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You searched on: Topic Area: Quantum Electrical Measurements

Displaying records 1 to 10 of 47 records.
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1. Josephson-Based Full Digital Bridge for High-Accuracy Impedance Comparisons
Topic: Quantum Electrical Measurements
Published: 6/24/2016
Authors: Frederic Overney, Nathan E Flowers-Jacobs, Blaise Jeanneret, Alain Rufenacht, Anna E Fox, Jason M Underwood, Andrew David Koffman, Samuel Paul Benz
Abstract: This paper describes a Josephson-based full digital impedance bridge capable of comparing any two impedances, regardless of type (R-C, R-L, or L-C), over a large frequency range. At the heart of the bridge are two Josephson arbitrary waveform syn ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=920738

2. Two Volt Josephson Arbitrary Waveform Synthesizer Using Wilkinson Dividers
Topic: Quantum Electrical Measurements
Published: 2/19/2016
Authors: Nathan E Flowers-Jacobs, Anna E Fox, Paul David Dresselhaus, Robert E Schwall, Samuel Paul Benz
Abstract: The root-mean-square (rms) output voltage of the NIST Josephson arbitrary waveform synthesizer (JAWS) has been doubled from 1 V to a record 2 V by combining two new 1 V chips on a cryocooler. This higher voltage will improve calibrations of ac therma ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=920103

3. 10 V Programmable Josephson Voltage Standard and its Application in Direct Comparison with the Conventional Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 8/17/2015
Authors: Yi-hua Tang, James Wachter, Alain Rufenacht, Gerald J FitzPatrick, Samuel Paul Benz
Abstract: This paper briefly describes the working principle of the 10 V programmable Josephson voltage standard (PJVS) that was developed at the National Institute of Standards and Technology (NIST) and how to use it in a direct comparison with a conventional ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916482

4. Cryocooled 10 V Programmable Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 12/11/2014
Authors: Alain Rufenacht, Logan A. Howe, Anna E Fox, Robert E Schwall, Paul David Dresselhaus, Charles J Burroughs, Samuel Paul Benz
Abstract: Implementation of programmable Josephson voltage standard (PJVS) circuits on cryocooler at 4 K is a challenge. The limited cooling power of the cryocoolers has to balance the heat dissipated by the PJVS circuit in order to maintain a stable tempe ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916564

5. Performance Improvements for the NIST 1 V Josephson arbitrary waveform synthesizer
Topic: Quantum Electrical Measurements
Published: 11/10/2014
Authors: Samuel Paul Benz, Steven Beyer Waltman, Anna E Fox, Paul David Dresselhaus, Alain Rufenacht, Logan A. Howe, Robert E Schwall, Nathan E Flowers-Jacobs
Abstract: The performance of the NIST Josephson arbitrary waveform synthesizer has been improved such that it generates a root-mean-square (RMS) output voltage of 1 V with an operating current range greater than 2 mA. Our previous 1 V JAWS circuit achieved ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916930

6. NIST 10 V Programmable Josephson Voltage Standard System Using a Low Capacity Cryocooler
Topic: Quantum Electrical Measurements
Published: 11/6/2014
Authors: Logan A. Howe, Anna E Fox, Alain Rufenacht, Charles J Burroughs, Paul David Dresselhaus, Samuel Paul Benz, Robert E Schwall
Abstract: Rising costs of and difficulty in obtaining liquid helium in many areas of the world provides strong motivation for cryogen-free operation of superconducting devices such as NIST Programmable Josephson Voltage Standard (PJVS) systems. However, op ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916468

7. A 100 Tohm Guarded Hamon Transfer Standard
Topic: Quantum Electrical Measurements
Published: 8/24/2014
Authors: Dean G Jarrett, Edward O'Brien, Marlin E Kraft
Abstract: Guarded Hamon transfer standards are used at NIST for scaling to high resistance levels. An improved design for a guarded Hamon transfer standard in the range from 1 TΩ to 100 TΩ is described. Measurements taken to select the primary and g ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915486

8. AC-DC Transfer Standard Measurements with a Josephson Arbitrary Waveform Synthesizer at 200 mV
Topic: Quantum Electrical Measurements
Published: 8/24/2014
Authors: Jason M Underwood, Alain Rufenacht, Steven Beyer Waltman, Charles J Burroughs, Paul David Dresselhaus, Samuel Paul Benz
Abstract: Thermal voltage converters and transfer standards are critical components in AC electrical metrology. In order to improve the low-voltage (< 1 V) calibration of such transfer standards at NIST, we have developed an AC Josephson voltage standard ( ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915405

9. Investigations on the measurement of the leakage resistance to ground of a NIST Programmable Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 8/24/2014
Authors: Stephane Solve, Regis Chayramy, Alain Rufenacht, Charles J Burroughs, Samuel Paul Benz
Abstract: The Programmable Josephson Voltage Standard (PJVS) leakage resistance to ground (LRG) is defined as the electrical resistance of one side of the measurement leads to ground. Under certain measurement conditions, this resistance can produce a sign ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915386

10. Measurement of the Boltzmann Constant with Noise Thermometry at NIM
Topic: Quantum Electrical Measurements
Published: 8/24/2014
Authors: Jifeng Qu, Kunli Zhou, Horst Rogalla, Samuel Paul Benz, Yunfeng Fu
Abstract: Since 2010 we have been developing a quantum-voltage-calibrated Johnson noise thermometer at NIM to measure the Boltzmann constant k. With recent improvements in grounding and shielding of the electronics, and matching of the noise sources and t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915384



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