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Tani, Keiji; Tobita, Kenji; Iio, Shunji*; Tsutsui, Hiroaki*; Nishio, Satoshi; Aoki, Takayuki*
Denki Gakkai Rombunshi, A, 125(11), p.938 - 942, 2005/11
Studies on the loss of fusion produced alpha particles enhanced by toroidal field (TF) ripple in a low-aspect-ratio tokamak reactor (VECTOR) have been made by using an orbit-following Monte-Carlo code. The ripple loss is strongly reduced as the aspect ratio becomes low. Consequently, alpha particles are well confined in VECTOR. Thanks to the good confinement of alphas in a low-aspect-ratio system, the number of TF coils can be reduced to about 6, one half of the original VECTOR, by installing cooling systems near the outer edge of plasma and making allowances for about 30% increase in the bore diameter of TF coils.
Song, Y.*; Nishio, Satoshi
Fusion Engineering and Design, 72(4), p.345 - 362, 2005/01
Times Cited Count:6 Percentile:40.41(Nuclear Science & Technology)This paper presents detailed optimization results and design windows for the engineering design of normal conducting (NC) center post based on the analysis of thermal-hydraulic, static stress and critical buckling. At the same time a method to reduce the stress in the center post have been proposed, which can be applied to enhance the possibility of normal conducting center post in the future power plants. When the method of improvement for reducing the stress is applied in the system of the center post, the maximum magnet field can be improved from 8.6T to 15T.
Sakurai, Shinji; Tobita, Kenji; Nishio, Satoshi
Purazuma, Kaku Yugo Gakkai-Shi, 80(11), p.955 - 958, 2004/11
no abstracts in English
Yamauchi, Michinori*; Nishitani, Takeo; Nishio, Satoshi
Purazuma, Kaku Yugo Gakkai-Shi, 80(11), p.952 - 954, 2004/11
Considering the geometrical characteristics of tokamak reactors with low aspect ratio, a basic neutronics strategy was derived to construct the inboard structure mainly for neutron shielding and produce enough tritium in the outboard blanket. The designs for optimal inboard shield were surveyed and necessary thickness was estimated to make the neutron flux low enough on the super-conducting magnet. In addition, the outer blanket designs were studied to attain the tritium breeding ratio (TBR) large enough for a self-sustaining fusion reactor on the basis of the advanced fusion reactor materials.
Tobita, Kenji; Nishio, Satoshi; Konishi, Satoshi*; Jitsukawa, Shiro
Journal of Nuclear Materials, 329-333(Part2), p.1610 - 1614, 2004/08
Times Cited Count:12 Percentile:61.44(Materials Science, Multidisciplinary)no abstracts in English
Tani, Keiji; Tobita, Kenji; Nishio, Satoshi; Iio, Shunji*; Tsutsui, Hiroaki*; Aoki, Takayuki*
Denki Gakkai Purazuma Kenkyukai Shiryo (PST-03-39), p.13 - 18, 2003/09
Studies were made on ripple losses of fusion produced alpha particles in a tokamak reactor with a non-circular plasma cross-section by using an orbit-following Monte-Carlo code. A preliminary estimation of ripple loss of alpha particles in VECTOR, a compact tokamak type fusion reactor, with a negative magnetic shear was also made
Sengoku, Seio
Denki Gakkai Purazuma Kenkyukai Shiryo (PST-03-41), p.23 - 26, 2003/09
no abstracts in English
Song, Y.; Nishio, Satoshi
Proceedings of 20th IEEE/NPSS Symposium on Fusion Engineering (SOFE 2003), p.581 - 584, 2003/00
no abstracts in English