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Topic Area: Quantum Electrical Measurements

Displaying records 41 to 50 of 300 records.
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41. AC Power Standard Using a Programmable Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 4/1/2009
Authors: Bryan C Waltrip, Bo Gong, Thomas L Nelson, Yicheng Wang, Charles J Burroughs, Alain Rufenacht, Samuel Paul Benz, Paul David Dresselhaus
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33201

42. Improvements in the NIST Johnson Noise Thermometry System
Topic: Quantum Electrical Measurements
Published: 4/1/2009
Authors: Samuel Paul Benz, Jifeng Qu, Horst Rogalla, D. R White, Paul David Dresselhaus, Weston Leo Tew, Sae Woo Nam
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33058

43. Operating Margins for a Pulse-Driven Josephson Arbitrary Waveform Synthesizer Using a Ternary Bit-Stream Generator
Topic: Quantum Electrical Measurements
Published: 4/1/2009
Authors: Ernest Houtzager, Samuel Paul Benz, Helko vanden Brom
Abstract: We describe measurements with a pulse-driven Josephson arbitrary waveform synthesizer (JAWS) that uses a ternary arbitrary bit-stream generator as the bias source. This system is meant to be used as an AC Josephson voltage standard (ACJVS). From thes ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33059

44. Precision Differential Sampling Measurements of Low-Frequency Synthesized Sine Waves with an AC Programmable Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 4/1/2009
Authors: Alain Rufenacht, Charles J Burroughs, Samuel Paul Benz, Paul David Dresselhaus, Bryan C Waltrip, Thomas L Nelson
Abstract: 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 de ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33051

45. Progress toward a 1 V Pulse-Driven AC Josephson Voltage Standard
Topic: Quantum Electrical Measurements
Published: 4/1/2009
Authors: Samuel Paul Benz, Paul David Dresselhaus, Alain Rufenacht, Norman F Bergren, Joseph R. Mr. (Joseph R.) Kinard Jr., Regis Landim
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33061

46. Systematic Error Analysis of Stepwise Approximated AC Waveforms Generated by Programmable Josephson Voltage Standards
Topic: Quantum Electrical Measurements
Published: 4/1/2009
Authors: Charles J Burroughs, Alain Rufenacht, Samuel Paul Benz, Paul David Dresselhaus
Abstract: We have measured stepwise-approximated sine waves generated by a Programmable Josephson Voltage Standard (PJVS) with several different output configurations. These data are analyzed to characterize the dominant error mechanisms for rms applications, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33063

47. EEEL Technical Accomplishments
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7568
Topic: Quantum Electrical Measurements
Published: 3/30/2009
Author: Erik M Secula
Abstract: This document describes the technical work of the Electronics and Electrical Engineering Laboratory. In this report, you will find that EEEL researchers are developing the world's most advanced sensors, providing advanced gamma ray imagers for astro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901701

48. Ultra-high resolution alpha particle spectroscopy using calorimetry
Topic: Quantum Electrical Measurements
Published: 9/23/2008
Authors: Robert Daniel Horansky, Joel Nathan Ullom, James A Beall, Gene C Hilton, Kent D Irwin, Don Dry, Beth Hastings, Stephen Lamont, Clifford R Rudy, Michael W Rabin
Abstract: Calorimetry has been used since the late 1700?s to measure the heat output of physical processes ranging from chemical reactions to the respiration of organisms . Calorimetry is performed by measuring the temperature change caused by heat release int ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=32940

49. Phase Locking Transition in a Chirped Superconducting Josephson Resonator
Topic: Quantum Electrical Measurements
Published: 9/12/2008
Authors: Jose Alberto Aumentado, Ofer Naaman, L Friedland, J.S. Wurtele, Irfan Siddiqi
Abstract: We observe a sharp threshold for autoresonant phase locking in a transmission line resonator embedded with a Josephson tunnel junction and driven with a purely ac, chirped microwave signal. When the drive amplitude is below a critical value, the re ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33039

50. Input Impedance and Gain of a Gigahertz Amplifer Using a DC SQUID in a Quarter Wave Resonator
Topic: Quantum Electrical Measurements
Published: 8/29/2008
Authors: Lafe F. Spietz, Kent D Irwin, Jose Alberto Aumentado
Abstract: Due to their superior noise performance, SQUIDs are an attractive alternative to high electron mobility transistors for constructing ultra low noise microwave amplifiers for cryogenic use. The primary problem to be overcome in designing such an amp ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=33066



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