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Sangaroon S, Ogawa K, Isobe M, Kobayashi MI, Fujiwara Y, Kamio S, Seki R, Nuga H, Yamaguchi H, Osakabe M. Performance of the newly installed vertical neutron cameras for low neutron yield discharges in the Large Helical Device. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:083505. [PMID: 32872928 DOI: 10.1063/5.0010302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Accepted: 07/24/2020] [Indexed: 06/11/2023]
Abstract
Two new vertical neutron cameras characterized by high detection efficiency were developed on the Large Helical Device in order to observe poloidal structures of helically trapped beam ions created by the perpendicularly injected positive-ion based neutral beam (P-NB) and are newly operated since 2018. In this work, the neutron fields at the vertical neutron cameras are investigated using the Monte Carlo N-particle transport code to evaluate the performance of its collimators. The results indicate that neutrons are attenuated by the heavy concrete and are well collimated through the collimator to detectors. Neutron spectra at the detector position show over 99% of uncollided 2.45 MeV neutrons. Time evolution of neutron emission profiles during the short pulse of P-NB injection is measured by the vertical neutron cameras. Peaks on the neutron emission profiles corresponding to the helically trapped beam ion are successfully obtained, as designed. The decrease in line integrated neutron flux at the peak positions after the P-NB stops is consistent with the behavior of the total neutron emission rate measured by the neutron flux monitor.
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Affiliation(s)
- S Sangaroon
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
| | - K Ogawa
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
| | - M Isobe
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
| | - M I Kobayashi
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
| | - Y Fujiwara
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
| | - S Kamio
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
| | - R Seki
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
| | - H Nuga
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
| | - H Yamaguchi
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
| | - M Osakabe
- National Institute for Fusion Science, National Institutes of Natural Sciences, Toki 509-5292, Japan
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2
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Osakabe M, Takeiri Y, Morisaki T, Motojima G, Ogawa K, Isobe M, Tanaka M, Murakami S, Shimizu A, Nagaoka K, Takahashi H, Nagasaki K, Takahashi H, Fujita T, Oya Y, Sakamoto M, Ueda Y, Akiyama T, Kasahara H, Sakakibara S, Sakamoto R, Tokitani M, Yamada H, Yokoyama M, Yoshimura Y. Current Status of Large Helical Device and Its Prospect for Deuterium Experiment. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.1080/15361055.2017.1335145] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- M. Osakabe
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - Y. Takeiri
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - T. Morisaki
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - G. Motojima
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - K. Ogawa
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - M. Isobe
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - M. Tanaka
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - S. Murakami
- Kyoto University, Department of Mechanical Engineering and Science, Kyoto 615-8540, Japan
| | - A. Shimizu
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - K. Nagaoka
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - H. Takahashi
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - K. Nagasaki
- Kyoto University, Institute of Advanced Energy, Gokasho, Uji, Kyoto 611-0011, Japan
| | - H. Takahashi
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - T. Fujita
- Nagoya University, Department of Energy Engineering and Science, Graduate School of Engineering, Furo-cho, Chikusa-ku, Nagoya 464-8093, Japan
| | - Y. Oya
- Shizuoka University, Radioscience Research Laboratory, Faculty of Science, 836, Ohya, Suruga-ku, Shizuoka 422-8529, Japan
| | - M. Sakamoto
- University of Tsukuba, Plasma Research Center, Tsukuba, Ibaraki 305-8577, Japan
| | - Y. Ueda
- Osaka University, Graduate School of Engineering, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - T. Akiyama
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - H. Kasahara
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - S Sakakibara
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - R. Sakamoto
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - M. Tokitani
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - H. Yamada
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - M. Yokoyama
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
- SOKENDAI (The Graduate University for Advanced Studies), 322-6 Oroshi-cho, Toki 509-5292, Japan
| | - Y. Yoshimura
- National Institute for Fusion Science, Natural Institutes of Natural Sciences, 322-6 Oroshi-cho, Toki 509-5292, Japan
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3
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Yamada H, Kawahata K, Mutoh T, Ohyabu N, Takeiri Y, Imagawa S, Ida K, Mito T, Nagayama Y, Shimozuma T, Watanabe KY, Kobayashi M, Kumazawa R, Masuzaki S, Morisaki T, Miyazawa J, Nagaoka K, Narushima Y, Sakakibara S, Sakamoto R, Toi K, Yokoyama M, Kaneko O, Komori A, Motojima O. Progress in the Integrated Development of the Helical System. FUSION SCIENCE AND TECHNOLOGY 2017. [DOI: 10.13182/fst10-a10789] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- H. Yamada
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Kawahata
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Mutoh
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - N. Ohyabu
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Takeiri
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Imagawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Ida
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Mito
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Nagayama
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Shimozuma
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Y. Watanabe
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Kobayashi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - R. Kumazawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Masuzaki
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - T. Morisaki
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - J. Miyazawa
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Nagaoka
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - Y. Narushima
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - S. Sakakibara
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - R. Sakamoto
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - K. Toi
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - M. Yokoyama
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - O. Kaneko
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - A. Komori
- National Institute for Fusion Science, Toki 509-5292, Japan
| | - O. Motojima
- National Institute for Fusion Science, Toki 509-5292, Japan
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