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Search Publications by: Samuel P. Benz (Fed)

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Displaying 151 - 175 of 289

Amorphous Nb-Si Barrier Junctions for Voltage Standard and Digital Applications

June 3, 2009
Author(s)
David I. Olaya, Paul Dresselhaus, Samuel Benz, Jon E. Bjarnason, Erich N. Grossman
Amorphous Nb-Si has been previously demonstrated as a Josephson junction barrier material for Nb-based superconducting voltage standard circuits, including both dc programmable and ac Josephson voltage standards operating at frequencies up to 20 GHz. This

Microwave Packaging for Voltage Standard Applications

June 3, 2009
Author(s)
Mike Elsbury, Charles J. Burroughs, Paul Dresselhaus, Zoya Popovic, Samuel Benz
Improvements to the packaging of Josephson Volt- age Standard (JVS) circuits have increased operating margins, reliability, and longevity of these systems. By using the "flip- chip-on-flex" technique, reliable chip and cryoprobe mounting have been

Tapered Transmission Lines with Dissipative Junctions

June 3, 2009
Author(s)
Paul D. Dresselhaus, Mike Elsbury, Samuel P. Benz
NIST is optimizing the design of a 10 V programmable Josephson voltage standard so that it uses less microwave power by use of fewer parallel-biased arrays with higher voltage per array. Increasing the voltage per array by adding more junctions is

Application of the Josephson effect in electrical metrology

June 1, 2009
Author(s)
Samuel P. Benz, Blaise Jeanneret
Over the last 30 years, metrology laboratories have used the quantum behavior of the Josephson effect to greatly improve voltage metrology. The following article reviews the history and present status of the research and development Josephson voltage

AC Power Standard Using a Programmable Josephson Voltage Standard

April 1, 2009
Author(s)
Bryan C. Waltrip, Bo Gong, Thomas L. Nelson, Yicheng Wang, Charles J. Burroughs, Alain Rufenacht, Samuel Benz, Paul Dresselhaus
This paper describes the implementation of a new quantum-based system for the generation of 120 V rms, 5 A rms, sinusoidal, active and reactive power over the 50 Hz to 400 Hz frequency range. The system accurately relates the spectral amplitudes and phases

Improvements in the NIST Johnson Noise Thermometry System

April 1, 2009
Author(s)
Samuel P. Benz, Jifeng Qu, Horst Rogalla, D. R. White, Paul D. Dresselhaus, Weston L. Tew, Sae Woo Nam
We have developed a Johnson noise thermometry (JNT) system that is calibrated by precision waveforms synthesized with a quantized voltage noise source (QVNS). Significant improvements to the QVNS and the cross-correlation measurement electronics have

Precision Differential Sampling Measurements of Low-Frequency Synthesized Sine Waves with an AC Programmable Josephson Voltage Standard

April 1, 2009
Author(s)
Alain Rufenacht, Charles J. Burroughs, Samuel P. Benz, Paul D. Dresselhaus, Bryan C. Waltrip, Thomas L. Nelson
We have developed a precision technique to measure sine wave sources with the use of a quantum-accurate ac programmable Josephson voltage standard. This paper describes a differential method that uses an integrating sampling voltmeter to precisely

Progress toward a 1 V Pulse-Driven AC Josephson Voltage Standard

April 1, 2009
Author(s)
Samuel P. Benz, Paul D. Dresselhaus, Alain Rufenacht, Norman F. Bergren, Joseph R. Kinard Jr., Regis Landim
We present a new record rms output voltage of 275 mV, which is a 25 % improvement over the maximum achieved with previous ac Josephson voltage standard (ACJVS) circuits. We demonstrate operating margins for these circuits and use them to measure the

High-speed Nb/Nb-Si/Nb Josephson junctions for superconductive digital electronics

December 1, 2008
Author(s)
David I. Olaya, Burm Baek, Paul Dresselhaus, Samuel Benz
Josephson junctions with cosputtered amorphous Nb-Si barriers are being developed at NIST for use in voltage standard circuits. These junctions have the potential for a wide range of applications beyond voltage standards because their electrical properties

