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Journal Articles

Integrated tokamak modelling with the fast-ion Fokker-Planck solver adapted for transient analyses

Toma, Mitsunori; Hamamatsu, Kiyotaka; Hayashi, Nobuhiko; Honda, Mitsuru; Ide, Shunsuke

Plasma Physics and Controlled Fusion, 57(9), p.095007_1 - 095007_9, 2015/09

 Times Cited Count:2 Percentile:82.1(Physics, Fluids & Plasmas)

Integrated tokamak modelling that enables the simulation of an entire discharge periodis indispensable for designing advanced tokamak plasmas. For this purpose, we extend the integrated code TOPICS to make it more suitable for transient analyses in the fast-ion part. The fast-ion Fokker-Planck solver is integrated into TOPICS at the same level as the bulk transport solver so that the time evolutions of the fast ion and the bulk plasma are consistent with each other as well as with the equilibrium magnetic field. The integrated code is applied to ramp-up simulations for JT-60SA and ITER to confirm its capability and effectiveness in transient analyses. In the integrated simulations, the coupled evolution of the fast ions, plasma profiles, and equilibrium magnetic fields are presented.

Journal Articles

Advance in integrated modelling towards prediction and control of JT-60SA plasmas

Hayashi, Nobuhiko; Honda, Mitsuru; Shiraishi, Junya; Miyata, Yoshiaki; Wakatsuki, Takuma; Hoshino, Kazuo; Toma, Mitsunori; Suzuki, Takahiro; Urano, Hajime; Shimizu, Katsuhiro; et al.

Europhysics Conference Abstracts (Internet), 39E, p.P5.145_1 - P5.145_4, 2015/06

Journal Articles

In-vessel tritium

Ueda, Yoshio*; Oya, Kaoru*; Ashikawa, Naoko*; Ito, Atsushi*; Ono, Tadayoshi*; Kato, Daiji*; Kawashima, Hisato; Kawamura, Gakushi*; Kenmotsu, Takahiro*; Saito, Seiki*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 88(9), p.484 - 502, 2012/09

no abstracts in English

Journal Articles

Inward pinch of high-Z impurity in a rotating tokamak plasma; Effects of atomic processes, radial electric field and Coulomb collisions

Hoshino, Kazuo; Toma, Mitsunori*; Shimizu, Katsuhiro; Nakano, Tomohide; Hatayama, Akiyoshi*; Takizuka, Tomonori

Nuclear Fusion, 51(8), p.083027_1 - 083027_6, 2011/08

 Times Cited Count:4 Percentile:73.97(Physics, Fluids & Plasmas)

Journal Articles

Inward pinch of high-Z impurity due to atomic processes in a rotating tokamak plasma and the effect of radial electric field

Hoshino, Kazuo; Toma, Mitsunori*; Shimizu, Katsuhiro; Nakano, Tomohide; Hatayama, Akiyoshi*; Takizuka, Tomonori

Proceedings of 23rd IAEA Fusion Energy Conference (FEC 2010) (CD-ROM), 6 Pages, 2011/03

The transport of high-Z impurity in a toroidally rotating tokamak plasma is investigated analytically and numerically. It is shown that the inward pinch is driven by the atomic processes in co- and ctr- rotating plasmas. This inward pinch is enhanced by the radial electric field. It is derived that the negative and positive radial electric fields cause the inward pinch and the outward movement (unpinch) of the high-Z impurity, respectively, under the influence of Coulomb collisions with the rotating background plasma. In the ctr-rotation case, the inward pinch becomes significant with increasing toroidal rotation velocity, because the directions of the both pinches are inward. On the other hand, in the co-rotation case, these pinches have opposite directions. Therefore, the unpinch due to the positive radial electric field is decreased by the inward pinch due to the atomic processes. These tendencies are consistent with the tungsten accumulation observed in the JT-60U.

Journal Articles

Integrated simulation approaches

Hoshino, Kazuo; Toma, Mitsunori*; Kawamura, Gakushi*; Saito, Seiki*; Ito, Atsushi*

Purazuma, Kaku Yugo Gakkai-Shi, 86(12), p.698 - 705, 2010/12

no abstracts in English

Journal Articles

Impurity transport simulation in SOL/divertor plasma

Toma, Mitsunori*; Hoshino, Kazuo; Kawamura, Gakushi*

Purazuma, Kaku Yugo Gakkai-Shi, 86(12), p.685 - 689, 2010/12

no abstracts in English

Journal Articles

SOL/divertor plasma simulation

Hoshino, Kazuo; Toma, Mitsunori*

Purazuma, Kaku Yugo Gakkai-Shi, 86(12), p.681 - 684, 2010/12

no abstracts in English

Journal Articles

Tritium science and technology for fusion reactor, 3; Theory and code development for evaluation of tritium retention and exhaust in fusion reactor

Oya, Kaoru*; Inai, Kensuke*; Shimizu, Katsuhiro; Takizuka, Tomonori; Kawashima, Hisato; Hoshino, Kazuo; Hatayama, Akiyoshi*; Toma, Mitsunori*; Tomita, Yukihiro*; Kawamura, Gakushi*; et al.

