TITLE

Chaos generated pinch effect in toroidal confinement devices

AUTHOR(S)
Spizzo, G.; White, R. B.; Cappello, S.
PUB. DATE
October 2007
SOURCE
Physics of Plasmas;Oct2007, Vol. 14 Issue 10, p102310
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Particle transport in a toroidal plasma confinement device is shown to be nondiffusive when magnetic chaos is present. A phenomenological fit to density profiles gives a diffusion constant and also a pinch velocity directed up the density gradient. We show that the combination of diffusion and pinch is actually an expression of the nonlocal, subdiffusive nature of the transport. The effect is illustrated by numerical modelling of the magnetic structure and associated particle transport in conditions relevant for the reversed-field pinch experiment at the Consorzio RFX, Padova, Italy [G. Rostagni, Fusion Eng. Des. 25, 301 (1995)]. The relevance of this result is quite general, and could be applied also to other systems with chaos induced particle transport, such as electron transport in the tokamak.
ACCESSION #
27370820

 

Related Articles

  • Electron plasmas: Confinement and mode structure in a small aspect ratio toroidal experiment. Pahari, S.; Ramachandran, H. S.; John, P. I. // Physics of Plasmas;Sep2006, Vol. 13 Issue 9, p092111 

    Toroidal electron plasmas have remained less explored due to their poor confinement properties. Their equilibrium, stability, and confinement properties are therefore not entirely understood and continue to remain a topic of intense ongoing research. Large aspect-ratio theory suggests poor...

  • Characteristics of confinement and stability in large helical device edge plasmas. Komori, A.; Sakakibara, S.; Morisaki, T.; Watanabe, K. Y.; Narushima, Y.; Toi, K.; Ohdachi, S.; Masuzaki, S.; Kobayashi, M.; Shoji, M.; Ohyabu, N.; Ida, K.; Tanaka, K.; Kawahata, K.; Narihara, K.; Morita, S.; Peterson, B. J.; Sakamoto, R.; Yamada, H.; Ikeda, K. // Physics of Plasmas;May2005, Vol. 12 Issue 5, p056122 

    Recent progress in the heating capability in the large helical device [O. Motojima et al., Phys. Plasmas 6, 1843 (1999)] has allowed the highest average β value (4.1%) obtained in the helical devices, and enables exploration of magnetohydrodynamics (MHD) stability in this β region. MHD...

  • General formulation of the resistive wall mode coupling equations. Pustovitov, V. D. // Physics of Plasmas;Jul2008, Vol. 15 Issue 7, p072501 

    A theoretical framework to describe the magnetic coupling of the toroidal plasma with the resistive wall and other sources of the field asymmetry is formulated. This is done for general toroidal geometry without restrictions on the plasma, while the wall is considered as a thin shell....

  • Simulation of the nonlinear evolution of large scale relativistic electron flow in dense plasmas. Matsumoto, Toshikazu; Taguchi, Toshihiro; Mima, Kunioki // Physics of Plasmas;May2006, Vol. 13 Issue 5, p052503 

    A relativistic electron beam of about 100 MA is transported through overdense plasmas in the fast ignition. The nonlinear dynamics of the relativistic electron beam in dense plasmas has been investigated using a two-dimensional fluid-particle hybrid (FPH) code [T. Taguchi et al., Phys. Rev....

  • Particle Modeling of Plasma Confinement by Multipolar Magnetic Fields. Takekida, Hideto; Nanbu, Kenichi // AIP Conference Proceedings;2004, Vol. 708 Issue 1, p172 

    Multipolar magnetic fields are widely used to enhance plasma density. The effect of plasma confinement by multipolar magnetic fields is studied numerically using a self-consistent particle modeling of discharges in a cylinder. © 2004 American Institute of Physics

  • Solar nanoflares and other smaller energy release events as growing drift waves. Vranjes, J.; Poedts, S. // Physics of Plasmas;Sep2009, Vol. 16 Issue 9, p092902 

    Rapid energy releases (RERs) in the solar corona extend over many orders of magnitude, the largest (flares) releasing an energy of 1025 J or more. Other events, with a typical energy that is a billion times less, are called nanoflares. A basic difference between flares and nanoflares is that...

  • Equilibrium, multistability, and chiral asymmetry in rotated mirror plasmas. Valanju, P. M.; Mahajan, S. M.; Quevedo, H. J. // Physics of Plasmas;Jun2006, Vol. 13 Issue 6, p062105 

    The Hall term in two-fluid magnetohydrodynamics is shown to be necessary to balance the curl of the ion inertial force in a rotating plasma with spatially nonuniform crossed electric and magnetic fields. Two-fluid solutions are obtained that qualitatively explain the multistable rotational...

  • Quantum effects on Rayleigh–Taylor instability in a vertical inhomogeneous rotating plasma. Hoshoudy, G. A. // Physics of Plasmas;Feb2009, Vol. 16 Issue 2, pN.PAG 

    Quantum effects on Rayleigh–Taylor instability in inhomogeneous plasma rotating uniformly in an external magnetic field have been investigated. Using the exponential density distribution and in the presence of a fixed boundary condition, the linear growth rate is obtained and analyzed. It...

  • Quantum effects on the Rayleigh–Taylor instability in a horizontal inhomogeneous rotating plasma. Hoshoudy, G. A. // Physics of Plasmas;Jun2009, Vol. 16 Issue 6, p064501 

    The Rayleigh–Taylor instability is studied analytically in inhomogeneous plasma rotating uniformly in an external transverse magnetic field. The influence of the quantum mechanism is considered. For a stratified layer the linear growth rate is obtained. Some special cases that isolate the...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics