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Kondo, Yasuhiro; Hirano, Koichiro; Ito, Takashi; Kikuzawa, Nobuhiro; Kitamura, Ryo; Morishita, Takatoshi; Oguri, Hidetomo; Okoshi, Kiyonori; Shinozaki, Shinichi; Shinto, Katsuhiro; et al.
Journal of Physics; Conference Series, 1350, p.012077_1 - 012077_7, 2019/12
Times Cited Count：1 Percentile：51.67(Physics, Particles & Fields)We have upgraded a 3-MeV linac at J-PARC. The ion source is same as the J-PARC linac's, and the old 30-mA RFQ is replaced by a spare 50-mA RFQ, therefore, the beam energy is 3 MeV and the nominal beam current is 50 mA. The main purpose of this system is to test the spare RFQ, but also used for testing of various components required in order to keep the stable operation of the J-PARC accelerator. The accelerator has been already commissioned, and measurement programs have been started. In this paper, present status of this 3-MeV linac is presented.
Kondo, Yasuhiro; Asano, Hiroyuki*; Chishiro, Etsuji; Hirano, Koichiro; Ishiyama, Tatsuya; Ito, Takashi; Kawane, Yusuke; Kikuzawa, Nobuhiro; Meigo, Shinichiro; Miura, Akihiko; et al.
Proceedings of 28th International Linear Accelerator Conference (LINAC 2016) (Internet), p.298 - 300, 2017/05
We have constructed a linac for development of various accelerator components at J-PARC. The ion source is same as the J-PARC linac's, and the RFQ is a used one in the J-PARC linac. The beam energy is 3 MeV and nominal beam current is 30 mA. The accelerator has been already commissioned, and the first development program, laser-charge-exchange experiment for the transmutation experimental facility, has been started. In this paper, present status of this 3-MeV linac is presented.
Hirano, Koichiro; Asano, Hiroyuki; Ishiyama, Tatsuya; Ito, Takashi; Okoshi, Kiyonori; Oguri, Hidetomo; Kondo, Yasuhiro; Kawane, Yusuke; Kikuzawa, Nobuhiro; Sato, Yoshikatsu; et al.
Proceedings of 13th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.310 - 313, 2016/11
We have used a beam scraper with the incident angle of 65deg to reduce the beam power deposition density in the MEBT between a 324 MHz RFQ and a 50-MeV DTL of the J-PARC linac. The 65
scraper was irradiated by the H
beam up to particle number of 1.47E22. We observed a lot of surface projections with several hundred micrometers high in the beam irradiation damage on the scraper by using the laser microscope. In order to study the limits of scrapers, we constructed a new 3 MeV linac at J-PARC. We will conduct the scraper irradiation test at the end of this year.
Nakano, Takafumi; Sato, Fuminori; Shirozu, Hidetomo; Nakanishi, Ryuji; Fukuda, Kazuhito; Tachibana, Ikuya
Nihon Genshiryoku Gakkai-Shi ATOMO
, 57(1), p.14 - 20, 2015/01
no abstracts in English
Kondo, Yasuhiro; Morishita, Takatoshi; Yamazaki, Saishun; Hori, Toshihiko; Sawabe, Yuki; Chishiro, Etsuji; Fukuda, Shimpei; Hasegawa, Kazuo; Hirano, Koichiro; Kikuzawa, Nobuhiro; et al.
Physical Review Special Topics; Accelerators and Beams, 17(12), p.120101_1 - 120101_8, 2014/12
Times Cited Count：6 Percentile：42.59(Physics, Nuclear)We performed a beam test of a new radio frequency quadrupole linac (RFQ III) for the beam current upgrade of the Japan Proton Accelerator Research Complex. First, the conditioning of RFQ III was conducted, and after 20 h of conditioning, RFQ III became very stable with a nominal peak power and duty factor of 400 kW and 1.5%, respectively. An off-line beam test was subsequently conducted before installation in the accelerator tunnel. The transmission, transverse emittance, and energy spread of the 50-mA negative hydrogen beam from RFQ III were measured and compared with simulation results. The experiment and simulation results showed good agreement; therefore, we conclude that the performance of RFQ III conforms to its design.
Oguri, Hidetomo; Hasegawa, Kazuo; Ito, Takashi; Chishiro, Etsuji; Hirano, Koichiro; Morishita, Takatoshi; Shinozaki, Shinichi; Ao, Hiroyuki; Okoshi, Kiyonori; Kondo, Yasuhiro; et al.
Proceedings of 11th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.389 - 393, 2014/10
no abstracts in English
Hori, Toshihiko; Sato, Fumiaki; Shinozaki, Shinichi; Chishiro, Etsuji; Oguri, Hidetomo; Futatsukawa, Kenta*; Fukui, Yuji*
Proceedings of 10th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.1001 - 1003, 2014/06
no abstracts in English
Kondo, Yasuhiro; Morishita, Takatoshi; Hasegawa, Kazuo; Chishiro, Etsuji; Hirano, Koichiro; Hori, Toshihiko; Oguri, Hidetomo; Sato, Fumiaki; Shinozaki, Shinichi; Sugimura, Takashi*; et al.
