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Arikawa Y, Iwasa Y, Yamanoi K, Iwano K, Fujioka S, Iwamoto A, Nakai M, Hatano Y, Hara M, Akamaru S, Norimatsu T, Kodama R. Development of Tritium Tracer Doped Liquid Fuel Target for Inertial Confinement Fusion at the Gekko XII-LFEX Facility. FUSION SCIENCE AND TECHNOLOGY 2020. [DOI: 10.1080/15361055.2020.1716458] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Yasunobu Arikawa
- Osaka University, Institute of Laser Engineering, 2-6 Yamadaoka, Suita, Osaka, Japan
| | - Yuki Iwasa
- Osaka University, Institute of Laser Engineering, 2-6 Yamadaoka, Suita, Osaka, Japan
| | - Kohei Yamanoi
- Osaka University, Institute of Laser Engineering, 2-6 Yamadaoka, Suita, Osaka, Japan
| | - Keisuke Iwano
- Osaka University, Institute of Laser Engineering, 2-6 Yamadaoka, Suita, Osaka, Japan
| | - Shinsuke Fujioka
- Osaka University, Institute of Laser Engineering, 2-6 Yamadaoka, Suita, Osaka, Japan
| | - Akifumi Iwamoto
- National Institute of Fusion Science, 322-6, Oroshi Cho, Toki city, Gifu, Japan
| | - Mitsuo Nakai
- Osaka University, Institute of Laser Engineering, 2-6 Yamadaoka, Suita, Osaka, Japan
| | - Yuji Hatano
- University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
| | - Masanori Hara
- University of Toyama, 3190 Gofuku, Toyama 930-8555, Japan
| | | | - Takayoshi Norimatsu
- Osaka University, Institute of Laser Engineering, 2-6 Yamadaoka, Suita, Osaka, Japan
| | - Ryosuke Kodama
- Osaka University, Institute of Laser Engineering, 2-6 Yamadaoka, Suita, Osaka, Japan
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Abe Y, Nakajima N, Sakaguchi Y, Arikawa Y, Mirfayzi SR, Fujioka S, Taguchi T, Mima K, Yogo A, Nishimura H, Shiraga H, Nakai M. A multichannel gated neutron detector with reduced afterpulse for low-yield neutron measurements in intense hard X-ray backgrounds. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10I114. [PMID: 30399813 DOI: 10.1063/1.5039436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Accepted: 07/11/2018] [Indexed: 06/08/2023]
Abstract
A design of multichannel gated photomultiplier tube (PMT) is presented for the 960-channel neutron time-of-flight detector at the Institute of Laser Engineering of Osaka University. This is important for the fusion science and the nuclear photonics where intense hard X-rays are generated from the interaction of ultra-short laser pulse of petawatt power density with matter. The hard X-rays often overload PMTs and cause signal-induced background noises called afterpulses, making the detection of subsequent neutrons impossible. For this reason, the PMTs are coupled with an electrical time-gating (ETG) system to avoid overloading. The ETG system disables the PMT by modulating the dynode potential during the primary X-ray flash. An after-pulsing suppression technique is demonstrated by applying a reverse bias voltage between the photocathode and the first dynode. The presented multichannel scheme provides a gate response time of 80 ns, a signal cutoff ratio of 2.5 × 102, and requires reasonably low power consumption.
