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Ikeda, Makoto; Munakata, Masahiro; Sakai, Ryutaro; Fuchiwaki, Hirotaka; Kimura, Hideo; Matsuba, Hisashi*
Nihon Chikasui Gakkai 2010-Nen Shuki Koenkai Koen Yoshi, p.282 - 287, 2010/11
no abstracts in English
Furuya, Takaaki*; Hara, Kazufumi*; Hosoyama, Kenji*; Kojima, Yuji*; Nakai, Hirotaka*; Nakanishi, Kota*; Sakai, Hiroshi*; Umemori, Kensei*; Sawamura, Masaru; Shinoe, Kenji*
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2923 - 2925, 2010/05
A prototype module including a couple of 1.3 GHz superconducting 9-cell cavities has been designed as the main linac of cERL which is the test facility to establish the basic ERL technology at KEK. The shape of 9-cell Nb structure is optimized to accelerate a CW beam of 100 mA with sufficiently damped higher order modes (HOM) which is achieved by adopting an eccentric fluted beam pipe and a cylindrical beam pipe of a large diameter of 120 mm. Extracted HOMs are absorbed by the ferrite cylinders bonded on the copper beam pipes by HIP process. A power coupler with double disk-ceramics has been developed to transfer an RF of 20 kW CW to the cavity in full reflection. The test results of fabrication, cooling and RF performance for these components are integrated as the prototype module of the main linac for cERL facility.
Sakanaka, Shogo*; Akemoto, Mitsuo*; Aoto, Tomohiro*; Arakawa, Dai*; Asaoka, Seiji*; Enomoto, Atsushi*; Fukuda, Shigeki*; Furukawa, Kazuro*; Furuya, Takaaki*; Haga, Kaiichi*; et al.
Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.2338 - 2340, 2010/05
Future synchrotron light source using a 5-GeV energy recovery linac (ERL) is under proposal by our Japanese collaboration team, and we are conducting R&D efforts for that. We are developing high-brightness DC photocathode guns, two types of cryomodules for both injector and main superconducting (SC) linacs, and 1.3 GHz high CW-power RF sources. We are also constructing the Compact ERL (cERL) for demonstrating the recirculation of low-emittance, high-current beams using above-mentioned critical technologies.
Munakata, Masahiro; Sakai, Ryutaro; Namekawa, Maki; Fuchiwaki, Hirotaka
Proceedings of International Waste Management Symposia 2010 (WM 2010) (Internet), 8 Pages, 2010/03
Japan Atomic Energy Agency has started to investigate a regional groundwater flow system of sedimentary rock in an area in Boso Peninsula of Japan, where the topographic and geological features are relatively simple for mathematical modeling and hydraulic data are available. Groundwater flow on a horizontal 50 km scale is analyzed by using numerical code taking into account climate change. The analytical results for current (today's) steady conditions show that the groundwater flow is mainly from south-eastern area to north-western area in the direction of dip in the stratum. With, precipitation and topographic changes caused by climate change in 80,000 years, future conditions are estimated from existing and observed data. The analyzed results of groundwater flow in future steady conditions show that travel velocities change within a range of 10%. It is indicate that variance of groundwater flow caused by climate changes will be small in this study.
Amemiya, Hiroshi*; Wada, Motoi*; Toyoda, Hirotaka*; Nakamura, Keiji*; Ando, Akira*; Uehara, Kazuya; Oyama, Koichiro*; Sakai, Osamu*; Tachibana, Kunihide*
Purazuma, Kaku Yugo Gakkai-Shi, 81(7), p.482 - 525, 2005/07
This article is asked to write by the Japan Society of Plasma Science and Nuclear Fusion Research. The probe diagnostics in fusion plasma is explaind for many readers of the Journal of Plasma and Fusion Research, who have much concerned on various aspects.In section one, the method to estimate the electron temperature and the density as well as the electron energy distribution function with the single probe is given. In section two, the method to estimate the ion temperature and the flow velocity with the double probe is given. The practical measurements are explained introducing the data obtained at JFT-2, JFT-2a and JFT-2M in JAERI tokamak.
