# Transport bifurcation induced by sheared toroidal flow in tokamak plasmas

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We analyze the turbulence driven particle transport in Texas Helimak [K. W. Gentle and H. He, Plasma Sci. Technol. 10, 284 (2008)], a toroidal plasma device with a one-dimensional equilibrium with magnetic curvature and shear. Alterations on the radial electric field, through an external voltage...

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The nonlocal physics associated with turbulent transport is investigated using global gyrokinetic simulations with realistic parameters in shaped tokamak plasmas. This study focuses on the turbulence spreading through a transport barrier characterized by an equilibrium EÃ—B shear layer. It is...

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The transport of injected beam ions due to toroidal magnetic field ripple in the mega-ampÃ¨re spherical tokamak (MAST) is quantified using a full orbit particle tracking code, with collisional slowing-down and pitch-angle scattering by electrons and bulk ions taken into account. It is shown...

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The turbulent EÃ—B advection of energetic ions in three-dimensional tokamak geometry is investigated both analytically and numerically. It is shown that orbit averaging (leading to a significant reduction of the diffusivity) is only valid for low magnetic shear. At moderate or high magnetic...

- On the nature of radial transport across sheared zonal flows in electrostatic ion-temperature-gradient gyrokinetic tokamak plasma turbulence. Sánchez, R.; Newman, D. E.; Leboeuf, J.-N.; Carreras, B. A.; Decyk, V. K. // Physics of Plasmas;May2009, Vol. 16 Issue 5, p055905
It is argued that the usual understanding of the suppression of radial turbulent transport across a sheared zonal flow based on a reduction in effective transport coefficients is, by itself, incomplete. By means of toroidal gyrokinetic simulations of electrostatic, ion-temperature-gradient...

- The rise of fully turbulent flow. Barkley, Dwight; Song, Baofang; Mukund, Vasudevan; Lemoult, Grégoire; Avila, Marc; Hof, Björn // Nature;10/22/2015, Vol. 526 Issue 7574, p550
Over a century of research into the origin of turbulence in wall-bounded shear flows has resulted in a puzzling picture in which turbulence appears in a variety of different states competing with laminar background flow. At moderate flow speeds, turbulence is confined to localized patches; it is...

- Radially global gyrokinetic simulation studies of transport barriers. Parker, S. E.; Mynick, H. E.; Artun, M.; Cummings, J. C.; Decyk, V.; Kepner, J. V.; Lee, W. W.; Tang, W. M. // Physics of Plasmas;May96, Vol. 3 Issue 5, p1959
Studies effects that are linearly stabilizing and may cause the formation of tokamak transport barriers. Improvements in tokamak transport obtained in a variety of operational modes; Sheared toroidal rotation; Reversed magnetic shear; Peaked density profiles; Effect of toroidal shear flow on...

- On the nature of turbulence in a problem on the motion of a fluid behind a ledge. Evstigneev, N.; Magnitskii, N.; Sidorov, S. // Differential Equations;Jan2009, Vol. 45 Issue 1, p68
In the present paper, we suggest a numerical method for the analysis of the motion of a viscous incompressible fluid under the transition to the turbulent mode for an example of the numerical solution of a three-dimensional space problem on the fluid flow behind a ledge for various values of the...

- The statistical evolution of a stratified mixing layer with horizontal shear invoking feature extraction. Arobone, Eric; Sarkar, Sutanu // Physics of Fluids;Nov2010, Vol. 22 Issue 11, p115108
Direct numerical simulations of a horizontally oriented shear layer are performed with various values of uniform vertical stratification. The effects of stratification on statistics such as turbulent Reynolds stress, turbulent kinetic energy, and viscous dissipation are examined. Comparisons...