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Search Publications

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Displaying 851 - 875 of 143775

Differential Measurements of an AC Source with a Josephson Arbitrary Waveform Synthesizer

August 30, 2024
Author(s)
Alain Rufenacht, Raegan Johnson, Anna Fox, Nathan Flowers-Jacobs, Charlie Burroughs, Samuel Benz, Paul Dresselhaus, STEPHANE SOLVE, Jesus Mejia
This paper describes differential sampling measurements of an ac source and a Josephson arbitrary waveform synthesizer (JAWS). A new iterative approach for aligning the phases of the JAWS and the source waveforms was implemented to minimize the

Digitizer Linearity Measurement with a Josephson Arbitrary Waveform Synthesizer

August 30, 2024
Author(s)
Jesus Mejia, Alain Rufenacht, Raegan Johnson, Anna Fox, Nathan Flowers-Jacobs, Samuel Benz, Paul Dresselhaus
This article examines the non-linearity and gain error of a commercial digitizer on the 100 mV range with a Josephson Arbitrary Waveform Synthesizer (JAWS) as a reference. Different digitizer input filter settings were studied, and the shortest aperture of

Drug Detection, Analysis, and Monitoring Workshop Report

August 30, 2024
Author(s)
Edward Sisco
This report is a summary of a workshop convened to capture the analytical and data challenges inherent to the detection, identification, and monitoring of illicit drugs in the United States – specifically highlighting current practices, challenges, and

Dual-Frequency-Bias Programmable Josephson Voltage Standard Circuit Design

August 30, 2024
Author(s)
Alain Rufenacht, Anna Fox, Paul Dresselhaus, Samuel Benz
This paper presents a new 2 V programmable Josephson voltage standard circuit with dual microwave frequency input. This design provides three main features: (1) output voltages with nanovolt resolution, (2) the ability to perform a microwave frequency self

Measuring VHF Detector Linearity using a Quantum-Based Source

August 30, 2024
Author(s)
Jeremy Thomas, Nathan Flowers-Jacobs, Anna Fox, Alain Rufenacht, Paul Dresselhaus
We demonstrate the use of a Josephson Arbitrary Waveform Synthesizer (JAWS) for linearity measurements of two instruments: an RF power sensor and a fast ADC. The VHF-JAWS source consists of a chip with 12,810Josephson junctions located in a cryocooler and

Optimization of Wye-D-Type Quantum Hall Resistance Standard

August 30, 2024
Author(s)
Yanfei Yang, Dean G. Jarrett, Alireza Panna, Albert Rigosi, David B. Newell, Randolph Elmquist, Cheng Hsueh Yang, Ngoc Thanh Mai Tran
Theoretically wye-delta transformation can be used to realize ultra-high resistances up to PΩ. For graphene-based quantum Hall array resistance standards fabricated to utilize the wye-delta transformation, a few challenges present themselves, including the

Progress in the Kibble Dynamic Force Reference

August 30, 2024
Author(s)
Jared Strait, Akobuije Chijioke
We present progress in the development of a dynamic force reference instrument (KDFR) based on the Kibble principle. We describe the operating principle and design of the KDFR and discuss how the design for alternating current (AC) force measurements

Pulse Patterns for the Josephson Arbitrary Waveform Synthesizer

August 30, 2024
Author(s)
Nathan Flowers-Jacobs, Raegan Johnson, Jeremy Thomas, Alain Rufenacht, Anna Fox, Paul Dresselhaus, Samuel Benz
Δ-sigma algorithms are used to determine the desired sequence of quantum-based voltage pulses used by the Josephson Arbitrary Waveform Synthesizer (JAWS) to create calculable voltage waveforms. We describe typical settings used for synthesizing JAWS audio

Single-cryostat integration of the quantum anomalous Hall and Josephson effects

August 30, 2024
Author(s)
Jason Underwood, Linsey Rodenbach, Ngoc Thanh Mai Tran, Alireza Panna, Zachary Barcikowski, Molly Andersen, Peng Zhang, Lixuan Tai, Randolph Elmquist, Dean Jarrett, David Goldhaber-Gordon, David Newell, Albert Rigosi
By directly integrating a quantum anomalous Hall resistor (QAHR) and a programmable Josephson voltage standard (PJVS) into a single cryostat, we have implemented a quantum electrical reference that provides a realization of the volt, ohm, and ampere in

Stability Study of ac Voltage Source using Josephson Voltage Standards

August 30, 2024
Author(s)
Ghislain Granger, Waldemar G. Kuerten Ihlenfeld, Alain Rufenacht, Nathan Flowers-Jacobs, Anna Fox, Raegan Johnson, Jesus Mejia
The stability of an ac voltage source fabricated at the National Research Council Canada (NRC) is investigated. NRC uses differential sampling to monitor the source voltage with respect to a step-wise approximated reference waveform generated by the

Assessing girth weld quality of pipeline steels and their susceptibility to hydrogen embrittlement

