Progress in Superconductivity

The Korean Superconductivity Society (한국초전도학회)
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Heat Flow Studies in Low Temperature Detectors

저온검출기의 열전도 연구

  • Kim, Il-Hwan (Korea Research Institute of Standards and Science (KRISS)) ;
  • Lee, Min-Kyu (Korea Research Institute of Standards and Science (KRISS)) ;
  • Kim, Yong-Hamb (Korea Research Institute of Standards and Science (KRISS))
  • Received : 2010.09.02
  • Accepted : 2010.10.04
  • Published : 2010.10.31
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Abstract

Low temperature micro-calorimeters have been employed in the field of high resolution alpha spectrometers. These alpha detectors typically consist of a superconducting or metal absorber and a temperature sensor. The temperature sensor can be a transition edge sensor (TES), a metallic magnetic calorimeter (MMC) or other low temperature detectors for an accurate measurement of temperature change due to an alpha particle absorption. We report a recent study of the heat flow between a replaceable absorber and a temperature sensor. A piece of gold foil in $2.4{\times}2.7{\times}0.03\;mm^3$ is used as an absorber. A $40\;{\mu}m$ diameter Au:Er paramagnetic sensor is attached to another small piece of gold foil in $400{\times}200{\times}30\;{\mu}m^3$ to serve as the temperature sensor. This sensor assembly, Au:Er and gold foil, is placed on a miniature SQUID susceptometer in a gradiometric configuration. The thermal connection between the absorber and the sensor was made with three gold bonding wires. The measured thermal conductance shows a linear dependence to the temperature. The values are in a good agreement with Wiedemann-Franz type thermal conductance of the gold wires.

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