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Ogawa, Hiroaki; Sugie, Tatsuo; Kasai, Satoshi*; Katsunuma, Atsushi*; Hara, Hirotsugu*; Takeyama, Norihide*; Kusama, Yoshinori
Fusion Engineering and Design, 83(10-12), p.1405 - 1409, 2008/12
Times Cited Count：16 Percentile：68.02(Nuclear Science & Technology)no abstracts in English
Kurosaki, Yukio*; Yamachi, Hiroshi*; Katsunuma, Yoshio*; Nakata, Masao*; Kuwahara, Hideki*; Yamada, Fumitaka*; Matsushita, Kiyoshi*; Sato, Toshinori*
JAEA-Research 2008-048, 274 Pages, 2008/03
JAEA-Research-2008-048.pdf:10.93MB
A junction space between a super deep shaft and horizontal drifts forms a 3-dimensional geo-structure, which would take a complicated mechanical behavior during a junction excavation. However, a quantitative design method for a deep junction has not yet established. In order to examine a collapse mechanism of super deep shaft junction, we have conducted literature surveys and interview studies concerned with a collapses. Considering the results of investigations with reviews of intellectuals, the collapse mechanism depends on both a construction procedure of shaft junction and a geological condition. On the other hand, where a deep junction intersects faults and/or fractures with a large angle, a collapse called taka-nuke may occur and a numerical studies that can simulate a practical rock mass behavior around a shaft junction should be carry out. We demonstrate finite difference method is most adequate for these simulations with intellectual review.
Kajita, Shin; Hatae, Takaki; Katsunuma, Atsushi*; Kusama, Yoshinori
JAEA-Technology 2007-064, 60 Pages, 2008/01
JAEA-Technology-2007-064.pdf:5.65MB
The design of the collection optics for edge Thomson scattering diagnostics for ITER is provided. Since the neutron and 
ray radiation fluxes generated by the nuclear fusion reaction are considerably high near the plasma in ITER, available optical components are limited. Near the plasma, namely in the front-end optics, only metal mirrors can be used; moreover, optical fiber may be used only outside the vacuum window, which is located far from the front-end optics. In this design, three metal mirrors are used for the front-end optics, and the light ray is transmitted in the slender port plug through a relay optical system. To compensate the aberrations and increase the coupling efficiency to the fibers, two types of optical system with Catadioptric system are proposed for fiber-coupling optical system. It has been revealed that refraction type and reflection type system are not adequate for the fiber-coupling optical system. The image qualities are discussed based on the spot diagram and so on for the Catadioptric optical system.
Ogawa, Hiroaki; Sugie, Tatsuo; Kasai, Satoshi; Katsunuma, Atsushi*; Hara, Hirotsugu*; Kusama, Yoshinori
Plasma and Fusion Research (Internet), 2, p.S1054_1 - S1054_4, 2007/11
no abstracts in English
Hatae, Takaki; Nakatsuka, Masahiro*; Yoshida, Hidetsugu*; Ebisawa, Katsuyuki*; Kusama, Yoshinori; Sato, Kazuyoshi; Katsunuma, Atsushi*; Kubomura, Hiroyuki*; Shinobu, Katsuya*
Fusion Science and Technology, 51(2T), p.58 - 61, 2007/02
Times Cited Count：6 Percentile：41.32(Nuclear Science & Technology)no abstracts in English
Ogawa, Hiroaki; Sugie, Tatsuo; Katsunuma, Atsushi*; Kasai, Satoshi
JAEA-Technology 2006-015, 119 Pages, 2006/03
JAEA-Technology-2006-015.pdf:7.26MB
no abstracts in English
Hatae, Takaki; Nakatsuka, Masahiro*; Yoshida, Hidetsugu*; Ebisawa, Katsuyuki*; Katsunuma, Atsushi*; Kusama, Yoshinori
no journal, ,
no abstracts in English
Ogawa, Hiroaki; Sugie, Tatsuo; Kasai, Satoshi; Katsunuma, Atsushi*; Hara, Hirotsugu*
no journal, ,
no abstracts in English
Iwamae, Atsushi; Ogawa, Hiroaki; Sugie, Tatsuo; Kusama, Yoshinori; Kasai, Satoshi*; Katsunuma, Atsushi*; Takeyama, Norihide*
no journal, ,
We report the performance test of the trial optics of the Impurity Influx Monitor (Divertor) for ITER. The emission from the divertor plasma in UV and visible wavelength region will be collected with the head optics and the Cassegrain telescope. The focused light from the plasma is transmitted by the optical fiber to the spectrometers. Since the head optics is irradiated by the high fluxes of the -ray, neutron and high energy particles from the core plasma, we use molybdenum and aluminum metallic mirrors in the head optics. These mirrors are mounted in a module equipped with cooling channels to remove the nuclear heat. We have built metallic mirrors, a Cassegrain telescope, a micro-lens array and optical fiber light distributors for the optical performance test on an ITER-equivalent geometric scale. We expand the field of view along the magnetic field direction with introducing the micro-lens array in front of the fiber core. The light collection efficiency increased by three times at maximum with the micro-lens array. We have evaluated the line-of-sight integrated intensity of the impurity emission line in the divertor plasma with the collisional-radiative model. The estimated intensity of C IV line (581 nm) will be detectable in several lines of sight with the present designed optical system.
Ogawa, Hiroaki; Sugie, Tatsuo; Katsunuma, Atsushi*; Kasai, Satoshi
no journal, ,
no abstracts in English
Ogawa, Hiroaki; Kitazawa, Sin-iti; Sugie, Tatsuo; Katsunuma, Atsushi*; Kitazawa, Daisuke*; Omori, Keisuke*; Itami, Kiyoshi
no journal, ,
no abstracts in English
Ogawa, Hiroaki; Sugie, Tatsuo; Kasai, Satoshi*; Katsunuma, Atsushi*; Hara, Hirotsugu*; Takeyama, Norihide*; Kusama, Yoshinori
no journal, ,
no abstracts in English
Ogawa, Hiroaki; Sugie, Tatsuo; Kasai, Satoshi*; Katsunuma, Atsushi*; Hara, Hirotsugu*; Takeyama, Norihide*
no journal, ,
no abstracts in English
Sugie, Tatsuo; Takeuchi, Masaki; Ishikawa, Masao; Shimada, Takahiko; Katsunuma, Atsushi*; Kitazawa, Daisuke*; Omori, Keisuke*; Itami, Kiyoshi
no journal, ,
no abstracts in English
Ogawa, Hiroaki; Sugie, Tatsuo; Katsunuma, Atsushi*; Kasai, Satoshi
no journal, ,
no abstracts in English
Ogawa, Hiroaki; Iwamae, Atsushi; Sugie, Tatsuo; Kasai, Satoshi*; Katsunuma, Atsushi*; Hara, Hirotsugu*; Takeyama, Norihide*; Kusama, Yoshinori
no journal, ,
no abstracts in English