; Sakai, Toshiyuki*; Sanyoshi, Hirotaka; Iwasaki, Isao*; Kuribayashi, Masakazu*;
PNC TN8410 95-056, 65 Pages, 1995/03
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Nemoto, Shinichi; Sakai, Toshiyuki*; Sanyoshi, Hirotaka; Kikuchi, Kenji; Iwasaki, Isao*; Kuribayashi, Masakazu*; Matsushima, Kazumi*
PNC TN8410 93-283, 86 Pages, 1993/11
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Sanyoshi, Hirotaka; Sakai, Toshiyuki*; Kikuchi, Kenji; ; ;
PNC TN8410 93-080, 53 Pages, 1993/03
None
Shinohara, Takenao; Sakai, Kenji; Oi, Motoki*; Kai, Tetsuya; Harada, Masahide; Oikawa, Kenichi; Sato, Hirotaka; Maekawa, Fujio; Aizawa, Kazuya; Arai, Masatoshi; et al.
no journal, ,
no abstracts in English
Shinohara, Takenao; Negishi, Tomoya*; Hayashida, Hirotoshi; Sakai, Kenji; Kai, Tetsuya; Oi, Motoki; Sato, Hirotaka*; Harada, Masahide; Oikawa, Kenichi; Maekawa, Fujio; et al.
no journal, ,
no abstracts in English
Shinohara, Takenao; Sakai, Kenji; Kai, Tetsuya; Hayashida, Hirotoshi; Sato, Hirotaka*; Negishi, Tomoya*; Harada, Masahide; Oi, Motoki; Oikawa, Kenichi; Oku, Takayuki; et al.
no journal, ,
no abstracts in English
Segawa, Mariko; Shinohara, Takenao; Kai, Tetsuya; Iikura, Hiroshi; Oi, Motoki; Oikawa, Kenichi; Harada, Masahide; Sakai, Kenji; Soyama, Kazuhiko; Aizawa, Kazuya; et al.
no journal, ,
Kai, Tetsuya; Harada, Masahide; Oikawa, Kenichi; Sakai, Kenji; Maekawa, Fujio; Oi, Motoki; Shinohara, Takenao; Aizawa, Kazuya; Takata, Shinichi; Arai, Masatoshi; et al.
no journal, ,
Development of imaging techniques with pulse neutrons were started using the NeutrOn Beam-line for Observation and Research Use (NOBORU) of J-PARC at December 2008. The results in the first three months, future research plans and discussions on a new imaging facility in J-PARC are shown.
Shinohara, Takenao; Sakai, Kenji; Kai, Tetsuya; Oi, Motoki; Sato, Hirotaka; Harada, Masahide; Oikawa, Kenichi; Maekawa, Fujio; Aizawa, Kazuya; Arai, Masatoshi; et al.
no journal, ,
no abstracts in English
Shinohara, Takenao; Kai, Tetsuya; Segawa, Mariko; Oi, Motoki; Oikawa, Kenichi; Harada, Masahide; Nakatani, Takeshi; Sakai, Kenji; Iikura, Hiroshi; Aizawa, Kazuya; et al.
no journal, ,
no abstracts in English
Munakata, Masahiro; Fuchiwaki, Hirotaka; Sakai, Ryutaro; Hanatani, Ikuo; Kimura, Hideo
no journal, ,
A long-term groundwater flow for reginal area of sedimentary rock was studied in order to develop the safety assessment code for groundwater flow. The area (40
50 km) consists of sandstone and mudstone with the monoclinal structure of their layers. The hydraulic data of the stratum was used from existing surveys and literatures. In addition, taking account of the geomorphic changes in long-term evaluation, uplift and erosion data in this area was adopted in the analysis. Analytical results show that the groundwater flow velocity after 100,000 years is increased by 5% in the 500 m depth of the center of the domain because of increasing hydraulic gradient caused by the geomorphic changes.
Kimura, Hideo; Munakata, Masahiro; Hanatani, Ikuo; Sakai, Ryutaro; Fuchiwaki, Hirotaka; Matsuba, Hisashi
no journal, ,
no abstracts in English
Shinohara, Takenao; Takata, Shinichi; Aizawa, Kazuya; Suzuki, Junichi; Kai, Tetsuya; Harada, Masahide; Oikawa, Kenichi; Maekawa, Fujio; Sakai, Kenji; Oi, Motoki; et al.
no journal, ,
no abstracts in English
Shinohara, Takenao; Kai, Tetsuya; Oi, Motoki; Harada, Masahide; Sakai, Kenji; Oikawa, Kenichi; Sato, Hirotaka; Maekawa, Fujio; Aizawa, Kazuya; Arai, Masatoshi; et al.
no journal, ,
no abstracts in English
