An extended Computed Tomography (CT) technique with a priori information based on Phillips-Tikhonov regularization has been developed to handle a high-contrast radiation distribution, which can result in large reconstruction errors in the region where radiation intensity is low, with few line of sight (LOS) data. Reference profiles generated from LOS data for every time slice are employed as the a priori information. In the extended technique, the weighting parameter for the reference profile is automatically determined from the LOS data, to avoid an inappropriate reference. The extended technique has been examined with a reconstruction test with the previously designed CT system using an infrared imaging video bolometer in JT-60SA. In the reconstructed profile of the high-contrast radiation distribution, the extended technique shows improvement of the weak radiation region, such as the scrape-off layer, without the deterioration of the strong radiation region, such as around the divertor. The results indicate that the extended CT technique can help to handle a high-contrast radiation distribution with few LOS data.
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September 2017
Research Article|
September 06 2017
Development of bolometric tomography technique for high-contrast radiation distribution in toroidal devices
Ryuichi Sano
;
Ryuichi Sano
1
Naka Fusion Institute, National Institutes for Quantum and Radiological Science and Technology
, Naka 311-0193, Japan
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Kiyofumi Mukai;
Kiyofumi Mukai
2
National Institute for Fusion Science, National Institutes of Natural Sciences
, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
3
SOKENDAI (The Graduate University for Advanced Studies)
, Hayama, Kanagawa 240-0193, Japan
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Byron J. Peterson;
Byron J. Peterson
2
National Institute for Fusion Science, National Institutes of Natural Sciences
, 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
3
SOKENDAI (The Graduate University for Advanced Studies)
, Hayama, Kanagawa 240-0193, Japan
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Masakatsu Fukumoto;
Masakatsu Fukumoto
1
Naka Fusion Institute, National Institutes for Quantum and Radiological Science and Technology
, Naka 311-0193, Japan
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Kazuo Hoshino
Kazuo Hoshino
1
Naka Fusion Institute, National Institutes for Quantum and Radiological Science and Technology
, Naka 311-0193, Japan
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Rev. Sci. Instrum. 88, 093504 (2017)
Article history
Received:
May 26 2017
Accepted:
August 19 2017
Citation
Ryuichi Sano, Kiyofumi Mukai, Byron J. Peterson, Masakatsu Fukumoto, Kazuo Hoshino; Development of bolometric tomography technique for high-contrast radiation distribution in toroidal devices. Rev. Sci. Instrum. 1 September 2017; 88 (9): 093504. https://doi.org/10.1063/1.5000951
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