Refine your search:     
Report No.
 - 
Search Results: Records 1-12 displayed on this page of 12
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

JAEA Reports

Study on impurity radiation and transport of JT-60U plasmas

Ishijima, Tatsuo

JAERI-Research 2000-015, p.94 - 0, 2000/03

JAERI-Research-2000-015.pdf:3.4MB

no abstracts in English

Journal Articles

Spectroscopic study of JT-60U divertor plasma

Kubo, Hirotaka; Higashijima, Satoru; Takenaga, Hidenobu; Kumagai, Akira*; Shimizu, Katsuhiro; Sugie, Tatsuo; Suzuki, Shingo; Sakasai, Akira; Asakura, Nobuyuki

NIFS-PROC-44, p.65 - 68, 2000/01

no abstracts in English

Journal Articles

A Review on impurity transport in divertors

Shimizu, Katsuhiro; Takizuka, Tomonori; Sakasai, Akira

Journal of Nuclear Materials, 241-243, p.167 - 181, 1997/00

 Times Cited Count:55 Percentile:95.21(Materials Science, Multidisciplinary)

no abstracts in English

Journal Articles

Spectroscopic study of impurity bahavior in JT-60U divertor plasma

Kubo, Hirotaka; Sugie, Tatsuo; Shimizu, Katsuhiro; Sakasai, Akira; Higashijima, Satoru; Koide, Yoshihiko; Asakura, Nobuyuki; Shimada, Michiya; JT-60 Team

UV and X-Ray Spectroscopy of Astrophysical and Laboratory Plasmas (Frontiers Science Series No. 15), 0, p.29 - 34, 1996/00

no abstracts in English

JAEA Reports

Neoclassical transport analysis of titanium impurity in plasmas with strongly peaked density profiles

Hirayama, Toshio; Sugie, Tatsuo; Sakasai, Akira; Yoshino, Ryuji;

JAERI-M 91-169, 15 Pages, 1991/10

JAERI-M-91-169.pdf:0.65MB

no abstracts in English

JAEA Reports

Behavior of Radial Electric Field and Inpurity Transport in Tokamak

JAERI-M 8750, 92 Pages, 1980/03

JAERI-M-8750.pdf:2.09MB

no abstracts in English

JAEA Reports

One Dimensional Transport for Tokamak Plasmas,1

;

JAERI-M 8420, 50 Pages, 1979/09

JAERI-M-8420.pdf:1.2MB

no abstracts in English

JAEA Reports

Temperature Gradient Effects on Impurity-Ion Transport

JAERI-M 6965, 24 Pages, 1977/02

JAERI-M-6965.pdf:0.6MB

no abstracts in English

Oral presentation

Introduction of a multi-species collision operator in GT5D and its application to heavy impurity transport

Obrejan, K.; Idomura, Yasuhiro; Honda, Mitsuru*

no journal, , 

To analyze heavy impurity transport, the gyrokinetic full-f Eulerian code GT5D was extended with an implicit collision solver based on a multi-species linear Fokker-Plank collision operator. In the collision solver, a Krylov subspace method is applied to a collision operator, which is given as a convection diffusion operator in velocity space, and severe CFL conditions of heavy impurities are resolved. In addition, flux coordinates are newly applied to resolve magnetic field structures with less grids, and collisional transport simulations are dramatically accelerated. A collisional transport benchmark of tungsten was conducted to verify the accuracy of GT5D.

Oral presentation

Numerical study of the role of higher order flows in neoclassical transport of high-Z impurities

Obrejan, K.; Idomura, Yasuhiro; Honda, Mitsuru*

no journal, , 

The use of tungsten to coat divertors or other plasma facing components, inevitably leads to the pollution of the fusion plasma by heavy and highly charged (high-Z) impurities. This kind of neoclassical and turbulent transport of high-Z impurities is not yet fully understood. To study high-Z impurity transport, the gyrokinetic full-f Eulerian simulation code GT5D was upgraded with an implicit collision solver based on a multi-species linear Fokker-Plank collision operator. The commonly employed low order approximation of the standard neoclassical theory showed good agreement for low-Z impurities, but large differences were observed for high-Z impurities in the presence of temperature gradients. We tested an improved form of the neoclassical transport theory, that takes into account higher order flows to more accurately recover the friction coefficients in a high collisionality regime, showing good agreement with GT5D. An important consequence of this improved method is the weakening of thermal screening effect of bulk ions on impurity transport.

Oral presentation

Influence of the normalised gyroradius on neoclassical transport in global gyrokinetic simulations using the code GT5D

Obrejan, K.; Idomura, Yasuhiro; Honda, Mitsuru*

no journal, , 

The use of tungsten in plasma facing components inevitably leads to the pollution of the fusion plasma by heavy impurities and their accumulation at the core. Although heavy impurity transport has been estimated by the neoclassical transport theory, recent studies exhibited differences between global gyrokinetic simulations and the Hirshman-Sigmar (HS) moment approach, a commonly employed local theory. We performed a thorough benchmark for neoclassical particle transport of various impurities using the newly upgraded multi-species linear Fokker-Plank collision operator of our gyrokinetic full-f Eulerian simulation code GT5D. While good agreement was obtained in the case of flat temperature profiles, the dependence on the temperature gradient was found to be much weaker than the H-S theory in small machine sizes. Good agreement between GT5D and the H-S theory was recovered only for the case of large machine sizes, similar to ITER but beyond that of most current fusion devices.

Oral presentation

Influence of the normalised ion gyroradius on collisional transport of impurities in full-f gyrokinetic simulations

Obrejan, K.; Idomura, Yasuhiro; Honda, Mitsuru*

no journal, , 

The use of tungsten in plasma facing components inevitably leads to the pollution of the fusion plasma by heavy impurities and their accumulation at the core, and this phenomenon is not yet fully understood. In this study, we performed a thorough comparison of the impurity particle fluxes between the global gyrokinetic full-f Eulerian code GT5D and local collisional transport theory called as the Hirshman-Sigmar moment approach. It is found that the simulation and the theory agree only in flat temperature profile cases or in large device sizes comparable to ITER. The cause of their discrepancy at the current device sizes is investigated in detail by comparing flows, which drive collisional impurity transport.

12 (Records 1-12 displayed on this page)
  • 1