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Takei, Hayanori
Isotope News, (779), p.11 - 15, 2022/02
The Japan Atomic Energy Agency (JAEA) has designed a Transmutation Physics Experimental Facility (TEF-P) as an experimental facility in the Japan Proton Accelerator Research Complex (J-PARC). The TEF-P is a critical assembly driven by a low-power proton beam, a maximum of 10 W, which is extracted from a high-power beam source, such as 250 kW of 400 MeV proton beam of the J-PARC Linac. To extract such a low-power proton beam from the high-power proton beam, we developed a laser charge exchange (LCE) device and employed its technique, which is one of the non-contact beam extraction techniques. For the proof of performance of the LCE device to the TEF-P, a low-power proton beam was extracted using a negative-hydrogen Linac having an energy of 3 MeV, and a bright laser. This paper summarizes the experimental results.
Harada, Hiroyuki; Saha, P. K.; Yamane, Isao*; Kato, Shinichi; Kinsho, Michikazu; Irie, Yoshiro*
Proceedings of 13th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.983 - 986, 2016/11
The high-intensity proton accelerator adopts a charge exchange injection scheme, which injects with exchanging from negative Hydrogen ion to proton by using carbon foil. This scheme can realize high intensity proton beam but the uncontrolled beam losses are caused by scattering between beams and the foil. Additionally, the collision may occur the foil beak. Therefore, a new injection scheme for higher intensity is needed as an alternative to the foil. In the J-PARC 3GeV RCS, we newly propose and develop a laser stripping injection scheme However, it is necessary that laser power is two order higher than latest laser one. To realize this big issue, we develop the laser storage ring, which can provide laser pulse of high repetition rate by recycling one. In this presentation, we will introduce the laser stripping injection scheme and describe the concept of the laser storage ring with high repetition rate.
Nishimori, Nobuyuki; Hajima, Ryoichi; Nagai, Ryoji; Minehara, Eisuke
Nuclear Instruments and Methods in Physics Research A, 475(1-3), p.266 - 269, 2001/12
Times Cited Count：15 Percentile：70.48(Instruments & Instrumentation)no abstracts in English
Daido, Hiroyuki; Yamakawa, Koichi; Yamagiwa, Mitsuru; Arisawa, Takashi; Kato, Yoshiaki; Noda, Akira*; Uesaka, Mitsuru*; Ogata, Atsushi*; Matsukado, Koji*
Proceedings of 4th Symposium on Accelerator and Related Technology for Application, p.111 - 112, 2001/10
no abstracts in English
Nishimori, Nobuyuki; Hajima, Ryoichi; Nagai, Ryoji
Proceedings of 25th Linear Accelerator Meeting in Japan, p.374 - 376, 2000/07
no abstracts in English
Nishimori, Nobuyuki; Nagai, Ryoji; Hajima, Ryoichi; Shizuma, Toshiyuki; Minehara, Eisuke
Proceedings of 25th Linear Accelerator Meeting in Japan, p.50 - 52, 2000/07
no abstracts in English
Nishimori, Nobuyuki; Nagai, Ryoji; Hajima, Ryoichi; Shizuma, Toshiyuki; Sawamura, Masaru; Kikuzawa, Nobuhiro; Minehara, Eisuke
Nuclear Instruments and Methods in Physics Research A, 445(1-3), p.432 - 436, 2000/05
Times Cited Count：9 Percentile：53.34(Instruments & Instrumentation)no abstracts in English
Koshizuka, Seiichi*
JNC TJ9400 2000-011, 102 Pages, 2000/03
JNC-TJ9400-2000-011.pdf:2.71MB
In order to evaluate the possibility to achieve high electric power by a fast reactor with supercritical light water, the design study was carried out on a large fast reactor core with high coolant outlet temperature (SCFR-H). Since the reactor coolant circuit uses once-through direct cycle where all feedwater flows through the core to the turbine at supercritical pressure, it is possible to design much simpler and more compact reactor systems and to achieve higher thermal efficiency than those of current light water reactors. The once-through direct cycle system is employed in current fossil-fired power plants. In the present study, three types of core were designed. The first is SCFR-H with blankets cooled by ascending flow, the second is SCFR-H with blankets cooled by descending flow and the third is SCFR-H with high thermal power. Every core was designed to achieve the thermal efficiency over 43%, positive coolant density reactivity coefficient and electric power over 1600MW. Core characteristics of SCFR-Hs were compared with those of SCLWR-H (electric power: 1212MW), which is a thermal neutron spectrum reactor cooled and moderated by supercritical light water, with the same diameter of the reactor pressure vessel. It was shown that SCFR-H could increase the electric power about l.7 times maximally. From the standpoint of the increase of a reactor thermal power, a fast reactor has advantages as compared with a thermal neutron reactor, because it can increase the power density by adopting tight fuel lattices and eliminating the moderator region. Thus, it was concluded that a reactor cooled by supercritical light water could further improve the cost competitiveness by using a fast neutron spectrum and achieving a higher thermal power.