August 28, 2024
Author(s)
Zack Buck, Newell Moser, Nicholas Derimow, May Ling Martin, Damian Lauria, Enrico Lucon, Douglas Stalheim, Peter Bradley, Matthew Connolly
Hydrogen has long been considered a viable carbon-free option for ever-increasing societal desires to transform our energy infrastructure towards more renewable and alternative technologies. However, the effects of hydrogen-assisted damage mechanisms that

Continuum of Spin Excitations in the Exactly Solvable Triangular-Lattice Spin Liquid CeMgAl11O19

August 28, 2024
Author(s)
Bin Gao, Tong Chen, Chunxaio Liu, Mason Klemm, Shu Zhang, Zhen Ma, Xianghan Xu, CHOONGJAE WON, Dongzhe Dai, Gregory McCandless, Maiko Kofu, Naoki Murai, Stephen Moxim, Jason Ryan, Xiaozhou Huang, Xiaoping Wang, Julia Chan, Shiyan Li, Sang-Wook Cheong, Oleg Tchernyshyov, Leon Balents, Pengcheng Dai
In magnetically ordered insulators, elementary quasiparticles manifest as spin waves - collective motions of localized magnetic moments that propagate through the lattice - observed via inelastic neutron scattering. In effective spin- 1/2 systems where

Mechanical Metallurgy on Columbia Gas X100 Experimental Pipe

August 28, 2024
Author(s)
Dash Weeks, Ryan White, Jake Benzing, Enrico Lucon, Nicholas Derimow, Ashley Kroon, Robert Smith
This study evaluates the material properties of an X100 pipeline steel extracted from an experimental transmission pipeline section placed into service in the 1960s. The purpose is to compare these properties with current X100 steel standards

Multifaceted Neuroimaging Data Integration via Analysis of Subspaces

August 28, 2024
Author(s)
Andrew Ackerman, Zhengwu Zhang, Jan Hannig, Jack Prothero, J.S. Marron
Neuroimaging studies, such as the Human Connectome Project (HCP), often collect multifaceted and multi-block data to study the complex human brain. However, these data are often analyzed in a pairwise fashion, which can hinder our understanding of how

Wafer-scale fabrication of evacuated alkali vapor cells

August 28, 2024
Author(s)
Yang Li, Matthew Hummon, Susan Schima, John Kitching, DONGGYU SOHN
We describe a process for fabricating a wafer-scale array of alkali metal vapor cells with low residual gas pressure. We show that by etching long, thin channels between the cells on the Si wafer surface, the residual gas pressure in the evacuated vapor

Extensive hydrogen incorporation is not necessary for superconductivity in topotactically reduced nickelates

August 27, 2024
Author(s)
Purnima P. Balakrishnan, Dan F. Segedin, Lin E. Chow, P. Quarterman, Shinichiro N. Muramoto, Mythili Surendran, Ranjan K. Patel, Harrison LaBollita, Grace A. Pan, Qi Song, Yang Zhang, Ismail El Baggari, Koushik Jagadish, Yu-Tsun Shao, Berit H. Goodge, Lena F. Kourkoutis, Srimanta Middey, Antia S. Botana, Jayakanth Ravichandran, A. Ariando, Julia Mundy, Alexander Grutter
A key open question in the study of layered superconducting nickelate films is the role that hydrogen incorporation into the lattice plays in the appearance of the superconducting state. Due to the challenges of stabilizing highly crystalline square planar

Integrating Crystallographic and Computational Approaches to Carbon-Capture Materials for the Mitigation of Climate Change

August 27, 2024
Author(s)
Eric J. Cockayne, Austin McDannald, Winnie Wong-Ng, Yu-Sheng Chen, Felipe Gandara Barragan, Jason Benedict, Christopher H. Hendon, David A. Keen, Ute Kolb, Lan Li, Shengqian Ma, William Morris, Aditya Nandy, Tomce Runcevski, Mustapha Soukri, Anuroop Sriram, Janice A. Steckel, John Findley, Chris Wilmer, Taner N. Yildirim, Wei Zhou, Igor Levin, Craig Brown
This article presents an overview of the current state of the art in the structure determination of microporous carbon-capture materials, as discussed at the recent NIST workshop "Integrating Crystallographic and Computational Approaches to Carbon-Capture

Mapping Industrial Wireless Deployments onto Individual Use Cases

August 27, 2024
Author(s)
Mohamed Hany, Rick Candell
Industrial wireless is crucial for the vision of increased intelligence in industrial automation and enhanced connectivity in various industrial scenarios. Although general requirements are usually defined for deploying industrial wireless networks in

Optically-induced quantum transitions in direct-probed mesoscopic 2H-NbSe2 for prototypical bolometers

August 26, 2024
Author(s)
Kishan Jayanand, Gustavo Saenz, Sergiy Krylyuk, Albert Davydov, Goran Karapetrov, Zhonghe Liu, Weidong Zhou, Anupama Kaul
Superconducting transition-edge sensors (TES) have emerged as fascinating devices to detect broadband electromagnetic radiation with low thermal noise. Extensive investigation into novel TES device architectures using conventional elemental or compound
Displaying 851 - 875 of 143775
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