Physical Review Special Topics; Accelerators and Beams, 16(4), p.040102_1 - 040102_8, 2013/04
Times Cited Count：15 Percentile：68(Physics, Nuclear)We performed a high-power test of a new radio-frequency quadrupole (RFQ II) for the J-PARC linac. RFQ II was developed as a spare RFQ because the operating J-PARC RFQ has suffered from a sparking problem. First, the conditioning of RFQ II was carried out; after 50 h of conditioning, RFQ II became very stable with a nominal power and duty of 330 kW and 3%, respectively. Next the thermal properties were measured because the resonant frequency of RFQ II is tuned by changing the temperature of the cooling water. The frequency response was measured and compared to finite-element method simulation results, confirming that the simple two-dimensional model reproduces the experimental data well. The differences in the field distribution with changes in the rf loading and the cooling-water temperature were also measured, and no serious field distortion was observed. Therefore, we conclude that RFQ II can perform well as a high-power rf cavity.
Kurata, Yuji; Sato, Hidetomo*; Yokota, Hitoshi*; Suzuki, Tetsuya*
Proceedings of 2nd International Workshop on Structural Materials for Innovative Nuclear Systems (SMINS-2), p.177 - 188, 2012/12
Liquid lead-bismuth is a candidate material used for innovative nuclear systems such as accelerator driven reactors and fast reactors. Development of corrosion resistant materials in liquid lead-bismuth is one of important research subjects to realize these systems. In this study, improvement of corrosion properties in lead-bismuth by Al alloy coating was investigated. Aluminum alloys were coated on 316SS using sheets made of Al, Ti and Fe powders, and laser heating. Adjustments of chemical composition in sheets and scanning rate of laser beam enabled us to control Al concentration in coating layers. The corrosion tests were conducted at 550C for 1,000 hours or 3,000 hours in oxygen-controlled lead-bismuth. As a result of the corrosion tests, it was found that the coating with Al concentration of 5 to 8 mass% showed good corrosion resistance.
Kawamura, Masato*; Chishiro, Etsuji; Shinozaki, Shinichi; Fang, Z.*; Fukui, Yuji*; Naito, Fujio*; Yamazaki, Masayoshi*; Tsubota, Naoaki; Futatsukawa, Kenta; Sato, Fumiaki; et al.
Proceedings of 8th Annual Meeting of Particle Accelerator Society of Japan (Internet), 3 Pages, 2011/08
We will report about status of linac 400 MeV upgrade program and northeast Japan earthquake restoration. On March 11, the linac suffered serious damage as consequence of the earthquake, and was shuttled down for long term. Linac RF group restores the facilities and is accomplishing 400 MeV upgrade at the same time.
Kurata, Yuji; Sato, Hidetomo*; Yokota, Hitoshi*; Suzuki, Tetsuya*
Materials Transactions, 52(5), p.1033 - 1040, 2011/05
Times Cited Count：12 Percentile：54.26(Materials Science, Multidisciplinary)A new Al-alloy coating method using Al, Ti and Fe powders has been applied to 316SS in order to develop corrosion resistant coating in lead-bismuth eutectic (LBE). The 316SS plates with coating layers of different Al concentrations were tested at 550C for 1000h in liquid LBE with controlled oxygen concentrations of 10
10
mass%. While surface oxidation and grain boundary corrosion accompanied by LBE penetration are observed in 316SS without Al-alloy coating, the Al-alloy coating is effective to protect such severe corrosion attacks in LBE. Although the coating layer containing 2.8 mass% Al does not always keep sufficient corrosion resistance, good corrosion resistance is obtained in the coating layer where the average Al concentration is 4.2 mass%. Cracks are found in the coating layer containing 17.8 mass% Al. The Al-powder-alloy coating applied to 316SS is promising as a corrosion resistant coating method in liquid LBE environment.
Sato, Hidetomo*; Nakano, Hiromasa*; Yokota, Hitoshi*; Suzuki, Tetsuya*; Maekawa, Katsuhiro*; Kurata, Yuji
no journal, ,
Liquid lead-bismuth is a candidate material used for accelerator driven systems and fast reactors. One of difficulties to apply Pb-Bi to nuclear systems is the corrosiveness of liquid Pb-Bi to structural steels. For this reason the study has been focused on improvement of corrosion resistance due to addition of Si and Al to steels. In this study, type 316 stainless steel was coated by Al-Ti-Fe eutectic alloy layer to enhance corrosion resistance in liquid lead-bismuth. The coating was conducted by a powder eutectic method using laser heating. The optimum condition to produce good coating layers was obtained concerning laser pulse energy and chemical composition of powders.
