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Dynamics of hysteretic resistive-SQU...

Thomasson, Susanne Lyn.

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Dynamics of hysteretic resistive-SQUIDs: Catastrophe and confusion in the quest for the Kelvin.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Dynamics of hysteretic resistive-SQUIDs: Catastrophe and confusion in the quest for the Kelvin./
Author:	Thomasson, Susanne Lyn.
Description:	405 p.
Notes:	Source: Dissertation Abstracts International, Volume: 63-12, Section: B, page: 5907.
Contained By:	Dissertation Abstracts International63-12B.
Subject:	Physics, Condensed Matter. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3073856
ISBN:	0493940707

Dynamics of hysteretic resistive-SQUIDs: Catastrophe and confusion in the quest for the Kelvin.
Thomasson, Susanne Lyn.

Dynamics of hysteretic resistive-SQUIDs: Catastrophe and confusion in the quest for the Kelvin. - 405 p.

Source: Dissertation Abstracts International, Volume: 63-12, Section: B, page: 5907.

Thesis (Ph.D.)--University of Southern California, 2002.

We have designed and constructed a primary thermometry system which is capable of operating at milliKelvin temperatures. Our system is composed of thin-film Superconducting QUantum Interference Devices (SQUIDs); the thermometer is a thin-film resistive-SQUID, whose signal is coupled to, and amplified by, a dc-SQUID on the same integrated circuit chip. The dc-SQUID is configured in a direct-readout flux-locked loop (FLL) which maintained a bandwidth in excess of 1 MHz with a white noise level less than 1.5 muphi√Hz over the temperature range of operation: from 4.2 K down to 1.4 K.

ISBN: 0493940707Subjects--Topical Terms:

1018743
Physics, Condensed Matter.

Dynamics of hysteretic resistive-SQUIDs: Catastrophe and confusion in the quest for the Kelvin.
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020 $a 0493940707
035 $a (UnM)AAI3073856
035 $a AAI3073856
040 $a UnM $c UnM
100 1 $a Thomasson, Susanne Lyn. $3 1926298
245 1 0 $a Dynamics of hysteretic resistive-SQUIDs: Catastrophe and confusion in the quest for the Kelvin.
300 $a 405 p.
500 $a Source: Dissertation Abstracts International, Volume: 63-12, Section: B, page: 5907.
500 $a Adviser: Christopher M. Gould.
502 $a Thesis (Ph.D.)--University of Southern California, 2002.
520 $a We have designed and constructed a primary thermometry system which is capable of operating at milliKelvin temperatures. Our system is composed of thin-film Superconducting QUantum Interference Devices (SQUIDs); the thermometer is a thin-film resistive-SQUID, whose signal is coupled to, and amplified by, a dc-SQUID on the same integrated circuit chip. The dc-SQUID is configured in a direct-readout flux-locked loop (FLL) which maintained a bandwidth in excess of 1 MHz with a white noise level less than 1.5 muphi√Hz over the temperature range of operation: from 4.2 K down to 1.4 K.
520 $a The resistive-SQUID is composed of a Josephson junction shunted by a resistor and inductor in series, which when current-biased above the critical current is driven to oscillate at a frequency proportional to the voltage across the junction. Thermal voltage fluctuations in the junction shunt resistor, due to Johnson noise, give rise to a broadening of the central frequency peak. This device operates as a primary thermometer because all the parameters connecting the temperature with the frequency spectrum are derived from the frequency measurement itself.
520 $a The resistive-SQUID was designed to operate in the hysteretic regime where the parameter betaL &equiv; 2piLIc/phi 0 is greater than unity. We incorporated an integrated on-chip critical current (Ic) control line over the Josephson junction so that beta L could be changed in-situ.
520 $a The central frequency and variance were measured over a range of temperatures. We observed that the central frequency as a function of bias current did not follow the simple resistively-shunted junction model. For a set frequency, we observed quasiperiodic noise peaks as a function of betaL, with a noise floor consistent with thermal noise. In addition, we measured an increase in noise with decreasing temperature.
520 $a Numerical simulations of the hysteretic resistive-SQUID equation of motion enabled a more accurate understanding of the device behavior. These simulations revealed that multiple branch solutions become available when beta L > 4.6. We argue that when these branches become energetically competitive, random selection of branches gives rise to excess noise.
590 $a School code: 0208.
650 4 $a Physics, Condensed Matter. $3 1018743
690 $a 0611
710 2 0 $a University of Southern California. $3 700129
773 0 $t Dissertation Abstracts International $g 63-12B.
790 1 0 $a Gould, Christopher M., $e advisor
790 $a 0208
791 $a Ph.D.
792 $a 2002
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3073856