage standard system with a maximum rms output voltage of 100 mV. Using this system we synthesized sinewaves of various audio frequencies and measured ac

Development of a 60 Hz Power Standard using SNS Programmable Josephson Voltage Standards

July 14, 2006
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus, Yonuk Chong, Bryan C. Waltrip, Thomas L. Nelson, J. Williams
We are implementing a new standard for 60 Hz mains power based on precision sinusoidal reference voltages from two independent Programmable Josephson Voltage Standards (PJVS) (one for voltage and one for current). Our NIST PJVS systems are based on

100 mV AC-DC Transfer Standard Measurements Using An AC Josephson Voltage Standard

June 1, 2006
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus
NIST is implementing the Josephson arbitrary waveform synthesizer as an ac Josephson Voltage Standard (ACJVS). Over the past few years we have demonstrated precision measurements of synthesized sine waves at rms voltage amplitudes up to 170 mV. The system

Josephson junctions with nearly superconducting metal silicide barriers

November 23, 2005
Author(s)
Yonuk Chong, Nicolas Hadacek, Paul Dresselhaus, Charles J. Burroughs, Burm Baek, Samuel Benz
We present a detailed study of the electrical properties of Nb-based planar Josephson junctions with superconducting metal silicide barriers, TiSi2 and WSi2. While these non-hysteretic junctions are useful for voltage standard applications, they are also

Progress Toward Practical AC and DC Josephson Voltage Standards at NIST

September 21, 2005
Author(s)
Samuel Benz, Charles J. Burroughs, Paul Dresselhaus, Nicolas Hadacek, Yonuk Chong
For the past 10 years NIST has been developing the next generation of voltage standard systems based on arrays of normal-metal barrier Josephson junctions. We have developed stable, programmable dc standards capable of providing intrinsically stable

Silicide Barrier SNS Junctions for AC Josephson Voltage Standards

September 5, 2005
Author(s)
Paul Dresselhaus, Yonuk Chong, Nicolas Hadacek, Burm Baek, Michio Watanabe, Charles J. Burroughs, Samuel Benz
We have used MoSi2 barrier superconductor-normal-metal-superconductor (SNS) double stacked junctions to generate audio frequency ac waveforms with metrological accuracy. Circuits used in this experiment were two parallel arrays of 1280 stacks of 2

Flexible Cryo-packages for Josephson Devices

June 1, 2005
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus, Yonuk Chong, Hirotake Yamamori
We have developed a method of bonding superconductive integrated-circuit chips to interchangeable, microwave-compatible, flexible cryo-packages. This new 'flip-chip on flex' technology will greatly improve the service life and reliability of our Josephson