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Title: Josephson junction Q-spoiler

Abstract

An automatic Q-spoiler comprising at least one Josephson tunnel junction connected in an LC circuit for flow of resonant current therethrough. When in use in a system for detecting the magnetic resonance of a gyromagnetic particle system, a high energy pulse of high frequency energy irradiating the particle system will cause the critical current through the Josephson tunnel junctions to be exceeded, causing the tunnel junctions to act as resistors and thereby damp the ringing of the high-Q detection circuit after the pulse. When the current has damped to below the critical current, the Josephson tunnel junctions revert to their zero-resistance state, restoring the Q of the detection circuit and enabling the low energy magnetic resonance signals to be detected.

Inventors:
 [1];  [2];  [1];  [1]
  1. Berkeley, CA
  2. Austin, TX
Issue Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
OSTI Identifier:
866544
Patent Number(s):
4733182
Assignee:
United States of America as represented by United States (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G01 - MEASURING G01R - MEASURING ELECTRIC VARIABLES
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
josephson; junction; q-spoiler; automatic; comprising; tunnel; connected; lc; circuit; flow; resonant; current; therethrough; detecting; magnetic; resonance; gyromagnetic; particle; energy; pulse; frequency; irradiating; critical; junctions; exceeded; causing; resistors; damp; ringing; high-q; detection; damped; below; revert; zero-resistance; restoring; enabling; signals; detected; tunnel junctions; josephson junction; current therethrough; tunnel junction; magnetic resonance; critical current; frequency energy; resonance signals; energy pulse; detection circuit; magnetic particle; lc circuit; junction connected; /324/327/331/

Citation Formats

Clarke, John, Hilbert, Claude, Hahn, Erwin L, and Sleator, Tycho. Josephson junction Q-spoiler. United States: N. p., 1988. Web.
Clarke, John, Hilbert, Claude, Hahn, Erwin L, & Sleator, Tycho. Josephson junction Q-spoiler. United States.
Clarke, John, Hilbert, Claude, Hahn, Erwin L, and Sleator, Tycho. Fri . "Josephson junction Q-spoiler". United States. https://www.osti.gov/servlets/purl/866544.
@article{osti_866544,
title = {Josephson junction Q-spoiler},
author = {Clarke, John and Hilbert, Claude and Hahn, Erwin L and Sleator, Tycho},
abstractNote = {An automatic Q-spoiler comprising at least one Josephson tunnel junction connected in an LC circuit for flow of resonant current therethrough. When in use in a system for detecting the magnetic resonance of a gyromagnetic particle system, a high energy pulse of high frequency energy irradiating the particle system will cause the critical current through the Josephson tunnel junctions to be exceeded, causing the tunnel junctions to act as resistors and thereby damp the ringing of the high-Q detection circuit after the pulse. When the current has damped to below the critical current, the Josephson tunnel junctions revert to their zero-resistance state, restoring the Q of the detection circuit and enabling the low energy magnetic resonance signals to be detected.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}

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