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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.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Dynamics of hysteretic resistive-SQUIDs: Catastrophe and confusion in the quest for the Kelvin./
作者:
Thomasson, Susanne Lyn.
面頁冊數:
405 p.
附註:
Source: Dissertation Abstracts International, Volume: 63-12, Section: B, page: 5907.
Contained By:
Dissertation Abstracts International63-12B.
標題:
Physics, Condensed Matter. -
電子資源:
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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Source: Dissertation Abstracts International, Volume: 63-12, Section: B, page: 5907.
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Adviser: Christopher M. Gould.
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Thesis (Ph.D.)--University of Southern California, 2002.
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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 ≡ 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.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3073856
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