Journal ArticleDOI
Turbulent Fluctuations in TFTR Configurations with Reversed Magnetic Shear.
E. Mazzucato,S. H. Batha,Michael A. Beer,M.G. Bell,R. E. Bell,Robert Budny,C.E. Bush,T.S. Hahm,Gregory W. Hammett,Fred Levinton,Raffi Nazikian,Hyeon K. Park,G. Rewoldt,G. L. Schmidt,E. J. Synakowski,William Tang,G. Taylor,M. C. Zarnstorff +17 more
TLDR
Turbulent fluctuations in plasmas with reversed magnetic shear investigated on the Tokamak Fusion Test Reactor are found to be consistent with the suppression of turbulence by the E x B velocity shear.Abstract:
Turbulent fluctuations in plasmas with reversed magnetic shear have been investigated on the Tokamak Fusion Test Reactor. Under intense auxiliary heating, these plasmas are observed to bifurcate into two states with different transport properties. In the state with better confinement, it has been found that the level of fluctuations is very small throughout most of the region with negative shear. By contrast, the state with lower confinement is characterized by large bursts of fluctuations which suggest a competition between the driving and the suppression of turbulence. These results are consistent with the suppression of turbulence by the $\mathbf{E}\ifmmode\times\else\texttimes\fi{}\mathbf{B}$ velocity shear.read more
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Journal ArticleDOI
Zonal flows in plasma—a review
TL;DR: A comprehensive review of zonal flow phenomena in plasmas is presented in this article, where the focus is on zonal flows generated by drift waves and the back-interaction of ZF on the drift waves, and various feedback loops by which the system regulates and organizes itself.
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
Foundations of nonlinear gyrokinetic theory
Alain J. Brizard,T.S. Hahm +1 more
TL;DR: The nonlinear gyrokinetic equations play a fundamental role in our understanding of the long-time behavior of strongly magnetized plasmas as mentioned in this paper, and they have been used to describe the turbulent evolution of low-frequency electromagnetic fluctuations in a nonuniform magnetization with arbitrary magnetic geometry.
Journal ArticleDOI
Turbulent transport reduction by zonal flows : Massively parallel simulations
TL;DR: Three-dimensional gyrokinetic simulations of microturbulence in magnetically confined toroidal plasmas with massively parallel computers showed that, with linear flow damping, an asymptotic residual flow develops in agreement with analytic calculations.
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.