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Affiliation(s)
- Y Abe
- Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
| | - N Nakajima
- Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
| | | | - Y Arikawa
- Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
| | - S R Mirfayzi
- Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
| | - S Fujioka
- Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
| | - T Taguchi
- Setsunan University, Osaka 572-8508, Japan
| | - K Mima
- Graduate School for the Creation of New Photonics Industries, Shizuoka 431-1202, Japan
| | - A Yogo
- Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
| | - H Nishimura
- Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
| | - H Shiraga
- Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
| | - M Nakai
- Institute of Laser Engineering, Osaka University, Osaka 565-0871, Japan
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Kitagawa Y, Mori Y, Komeda O, Ishii K, Hanayama R, Fujita K, Okihara S, Sekine T, Satoh N, Kurita T, Takagi M, Watari T, Kawashima T, Kan H, Nishimura Y, Sunahara A, Sentoku Y, Nakamura N, Kondo T, Fujine M, Azuma H, Motohiro T, Hioki T, Kakeno M, Miura E, Arikawa Y, Nagai T, Abe Y, Ozaki S, Noda A. Direct heating of a laser-imploded core by ultraintense laser-driven ions. PHYSICAL REVIEW LETTERS 2015; 114:195002. [PMID: 26024175 DOI: 10.1103/physrevlett.114.195002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Indexed: 06/04/2023]
Abstract
A novel direct core heating fusion process is introduced, in which a preimploded core is predominantly heated by energetic ions driven by LFEX, an extremely energetic ultrashort pulse laser. Consequently, we have observed the D(d,n)^{3}He-reacted neutrons (DD beam-fusion neutrons) with the yield of 5×10^{8} n/4π sr. Examination of the beam-fusion neutrons verified that the ions directly collide with the core plasma. While the hot electrons heat the whole core volume, the energetic ions deposit their energies locally in the core, forming hot spots for fuel ignition. As evidenced in the spectrum, the process simultaneously excited thermal neutrons with the yield of 6×10^{7} n/4π sr, raising the local core temperature from 0.8 to 1.8 keV. A one-dimensional hydrocode STAR 1D explains the shell implosion dynamics including the beam fusion and thermal fusion initiated by fast deuterons and carbon ions. A two-dimensional collisional particle-in-cell code predicts the core heating due to resistive processes driven by hot electrons, and also the generation of fast ions, which could be an additional heating source when they reach the core. Since the core density is limited to 2 g/cm^{3} in the current experiment, neither hot electrons nor fast ions can efficiently deposit their energy and the neutron yield remains low. In future work, we will achieve the higher core density (>10 g/cm^{3}); then hot electrons could contribute more to the core heating via drag heating. Together with hot electrons, the ion contribution to fast ignition is indispensable for realizing high-gain fusion. By virtue of its core heating and ignition, the proposed scheme can potentially achieve high gain fusion.
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Affiliation(s)
- Y Kitagawa
- The Graduate School for the Creation of New Photonics Industries, Kurematsucho, 1955-1 Nishi-ku, Hamamatsu 431-1202 Japan
| | - Y Mori
- The Graduate School for the Creation of New Photonics Industries, Kurematsucho, 1955-1 Nishi-ku, Hamamatsu 431-1202 Japan
| | - O Komeda
- The Graduate School for the Creation of New Photonics Industries, Kurematsucho, 1955-1 Nishi-ku, Hamamatsu 431-1202 Japan
| | - K Ishii
- The Graduate School for the Creation of New Photonics Industries, Kurematsucho, 1955-1 Nishi-ku, Hamamatsu 431-1202 Japan
| | - R Hanayama
- The Graduate School for the Creation of New Photonics Industries, Kurematsucho, 1955-1 Nishi-ku, Hamamatsu 431-1202 Japan
| | - K Fujita
- The Graduate School for the Creation of New Photonics Industries, Kurematsucho, 1955-1 Nishi-ku, Hamamatsu 431-1202 Japan
| | - S Okihara
- The Graduate School for the Creation of New Photonics Industries, Kurematsucho, 1955-1 Nishi-ku, Hamamatsu 431-1202 Japan
| | - T Sekine
- Hamamatsu Photonics, K. K. Kurematsucho, 1820 Nishi-ku, Hamamatsu 431-1202, Japan
| | - N Satoh
- Hamamatsu Photonics, K. K. Kurematsucho, 1820 Nishi-ku, Hamamatsu 431-1202, Japan
| | - T Kurita
- Hamamatsu Photonics, K. K. Kurematsucho, 1820 Nishi-ku, Hamamatsu 431-1202, Japan
| | - M Takagi
- Hamamatsu Photonics, K. K. Kurematsucho, 1820 Nishi-ku, Hamamatsu 431-1202, Japan
| | - T Watari
- Hamamatsu Photonics, K. K. Kurematsucho, 1820 Nishi-ku, Hamamatsu 431-1202, Japan
| | - T Kawashima