Measurement Time and Statistics for a Noise Thermometer With a Synthetic-Noise Reference

August 1, 2008
Author(s)
David R. White, Samuel Benz, J Labenski, Sae Woo Nam, Jifeng Qu, H Rogalla, Weston L. Tew
This paper describes methods for reducing the statistical uncertainty in measurements made by noise thermometers using digital cross correlators, and in particular, for thermometers using pseudorandom noise for the reference signal. First, a discrete

Systematic-Error Signals in the AC Josephson Voltage Standard: Measurement and Reduction

June 30, 2008
Author(s)
Regis Landim, Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs
We investigate the dominant frequency-dependent systematic error signals (SES) in the ac Josephson voltage standard. We describe our error measurement technique and a number of methods to reduce the errors. Most importantly we found that a small change in

Design of a Turn-Key 10 V Programmable Josephson Voltage Standard System

June 13, 2008
Author(s)
Paul D. Dresselhaus, Mike Elsbury, Charles J. Burroughs, David I. Olaya, Samuel P. Benz, Norman F. Bergren, Robert E. Schwall, Zoya Popovic
NIST is designing a 10 V Programmable Josephson Voltage Standard (PJVS) system with an improved microwave design and arrays of stacked NbXSi1-x-barrier Josephson junctions. For this new design a ?ground-up? approach, was used which takes into account all

Improvements in the NIST Johnson Noise Thermometry System

June 9, 2008
Author(s)
Samuel Benz, Horst Rogalla, Rod White, Jifeng Qu, Paul Dresselhaus, Wes L. Tew, Sae Woo Nam
We have developed a Johnson noise thermometry system that is calibrated by precision waveforms synthesized with a quantum-accurate voltage noise source (QVNS). Significant improvements to the QVNS and the cross-correlation measurement electronics have

Precision Differential Sampling Measurements of Low-Frequency Voltages Synthesized with an AC Programmable Josephson Voltage Standard

June 9, 2008
Author(s)
Alain Rufenacht, Charles J. Burroughs, Samuel P. Benz, Paul D. Dresselhaus, Bryan C. Waltrip, Thomas L. Nelson
Sampling is a promising technique to compare the stepwise-approximated sine waves synthesized by an AC Programmable Josephson Voltage Standard to the sinusoidal voltages of a secondary source at low frequencies (a few hundred Hz or less). This paper

Progress toward a 1V Pulse-Driven AC Josephson Voltage Standard

June 9, 2008
Author(s)
Samuel Benz, Paul Dresselhaus, Norman F. Bergren, Regis Landim
We present a new record output voltage of 275 mVrms, which is a 25% improvement over the maximum achieved with previous ac Josephson voltage standard circuits. We demonstrate operating margins for these circuits and use them to measure the harmonic

Thermal Voltage Converter Calibrations Using a Quantum AC Standard

April 10, 2008
Author(s)
Thomas E. Lipe Jr., Joseph R. Kinard Jr., Yi-hua D. Tang, Samuel Benz, Charles J. Burroughs, Paul Dresselhaus
We report on the first-ever use of a quantum ac source to calibrate a thermal transfer standard as part of the NIST calibration service for such devices, with reductions in calibration uncertainty of as much as an order of magnitude over traditional ac-dc

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

April 7, 2008
Author(s)
Charles J. Burroughs, Samuel Benz, Paul Dresselhaus, Yonuk Chong, Bryan C. Waltrip, Thomas L. Nelson, J. Williams, D. Henderson, P. Patel, Luis Palafox, Ralf Behr
We are implementing a new standard for 60 Hz power based on precision sinusoidal reference voltages from two independent Programmable Josephson Voltage Standards (PJVS) (one for voltage and one for current). The NIST PJVS systems use series arrays of

Constraints on a Synthetic-Noise Source for Johnson Noise Thermometry

January 18, 2008
Author(s)
David R. White, Samuel Benz
Conventional Johnson noise thermometers based on switching correlators have conflicting matching requirements for the sensing resistance. To mitigate distortion effects in the correlator, the RT products of the two sensors must be the same, and to mitigate
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