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dc superconducting quantum interference device based neodymium magnet displacement sensor for superfluid experiments
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10.1063/1.3129942
/content/aip/journal/rsi/80/5/10.1063/1.3129942
http://aip.metastore.ingenta.com/content/aip/journal/rsi/80/5/10.1063/1.3129942
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Conventional displacement sensor circuit. H1 and H2 are persistent current switches, and leads (1) and (2) are used for current injection. (b) Magnet displacement sensor circuit.

Image of FIG. 2.
FIG. 2.

Cell schematic. D: diaphragm (metallized), E: electrode, P: pickup coil (connected to a commercial dc SQUID outside of experimental cell), M: magnet. indicates a superfluid Josephson junction.

Image of FIG. 3.
FIG. 3.

(a) Pickup coil can be seen at the center of black Stycast. (b) Electrode is glued onto the pickup coil.

Image of FIG. 4.
FIG. 4.

(a) Magnet is glued to the back of a diaphragm. (b) Diaphragm is glued to the main cell piece, which houses the superfluid Josephson junction.

Image of FIG. 5.
FIG. 5.

Displacement sensor output vs bias voltage. Solid line is a fit.

Image of FIG. 6.
FIG. 6.

Capacitance change vs bias voltage. Solid line is a fit.

Image of FIG. 7.
FIG. 7.

Josephson oscillation frequency at vs bias voltage applied to drive the oscillation.

Image of FIG. 8.
FIG. 8.

Spectrum taken at with experimental cell full.

Image of FIG. 9.
FIG. 9.

Helmholtz mode. Bias voltage is applied at . The inset shows the overall transient behavior. Data taken at . Frequency is .

Image of FIG. 10.
FIG. 10.

Individual phase slips have been detected with the new sensor. Phase slip oscillation ends and the Helmholtz mode begins at . Data taken at .

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/content/aip/journal/rsi/80/5/10.1063/1.3129942
2009-05-05
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: dc superconducting quantum interference device based neodymium magnet displacement sensor for superfluid experiments
http://aip.metastore.ingenta.com/content/aip/journal/rsi/80/5/10.1063/1.3129942
10.1063/1.3129942
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