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Kiriyama, Hiromitsu
Recent Research Developments in Optics, Vol.3, p.155 - 171, 2003/12
no abstracts in English
Oka, Kiyoshi; Shibanuma, Kiyoshi
JAERI-Tech 2003-004, 57 Pages, 2003/03
JAERI-Tech-2003-004.pdf:2.36MB
Cesium is required in order to generate a stable negative ion of hydrogen in an ion source of the neutral beam injector (NBI), which is one of the plasma-heating devices for International Thermonuclear Experimental Reactor (ITER). After long time operation of NBI, the cesium deposits to the insulators supporting the electrode. Due to the deterioration of the insulation resistance, the continuous operation of the NBI will be difficult. In addition, the NBI device is activated by neutron from D-T plasma, so that a periodic removal and cleaning of the cesium on the insulators by remote handling is required. A study of the cesium removal scenario and device is therefore required considering remote handling. In this report, a cesium removal procedure and conceptual design of the cesium removal device using laser ablation technique are studied, and the feasibility of laser ablation is shown.
Yamaoka, Hiroto*; Tsuchiya, Kazuyuki*; Awano, Toshihiko*; Oka, Kiyoshi
Ishikawajima Harima Giho, 42(5), p.260 - 264, 2002/09
no abstracts in English
O
crystalsKiriyama, Hiromitsu; Nakano, Fumihiko*; Yamakawa, Koichi
Journal of the Optical Society of America B, 19(8), p.1857 - 1864, 2002/08
Times Cited Count：7 Percentile：36.31(Optics)no abstracts in English
Hatae, Takaki; Nakatsuka, Masahiro*; Yoshida, Hidetsugu*; Naito, Osamu; Kitamura, Shigeru; Sakuma, Takeshi*; Hamano, Takashi*; Tsukahara, Yoshimitsu
Proceedings of 29th European Physical Society Conference on Plasma Physics and Controlled Fusion, 4 Pages, 2002/00
no abstracts in English
Oba, Masaki; Maruyama, Yoichiro
JAERI-Research 2001-040, 24 Pages, 2001/08
JAERI-Research-2001-040.pdf:2.35MB
no abstracts in English
Teraoka, Yuden; Yoshigoe, Akitaka
JAERI-Tech 2001-009, 41 Pages, 2001/03
JAERI-Tech-2001-009.pdf:1.99MB
no abstracts in English
O crystals for highy efficient second-harmonic generation of high-power Nd:YAG laserKiriyama, Hiromitsu; Nakano, Fumihiko*; Yamakawa, Koichi
Technical Digest on 4th Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim 2001), p.II_150 - II_151, 2001/00
no abstracts in English
Kiriyama, Hiromitsu; Nakano, Fumihiko*; Yamakawa, Koichi
Shingaku Giho, 100(391), p.37 - 42, 2000/10
no abstracts in English
O crystals for the efficient second-harmonic generation of high power Nd:YAG laserKiriyama, Hiromitsu; Matsuoka, Shinichi; Nakano, Fumihiko*; Yamakawa, Koichi
Optical Review, 7(4), p.281 - 283, 2000/07
Times Cited Count：1 Percentile：10.06(Optics)no abstracts in English
*; Miyamoto, Shuji*; *; *; *; Hasegawa, Makoto; Yamazaki, Yoshio
JNC TY9400 2000-008, 20 Pages, 2000/03
JNC-TY9400-2000-008.pdf:0.81MB
no abstracts in English
*; *
JNC TJ8420 2000-010, 171 Pages, 2000/03
JNC-TJ8420-2000-010.pdf:5.34MB
no abstracts in English
Kiriyama, Hiromitsu; Matsuoka, Shinichi; Maruyama, Yoichiro; Arisawa, Takashi
Optics Communications, 174(5-6), p.499 - 502, 2000/02
Times Cited Count：6 Percentile：34.7(Optics)no abstracts in English
Maruyama, Yoichiro; Kato, Masaaki; Oba, Masaki
JAERI-Tech 98-018, 45 Pages, 1998/06
no abstracts in English
*; Oka, Kiyoshi; Kakudate, Satoshi; Obara, Kenjiro; *; Tada, Eisuke; A.Tesini*; Shibanuma, Kiyoshi; R.Haange*
Proceedings of 17th IEEE/NPSS Symposium Fusion Engineering (SOFE'97), 2, p.921 - 924, 1998/00
no abstracts in English
Maruyama, Yoichiro; Kato, Masaaki; Harayama, Sayaka; Oba, Masaki
JAERI-Tech 97-018, 17 Pages, 1997/03
no abstracts in English
Maruyama, Yoichiro; Oba, Masaki; Kato, Masaaki; Arisawa, Takashi
OSA TOPS on Advanced Solid-State Lasers 1996, 1, p.369 - 372, 1996/00
no abstracts in English
Maruyama, Yoichiro; Kato, Masaaki; Oba, Masaki; Arisawa, Takashi
Japanese Journal of Applied Physics, 34(8B), p.L1045 - L1047, 1995/08
Times Cited Count：3 Percentile：51.46(Physics, Applied)no abstracts in English
Fukui, Yasutaka; ; Tanimoto, Kenichi; Terunuma, Seiichi
PNC TN9410 95-041, 171 Pages, 1994/12
As the material is irradiated by laser beam, its surface is instataneously heated and ablation. the contaminant in surface layer of radioactive wastes will be decontaminated, provided that such the physical phenomenon is used of decontamination technique. The applicability with decommissioning of laser decontamination technique are investigated by the research of the associated laser techniques and the removing test with metal surface. The results of the research and the test is as follows. (1)The research of laser decontamination. On the YAG and the eximer laser beam, there were some study reports of the decontamination, with the metal and the concrete. The structural material. the biological shield, and the waste strage vessel, these objects were regarded as the objects of the laser decontamination. (2)The removing test of the metal surfacc by lascr beam. The removing performance was examined by irradiating line forcused YAG laser beam with the stainless steel surface. The average removal depth rose, in proportion the product of the energy beam density and the number of beam pulse in He atomosphere. The removal depth was obtained more than 1
m, in condition of the laser beam energy was 400mJ and the moving velocity of the test piece was 0.25mm/sec. About 65% of the ablation products were collected, by the simple absorbing system of the open type. (3)Future plan. It is necessary, Examining the removing performance and the variable property of the removal surface, investigating the decontamination technique of the large area and the collecting technique of the ablation products, and so. Thereafter the application to the decontamination will be studied.