Sato, Hidetomo*; Nakano, Hiromasa*; Yokota, Hitoshi*; Suzuki, Tetsuya*; Maekawa, Katsuhiro*; Kurata, Yuji
no journal, ,
Liquid lead-bismuth is a candidate material used for accelerator driven systems and fast reactors. One of difficulties to apply Pb-Bi to nuclear systems is the corrosiveness of liquid Pb-Bi to structural steels. Recently, an Al alloy coating technique using Al and Ti powders was developed. In this study, type 316 stainless steel was coated with Al-Ti-Fe alloy layer to enhance corrosion resistance in liquid lead-bismuth. As a result of the corrosion test of the Al alloy coated specimens in liquid lead-bismuth, it was found that the coated layer exhibited good corrosion resistance to lead-bismuth.
Kurata, Yuji; Sato, Hidetomo*; Yokota, Hitoshi*; Suzuki, Tetsuya*
no journal, ,
Liquid lead-bismuth is a candidate material used for accelerator driven systems and fast reactors. Development of corrosion resistant materials in liquid lead-bismuth is one of important research subjects to realize these systems. In this study improvement of corrosion resistance of 316SS was investigated by means of aluminum powder alloy coating. Aluminum alloys were coated on 316SS using sheets made of Al, Ti and Fe powders, and laser heating. The corrosion test was conducted at 550C for 1000h in liquid lead-bismuth where oxygen concentrations were controlled to be about 5
10mass%. As a result of the corrosion test, it was found that Al alloy coating protected grain boundary corrosion and surface oxidation of Fe and Cr, which were significant in 316SS substrate.
Kurata, Yuji; Sato, Hidetomo*; Yokota, Hitoshi*; Suzuki, Tetsuya*
no journal, ,
Liquid lead-bismuth is a candidate material used for accelerator driven systems and fast reactors. Development of corrosion resistant materials in liquid lead-bismuth is one of important research subjects to realize these systems. In this study, effect of Al concentration in coating layer on corrosion properties in lead-bismuth was investigated for the purpose of improvement of corrosion properties of 316SS by an Al powder alloy coating method. Aluminum alloys were coated on 316SS using sheets made of Al, Ti and Fe powders, and laser heating. The corrosion test was conducted at 550C for 3000h in liquid lead-bismuth. The coating with about 2 mass% of Al did not exhibit enough corrosion resistance. Cracks were found in the coating with 13 to 15 mass% of Al. The coating with about 8 mass% of Al showed good corrosion resistance without cracking.
Yokota, Hitoshi*; Sato, Hidetomo*; Suzuki, Tetsuya*; Maekawa, Katsuhiro*; Kurata, Yuji
no journal, ,
Liquid lead-bismuth is a candidate material of a spallation target and a coolant of accelerator driven systems for transmutation of high-level radioactive wastes. Compatibility of steels and lead-bismuth is one of critical issues. In order to solve the problem, Al powder alloy coating on 316SS was investigated. The Al alloy coating was conducted by scanning a YAG laser beam on Al-Ti-Fe sheets under Ar gas environment. Coating parameters are chemical compositions of sheet material, scanning rates of laser beam etc. Cracks often formed in the coating layer when Al contents in sheet material were high. From detail analyses, knowledge of crack formation was obtained in Al powder alloy coating using this method.
Kurata, Yuji; Sato, Hidetomo*; Yokota, Hitoshi*; Suzuki, Tetsuya*
no journal, ,
Liquid lead-bismuth is a candidate material used for accelerator driven systems and fast reactors. Development of corrosion resistant materials in liquid lead-bismuth is one of important research subjects to realize these systems. In this study, improvement of corrosion properties in lead-bismuth by Al alloy coating was investigated. Aluminum alloys were coated on 316SS using sheets made of Al, Ti and Fe powders, and laser heating. Adjustments of chemical composition in sheets and scanning rate of laser beam enabled us to control Al concentration in coating layers. The corrosion test was conducted at 550C for 3000h in oxygen-controlled lead-bismuth. As a result of the corrosion test, it was found that the coating with Al concentration of 5 to 8 mass% showed good corrosion resistance.
Koshino, Katsuhiko; Shirai, Nobutoshi; Sakaguchi, Shinobu; Shirozu, Hidetomo; Otaki, Miyuki*; Kosaka, Ichiro; Nakano, Takafumi; Nagasato, Yoshihiko; Tachibana, Ikuya
no journal, ,
no abstracts in English
Sato, Fuminori; Kataoka, Shoji; Matsushima, Ryotatsu; Otake, Katsumi*; Shirozu, Hidetomo
no journal, ,
no abstracts in English
Sato, Fuminori; Kataoka, Shoji; Matsushima, Ryotatsu; Otake, Katsumi*; Shirozu, Hidetomo
no journal, ,
no abstracts in English