- Hamamatsu Photonics, K. K. Kurematsucho, 1820 Nishi-ku, Hamamatsu 431-1202, Japan
| | - H Kan
- Hamamatsu Photonics, K. K. Kurematsucho, 1820 Nishi-ku, Hamamatsu 431-1202, Japan
| | - Y Nishimura
- Toyota Technical Development Corp., 1-21 Imae, Hanamoto-cho, Toyota, Aichi 470-0334, Japan
| | - A Sunahara
- Institute for Laser Technology, 1-8-4 Utsubo-honmachi, Nishi-ku, Osaka 550-0004, Japan
| | - Y Sentoku
- Department of Physics, University of Nevada, Reno 1664 N Virginia Street, Reno, Nevada 89557, USA
| | - N Nakamura
- Advanced Material Engineering Division, TOYOTA Motor Corporation, 1200, Mishuku, Susono, Shizuoka 410-1193, Japan
| | - T Kondo
- Advanced Material Engineering Division, TOYOTA Motor Corporation, 1200, Mishuku, Susono, Shizuoka 410-1193, Japan
| | - M Fujine
- Advanced Material Engineering Division, TOYOTA Motor Corporation, 1200, Mishuku, Susono, Shizuoka 410-1193, Japan
| | - H Azuma
- TOYOTA Central Research and Development Laboratories, Inc., 41-1 Yokomichi, Nagakute-cho, Aichi, Japan
| | - T Motohiro
- TOYOTA Central Research and Development Laboratories, Inc., 41-1 Yokomichi, Nagakute-cho, Aichi, Japan
| | - T Hioki
- TOYOTA Central Research and Development Laboratories, Inc., 41-1 Yokomichi, Nagakute-cho, Aichi, Japan
| | - M Kakeno
- TOYOTA Central Research and Development Laboratories, Inc., 41-1 Yokomichi, Nagakute-cho, Aichi, Japan
| | - E Miura
- National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
| | - Y Arikawa
- Institute of laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565, Japan
| | - T Nagai
- Institute of laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565, Japan
| | - Y Abe
- Institute of laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565, Japan
| | - S Ozaki
- National Institute for Fusion Science, 322-6 Oroshi Toki, Gifu 509-5292, Japan
| | - A Noda
- Advanced Research Center for Beam Science, Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
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Abe Y, Hosoda H, Arikawa Y, Nagai T, Kojima S, Sakata S, Inoue H, Iwasa Y, Iwano K, Yamanoi K, Fujioka S, Nakai M, Sarukura N, Shiraga H, Norimatsu T, Azechi H. Characterizing a fast-response, low-afterglow liquid scintillator for neutron time-of-flight diagnostics in fast ignition experiments. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:11E126. [PMID: 25430305 DOI: 10.1063/1.4896957] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The characteristics of oxygen-enriched liquid scintillators with very low afterglow are investigated and optimized for application to a single-hit neutron spectrometer for fast ignition experiments. It is found that 1,2,4-trimethylbenzene has better characteristics as a liquid scintillator solvent than the conventional solvent, p-xylene. In addition, a benzophenon-doped BBQ liquid scintillator is shown to demonstrate very rapid time response, and therefore has potential for further use in neutron diagnostics with fast time resolution.
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Affiliation(s)
- Y Abe
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - H Hosoda
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Y Arikawa
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - T Nagai
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - S Kojima
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - S Sakata
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - H Inoue
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - Y Iwasa
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - K Iwano
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - K Yamanoi
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - S Fujioka
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - M Nakai
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - N Sarukura
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - H Shiraga
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - T Norimatsu
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
| | - H Azechi
- Institute of Laser Engineering, Osaka University, 2-6 Yamada-oka, Suita, Osaka 565-0871, Japan
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5
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Nagai T, Arikawa Y, Hosoda H, Ioka Y, Hasegawa A, Wada K, Takaoku S, Takata M, Noritake K, Minami Y, Watanabe K, Yamanoi K, Nakamura H, Watari T, Cadatal-Raduban M, Shimizu T, Sarukura N, Nakai M, Norimatsu T, Azechi H. Development of time-of-flight neutron detector with fast-decay and low-afterglow scintillator for fast ignition experiment. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20135913012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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