Journal ArticleDOI
Model of the H-mode in tokamaks
Sanae Inoue Itoh,Kimitaka Itoh +1 more
Reads0
Chats0
TLDR
A theoretical model of the H-mode in tokamaks is presented in this article, which is based on the bifurcation of the radial electric field at the plasma edge.Abstract:
The paper presents a theoretical model of the H-mode in tokamaks which is based on the bifurcation of the radial electric field at the plasma edge. The electric field is determined by the balance of the non-ambipolar fluxes of ions and electrons at the edge. It is found that bifurcations of the radial electric field, the particle flux and the convective energy loss occur when the edge gradient reaches a critical value. This is attributed to L-H or H-L transition. The critical conditions are examined and the role of neutral particles as well as the effect of impurities are incorporated in the model. Combining the confinement scaling laws for both the core plasma and the scrape-off layer plasma, the threshold power for the transition is derived. The temporal evolution associated with the transition is studied.read more
Citations
More filters
Journal ArticleDOI
Chapter 2: Plasma confinement and transport
E. J. Doyle,Wayne A Houlberg,Yutaka Kamada,V. S. Mukhovatov,T.H. Osborne,A. R. Polevoi,G. Bateman,J. W. Connor,J. G. Cordey,T. Fujita,Xavier Garbet,T. S. Hahm,L. D. Horton,A. E. Hubbard,F. Imbeaux,Frank Jenko,J. E. Kinsey,Yasuaki Kishimoto,J.X. Li,T. C. Luce,Y. R. Martin,M. Ossipenko,V.V. Parail,A. G. Peeters,T. L. Rhodes,J. E. Rice,C. M. Roach,V. A. Rozhansky,F. Ryter,G. Saibene,R. Sartori,A. C. C. Sips,J. A. Snipes,M. Sugihara,E. J. Synakowski,H. Takenaga,Tomonori Takizuka,K. Thomsen,M. R. Wade,H. R. Wilson,Itpa Confinement Database,Itpa Pedestal +41 more
TL;DR: The understanding and predictive capability of transport physics and plasma confinement is reviewed from the perspective of achieving reactor-scale burning plasmas in the ITER tokamak, for both core and edge plasma regions.
Journal ArticleDOI
The role of the electric field in confinement
Kimitaka Itoh,Sanae I. Itoh +1 more
TL;DR: Theories of the electric field effect on toroidal plasma confinement are reviewed in this paper with the emphasis placed on recent progress in the areas of anomalous transport, structural formation and bifurcation, research which has been motivated by the discovery of improved confinement.
Journal ArticleDOI
A review of theories of the L-H transition
J. W. Connor,H. R. Wilson +1 more
TL;DR: In this paper, a review of the various theories of the L-H transition available in the literature is presented, providing some background information on each theory and expressing the transition criteria in forms suitable for comparison with experiment.
Journal ArticleDOI
Beyond paradigm: Turbulence, transport, and the origin of the radial electric field in low to high confinement mode transitions in the DIII-D tokamak
R.A. Moyer,Keith H. Burrell,T. N. Carlstrom,Stefano Coda,Robert W. Conn,E. J. Doyle,P. Gohil,R. J. Groebner,J. Kim,R. Lehmer,W. A. Peebles,Miklos Porkolab,Curtis L. Rettig,T. L. Rhodes,R. P. Seraydarian,R. E. Stockdale,Daniel Thomas,George Tynan,J.G. Watkins +18 more
TL;DR: In this paper, the authors compared the predictions of the shear suppression of turbulence as the mechanism for the low to high confinement mode (L to H) transition by quantitative comparison with experimental results from the DIII-D tokamak.
Journal ArticleDOI
An emerging understanding of H-mode discharges in tokamaks
TL;DR: In this paper, a remarkable degree of consistency of experimental results from tokamaks throughout the world has developed with regard to the phenomenology of the transition from L • mode to H • mode confinement in tokak.
References
More filters
Journal Article
Plasma Physics and Controlled Nuclear Fusion Research
TL;DR: In this paper, the first experiments in JET have been described, which show that this large tokamak behaves in a similar manner to smaller tokak, but with correspondingly improved plasma parameters.
Journal ArticleDOI
Regime of Improved Confinement and High Beta in Neutral-Beam-Heated Divertor Discharges of the ASDEX Tokamak
TL;DR: In this article, a new operational regime has been observed in neutral-injection-heated ASDEX divertor discharges, characterized by high aspect ratio values comparable to the aspect ratio of Ohmic discharges.
Journal ArticleDOI
Model of L- to H-mode transition in tokamak.
Sanae Inoue Itoh,Kimitaka Itoh +1 more
TL;DR: A "cusp-type catastrophe" among the radial electric field, particle flux, and edge gradients is found at the transition of tokamak plasmas, indicating a critical edge condition for the transition.
Journal ArticleDOI
Neoclassical ion transport in rotating axisymmetric plasmas
F. L. Hinton,S. K. Wong +1 more
TL;DR: In this paper, a drift kinetic equation is derived for rotating axisymmetric plasmas, where the radial gradient of the toroidal angular velocity appears as a driving term like the temperature gradient.
Related Papers (5)
Bifurcation theory of poloidal rotation in tokamaks: A model for L-H transition.
Ker-Chung Shaing,E.C. Crume +1 more