Purazuma, Kaku Yugo Gakkai-Shi, 85(10), p.695 - 703, 2009/10

no abstracts in English

Journal Articles

Numerical analysis of incident angle of heavy metal impurity to plasma facing components by IMPGYRO

Hoshino, Kazuo; Toma, Mitsunori*; Furubayashi, Masahiko*; Hatayama, Akiyoshi*; Inai, Kensuke*; Oya, Kaoru*

Journal of Nuclear Materials, 390-391, p.168 - 171, 2009/06

 Times Cited Count:3 Percentile:69.9(Materials Science, Multidisciplinary)

The self-sputtering yield and the reflection yield are important for a prediction of the tungsten impurity content penetrating into the main plasma in future fusion reactors. These yields greatly depend on the incident angle of impurities to the plasma facing components. The IMPGYRO code is applied to the analysis of the angle distribution of incident impurities and the effect of the incident angle and energy on the sputtering and reflection yields. The incident angle distribution is divided into several peaks corresponding to charge states. This is caused by the different acceleration for each charge state by the sheath. In the attached plasma case, the sheath increases the self-sputtering yield. This is due to the change of the incident angle by the sheath rather than the change of the incident energy. On the other hand, in the detached plasma case, the significant effects of the sheath on the sputtering yield and the reflection yield is not seen.

Oral presentation

Numerical analysis of deposition distribution of tungsten in JT-60U with IMPGYRO code

Hoshino, Kazuo; Toma, Mitsunori*; Hatayama, Akiyoshi*; Shimizu, Katsuhiro; Takizuka, Tomonori; Ueda, Yoshio*; Nakano, Tomohide; Asakura, Nobuyuki

no journal, , 

In order to investigate transport processes of tungsten, tungsten coated tiles were installed in the outer divertor of JT-60U. The poloidal and toroidal distribution of tungsten deposition have been investigated after the experiment campaign. However the transport processes of tungsten have not been clear. In this study, the IMPGYRO code is applied to the analysis of transport process of tungsten to understand the mechanism of tungsten deposition in JT-60U. On the outer doom wing, tungsten directly reaches from the tungsten tile as a neutral due to the low plasma temperature in the private region. The deposition is also observed at the inner divertor due to the transport along the magnetic line of force in the private region.

Oral presentation

Pinch of high-Z impurity in toroidal rotating tokamak plasmas

Hoshino, Kazuo; Toma, Mitsunori*; Shimizu, Katsuhiro; Nakano, Tomohide; Hatayama, Akiyoshi*; Takizuka, Tomonori

no journal, , 

no abstracts in English

Oral presentation

Numerical analysis of tungsten erosion at the plasma facing surface in DEMO reactor

Hoshino, Kazuo; Toma, Mitsunori*; Shimizu, Katsuhiro; Asakura, Nobuyuki; Tobita, Kenji; Hatayama, Akiyoshi*; Takizuka, Tomonori*

no journal, , 

Oral presentation

Integrated modeling of high-energy particle transport in tokamak

Toma, Mitsunori; Hamamatsu, Kiyotaka; Hayashi, Nobuhiko; Honda, Mitsuru; Ide, Shunsuke

no journal, , 

no abstracts in English

Oral presentation

Fokker-Planck modeling for energetic particles at tokamak ramp-up phases

Toma, Mitsunori; Hamamatsu, Kiyotaka; Hayashi, Nobuhiko; Honda, Mitsuru; Ide, Shunsuke

no journal, , 

no abstracts in English

Oral presentation

Distortion of the distribution function of fast ion in the evolving equilibrium and its effect on the heating power and the driven current in tokamaks

Toma, Mitsunori; Hamamatsu, Kiyotaka; Hayashi, Nobuhiko; Honda, Mitsuru; Ide, Shunsuke

no journal, , 

no abstracts in English

Oral presentation

Integrated simulation with the fast ion Fokker-Planck modeling consitent with the evolving equilibrium in tokamaks

Toma, Mitsunori; Hamamatsu, Kiyotaka; Hayashi, Nobuhiko; Honda, Mitsuru; Ide, Shunsuke

no journal, , 

no abstracts in English

Oral presentation

Status of the ITER plasma modeling activities in JAEA

Shiraishi, Junya; Honda, Mitsuru; Hayashi, Nobuhiko; Aiba, Nobuyuki; Toma, Mitsunori; Matsuyama, Akinobu; Naito, Osamu; Miyata, Yoshiaki; Inoue, Shizuo; Narita, Emi; et al.

no journal, , 

no abstracts in English

Oral presentation

Impact of kinetic effects of energetic particles on resistive wall mode stability in rotating high-$$beta$$ plasmas

Shiraishi, Junya; Miyato, Naoaki; Matsunaga, Go; Toma, Mitsunori; Honda, Mitsuru; Suzuki, Takahiro; Yoshida, Maiko; Hayashi, Nobuhiko; Ide, Shunsuke

no journal, , 

no abstracts in English

19 (Records 1-19 displayed on this page)
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