[Table of Contents]

Plasma and Fusion Research

Volume 2, S1116 (2007)

Regular Articles

Spatial Variation of the Foil Parameters from in Situ Calibration of the JT-60U Imaging Bolometer Foil
Homaira P. ARAGHY, Byron J. PETERSON, Hiromi HAYASHI, Shigeru KONOSHIMA1), Naoko ASHIKAWA, Dongcheol SEO2) and the JT-60U TEAM1)
National Institute for Fusion Science, Toki, Gifu 509-5292, Japan
1)
Japan Atomic Energy Agency, Naka, Ibaraki 311-0193 Japan
2)
National Fusion Research Center, Yuseong, Daejeon 305-806, Korea
(Received 7 December 2006 / Accepted 20 April 2007 / Published 20 November 2007)

Abstract

We obtained the local foil properties of the JT-60U imaging bolometer foil (a single graphite-coated gold foil with an effective area of 9 × 7 cm2 and a nominal thickness of 2.5 μm) such as the thermal diffusivity, κ, and the product of the thermal conductivity, k, and the thickness, tf , by calibrating some parts of the foil. Calibration of the foil was made in situ using a He-Ne laser (∼27 mW) as a known radiation source to heat the foil. The thermal images of the foil are provided by an infrared (IR) camera (microbolometer type). The parameters are determined by finite element modeling (FEM) of the foil temperature and comparing the solution to the experimental results. In this work we apply this calibration technique to investigate the spatial variation of the foil parameters. Significant variation in the local temperature rise of the foil due to local heating by the laser beam indicates a spatial variation of the foil parameters κ, k and tf. This variation is possibly due to nonuniformity in carbon coating and/or the thickness of the foil.

Keywords

calibration, He-Ne laser beam, local temperature, variation of the foil parameters, imaging, bolometer

DOI: 10.1585/pfr.2.S1116

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References

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This paper may be cited as follows:

Homaira P. ARAGHY, Byron J. PETERSON, Hiromi HAYASHI, Shigeru KONOSHIMA, Naoko ASHIKAWA, Dongcheol SEO and the JT-60U TEAM, Plasma Fusion Res. 2, S1116 (2007).