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 »
- Inventors:
-
- Espanola, NM
- Los Alamos, NM
- Issue Date:
- Research Org.:
- Los Alamos National Laboratory (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 G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES
- 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 = {Wed Jan 01 00:00:00 EST 1992},
month = {Wed Jan 01 00:00:00 EST 1992}
}