Sawamura, Masaru; Nagai, Ryoji; Kikuzawa, Nobuhiro; Sugimoto, Masayoshi; Nishimori, Nobuyuki; Minehara, Eisuke
Review of Scientific Instruments, 70(10), p.3865 - 3868, 1999/00
Times Cited Count：4 Percentile：38.09(Instruments & Instrumentation)no abstracts in English
Moribayashi, Kengo; Sasaki, Akira; Tajima, Toshiki*
Physical Review A, 58(3), p.2007 - 2015, 1998/09
no abstracts in English
Takuma, Hiroshi
Proceedings of 1st International Conference on Superstrong Fields in Plasmas, p.509 - 515, 1997/00
no abstracts in English
Yamauchi, Toshihiko; ; ;
Purazuma, Kaku Yugo Gakkai-Shi, 72(7), p.692 - 705, 1996/00
no abstracts in English
Okada, Sohei; Kaneko, Hirohisa; Sunaga, Hiromi; Takizawa, Haruki; Yotsumoto, Keiichi
Proc. of the 1994 Int. Linac Conf., Vol. 2, 0, p.570 - 572, 1994/00
no abstracts in English
Ninomiya, Hiromasa; JT-60 Team
15th IEEE/NPSS Symp. on Fusion Engineering,Vol. 2, 0, p.779 - 787, 1993/00
no abstracts in English
Wang, Y.
PNC TN9410 92-039, 26 Pages, 1992/02
A test CW electron linac is designed to develop a high power accelerator to treat waste radioactive material. The linac is to be operated at the room temperature and is energized by two 1.2MW CW L-band klystrons to produce an electron beam with the energy of 10MeV and current of 100mA. The average beam power is 200KW-1MW for the duty factor 20%-100%. In designing such high power electron linear accelerator, an accelerating section having a traveling wave resonant ring is adopted. By adopting such type of acceleration section, it became possible to choose very short length of the accelerator sections to elevate the threshold current of beam break-up (BBU) keeping the high accelerator efficiency. In designing the linac with the traveling wave resonant ring, some special considerations and calculations are introduced. The variational method is used to calculate the sizes and parameters of the disk-loaded accelerator structure. There is the discrepancy of the order of a few hundredth of one percent between the calculated frequency and the experimental one. A kind of internal cooling water structure is adopted to disperse the generated heat by RF efficiently. Currently, its components development is in progress at OEC.
Maebara, Sunao; ; Tsuneoka, Masaki; Sakamoto, Keishi; Ikeda, Yoshitaka; ; ; Nagashima, Takashi
JAERI-M 90-132, 14 Pages, 1990/08
no abstracts in English
Okada, Sohei; Sunaga, Hiromi
Proc. of the 15th Linear Accelerator Meeting in Japan, p.266 - 269, 1990/00
no abstracts in English
; ; Ohara, Yoshihiro;
JAERI-M 9852, 41 Pages, 1981/12
no abstracts in English
Ohara, Yoshihiro
JAERI-M 8357, 89 Pages, 1979/07
no abstracts in English
