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Improvement on Infrared Imaging Video Bolometer by Laser Calibration Method

Muneji ITOMI, Byron J. PETERSON¹⁾, Yuji YAMAUCHI²⁾, Ryuichi SANO³⁾, Kiyofumi MUKAI¹⁾ and Shwetang N. PANDYA³⁾

Graduate School of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060-8628, Japan

1)

National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan

2)

Faculty of Engineering, Hokkaido University, Kita-13, Nishi-8, Kita-ku, Sapporo 060-8628, Japan

3)

Graduate University for Advanced Studies Department of Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan

(Received 10 December 2013 / Accepted 29 March 2014 / Published 10 June 2014)

Abstract

It is necessary to estimate and decrease energy losses while keeping a high performance plasma in a nuclear fusion reactor. Therefore radiation diagnostics are required to estimate the radiation loss as a part of the total energy loss. Our diagnostic, the InfraRed imaging Video Bolometer (IRVB), which has been used in Large Helical Device (LHD), JT-60U and KSTAR, measures the radiation loss from the plasma. First, a metal foil, which is apart of the diagnostic, absorbs radiation energy through an aperture and its temperature risesdue to this energy. An IR camera measures the 2D distribution of the temperature on the foil, then we obtain the irradiance intensity and distribution by solving the heat diffusion equation on the foil. The purpose of our study is the development of the foil calibration analysis with laser for measuring plasma radiation with an IRVB using a Finite Element Model (FEM). This paper shows the improvement from two viewpoints. The first one is from the spatial resolution, and second one isthe addition of the time dependent part in the heat diffusion equation with the IRVB calibration of the foil thermal diffusivity.

Copyright (c) 2014 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

Large Helical Device, infrared imaging, plasma diagnostics, IRVB, finite element model, laser calibration

DOI: 10.1585/pfr.9.3406080

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References

• [1] B.J. Peterson et al., Rev. Sci. Instrum. 74(3), 2040 (2003).
• [2] B.J. Peterson et al., Rev. Sci. Instrum. 77(10E515), S2095 (2006).
• [3] R. Sano et al., Plasma Fusion Res. 7, 2405039 (2012).

This paper may be cited as follows:

Muneji ITOMI, Byron J. PETERSON, Yuji YAMAUCHI, Ryuichi SANO, Kiyofumi MUKAI and Shwetang N. PANDYA, Plasma Fusion Res. 9, 3406080 (2014).