Josephson junction Q-spoiler

Patent · Fri Jan 01 00:00:00 EST 1988

OSTI ID:866544

Clarke, John ^[1]; Hilbert, Claude ^[2]; Hahn, Erwin L ^[1]; Sleator, Tycho ^[1]

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1. Berkeley, CA
2. Austin, TX

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.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
• DOE Contract Number: AC03-76SF00098
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4733182
• OSTI ID: 866544
• Country of Publication: United States
• Language: English

Related Subjects

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
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