skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Apparatus and method for critical current measurements

Abstract

An apparatus for the measurement of the critical current of a superconductive sample, e.g., a clad superconductive sample, the apparatus including a conductive coil, a means for maintaining the coil in proximity to a superconductive sample, an electrical connection means for passing a low amplitude alternating current through the coil, a cooling means for maintaining the superconductive sample at a preselected temperature, a means for passing a current through the superconductive sample, and, a means for monitoring reactance of the coil, is disclosed, together with a process of measuring the critical current of a superconductive material, e.g., a clad superconductive material, by placing a superconductive material into the vicinity of the conductive coil of such an apparatus, cooling the superconductive material to a preselected temperature, passing a low amplitude alternating current through the coil, the alternating current capable of generating a magnetic field sufficient to penetrate, e.g., any cladding, and to induce eddy currents in the superconductive material, passing a steadily increasing current through the superconductive material, the current characterized as having a different frequency than the alternating current, and, monitoring the reactance of the coil with a phase sensitive detector as the current passed through the superconductive material ismore » steadily increased whereby critical current of the superconductive material can be observed as the point whereat a component of impedance deviates.« less

Inventors:
 [1];  [2]
  1. Espanola, NM
  2. Los Alamos, NM
Issue Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
868412
Patent Number(s):
5134360
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10S - TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; method; critical; current; measurements; measurement; superconductive; sample; clad; including; conductive; coil; means; maintaining; proximity; electrical; connection; passing; amplitude; alternating; cooling; preselected; temperature; monitoring; reactance; disclosed; process; measuring; material; placing; vicinity; capable; generating; magnetic; field; sufficient; penetrate; cladding; induce; eddy; currents; steadily; increasing; characterized; frequency; phase; sensitive; detector; passed; increased; whereby; observed; whereat; component; impedance; deviates; current measurement; superconductive sample; cooling means; eddy current; conductive material; magnetic field; alternating current; critical current; apparatus including; electrical connection; eddy currents; superconductive material; selected temperature; sensitive detector; preselected temperature; phase sensitive; connection means; clad superconductive; current passed; current measurements; induce eddy; conductive coil; current pass; /324/505/

Citation Formats

Martin, Joe A, and Dye, Robert C. Apparatus and method for critical current measurements. United States: N. p., 1992. Web.
Martin, Joe A, & Dye, Robert C. Apparatus and method for critical current measurements. United States.
Martin, Joe A, and Dye, Robert C. Wed . "Apparatus and method for critical current measurements". United States. https://www.osti.gov/servlets/purl/868412.
@article{osti_868412,
title = {Apparatus and method for critical current measurements},
author = {Martin, Joe A and Dye, Robert C},
abstractNote = {An apparatus for the measurement of the critical current of a superconductive sample, e.g., a clad superconductive sample, the apparatus including a conductive coil, a means for maintaining the coil in proximity to a superconductive sample, an electrical connection means for passing a low amplitude alternating current through the coil, a cooling means for maintaining the superconductive sample at a preselected temperature, a means for passing a current through the superconductive sample, and, a means for monitoring reactance of the coil, is disclosed, together with a process of measuring the critical current of a superconductive material, e.g., a clad superconductive material, by placing a superconductive material into the vicinity of the conductive coil of such an apparatus, cooling the superconductive material to a preselected temperature, passing a low amplitude alternating current through the coil, the alternating current capable of generating a magnetic field sufficient to penetrate, e.g., any cladding, and to induce eddy currents in the superconductive material, passing a steadily increasing current through the superconductive material, the current characterized as having a different frequency than the alternating current, and, monitoring the reactance of the coil with a phase sensitive detector as the current passed through the superconductive material is steadily increased whereby critical current of the superconductive material can be observed as the point whereat a component of impedance deviates.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1992},
month = {1}
}

Patent:

Save / Share: