Journal ArticleDOI
Enhanced confinement and stability in DIII-D discharges with reversed magnetic shear.
E. J. Strait,L. L. Lao,Michael E. Mauel,B. W. Rice,T. S. Taylor,Keith H. Burrell,Ming-Sheng Chu,E. A. Lazarus,T.H. Osborne,S. J. Thompson,A. D. Turnbull +10 more
TLDR
Values of normalized beta, up to 4 ({percent}-{ital m}-T/MA), energy confinement are a factor of 3 better than {ital L} mode, and at least 50% of the noninductive plasma current in this regime demonstrates compatibility with requirements for a steady-state high-beta tokamak power plant.Abstract:
Peaked pressure profiles and central ion temperatures up to 20 keV are observed in DIII-D $H$-mode discharges with a central region of strongly reversed magnetic shear. Short wavelength ballooning modes are stabilized by access to the second stable regime, longer wavelength modes by a conducting wall and possibly by rotational shear. Values of normalized beta, ${\ensuremath{\beta}}_{N}=\frac{\ensuremath{\beta}\mathrm{aB}}{I}$, up to 4 (%-$m$-T/MA), energy confinement are a factor of 3 better than $L$ mode, and at least 50% of the noninductive plasma current in this regime demonstrates compatibility with requirements for a steady-state high-beta tokamak power plant.read more
Citations
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Journal ArticleDOI
Effects of E×B velocity shear and magnetic shear on turbulence and transport in magnetic confinement devices
TL;DR: The ExB shear stabilization model was originally developed to explain the transport barrier formed at the plasma edge in tokamaks after the L (low) to H (high) transition as mentioned in this paper.
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
A review of internal transport barrier physics for steady-state operation of tokamaks
J. W. Connor,T. Fukuda,Xavier Garbet,C. Gormezano,V. S. Mukhovatov,Masahiro Wakatani,Internal Barrier Physics +6 more
TL;DR: In this paper, the current state of theoretical and experimental knowledge regarding the formation and characteristics of internal transport barriers (ITBs) in tokamaks is reviewed and the experimental situation regarding the steady-state, or at least quasi-steady state, operation of tokak discharges is reviewed.
Journal ArticleDOI
A review of zonal flow experiments
TL;DR: A review of zonal flow experiments is presented in this article, with a brief presentation of the current state of the art, diagnostics and data processing techniques for turbulence and zonal flows and the peripheral issues of ZFL physics.
Journal ArticleDOI
Internal transport barriers in tokamak plasmas
TL;DR: In this article, internal transport barriers in tokamak plasmas are explored in order to improve confinement and stability beyond the reference scenario, used for the ITER extrapolation, and to achieve higher bootstrap current fractions as an essential part of non-inductive current drive.