Development of a Bright Polychromator for Thomson Scattering Measurements
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概要
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A bright polychromator for compact, efficient YAG Thomson scattering measurement was designed on the basis of ray-tracing calculations. The optical input of the polychromator is a 2-mm-diameter optical fiber with a numerical aperture of 0.37. High refractive index glass lenses with monolayer anti-reflection coatings were used to reduce aberration effects and achieve good efficiency. A fast, low-noise detection system consisting of an avalanche photodiode and operational amplifiers was designed and tested using YAG laser pulses; the measured full width at half maximum (FWHM) of the laser pulse was 10 ns. The measured noise was dominated by the thermal noise of the input resistance R (= 470 Ω) when the signal was low, and the shot noise became dominant when the number of detected photons was greater than about 500.
著者
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NARIHARA Kazumichi
National Insitute for Fusion Science
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Takase Yuichi
Graduate School Of Frontier Sciences The Univ. Of Tokyo
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Ejiri Akira
Graduate School Of Frontier Science University Of Tokyo
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HASEGAWA Makoto
Research Institute for Applied Mechanics, Kyushu University
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HIRATSUKA Junichi
Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan
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Yamaguchi Takashi
Graduate School Of Engineering Dept. Of Metallurgy University Of Tokyo
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NARIHARA Kazumichi
National Institute for Fusion Science,322-6 Oroshi-cho, Toki 509-5292, Japan
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HIRATSUKA Junichi
Graduate School of Science, The University of Tokyo
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TAKASE Yuichi
Graduate School of Frontier Science, University Tokyo, Kashiwa 277-8561, Japan
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HIRATSUKA Junichi
Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan
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