TITLE

Diamagnetic thresholds for sawtooth cycling in tokamak plasmas

AUTHOR(S)
Halpern, Federico D.; Lütjens, Hinrich; Luciani, Jean-François
PUB. DATE
October 2011
SOURCE
Physics of Plasmas;Oct2011, Vol. 18 Issue 10, p102501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The cycling dynamics of the internal kink mode, which drives sawtooth oscillations in tokamak plasmas, is studied using the three dimensional, non-linear magnetohydrodynamic (MHD) code XTOR-2F [H. Lütjens and J.-F. Luciani, J. Comput. Phys. 229, 8130 (2010)]. It is found that sawtooth cycling, which is characterized by quiescent ramps and fast crashes in the experiment, can be recovered in two-fluid MHD provided that a criterion of diamagnetic stabilization is fulfilled. The simulation results indicate that diamagnetic effects alone may be sufficient to drive sawteeth with complete magnetic reconnection in high temperature Ohmic plasmas.
ACCESSION #
66903314

 

Related Articles

  • Exact solutions for reconnective annihilation in magnetic configurations with three sources. Tassi, E.; Titov, V. S.; Hornig, G. // Physics of Plasmas;Feb2003, Vol. 10 Issue 2, p448 

    Exact solutions of the steady resistive three-dimensional magnetohydrodynamics equations in cylindrical coordinates for an incompressible plasma are presented. The solutions are translationally invariant along one direction and in general they describe a process of reconnective annihilation in a...

  • Electromagnetic global gyrokinetic simulation of shear Alfven wave dynamics in tokamak plasmas. Nishimura, Y.; Lin, Z.; Wang, W. X. // Physics of Plasmas;Apr2007, Vol. 14 Issue 4, p042503 

    Electromagnetic gyrokinetic simulation in toroidal geometry is developed based on a fluid-kinetic hybrid electron model. The Alfven wave propagation in a fully global gyrokinetic particle simulation is investigated. In the long-wavelength magnetohydrodynamic limit, shear Alfven wave...

  • Computer studies on plasmoid dynamics associated with the spontaneous fast reconnection mechanism. Ugai, M. // Physics of Plasmas;Sep95, Vol. 2 Issue 9, p3320 

    Presents computer studies on plasmoid dynamics associated with the spontaneous fast reconnection mechanism. Characteristics of the strong Alfvenic plasma jet; Formation of a slow shock along the backward-half plasmoid boundary; Measurement of propagation speed; Enhancement of the plasma...

  • Double-kink fishbone instability caused by circulating energetic ions. Kolesnichenko, Ya. I.; Lutsenko, V. V.; Marchenko, V. S.; White, R. B. // Physics of Plasmas;May2004, Vol. 11 Issue 5, p1803 

    The destabilization of double kink modes by the circulating energetic ions in tokamaks with the plasma current having an off-axis maximum is studied. It is shown that the high-frequency fishbone instability [energetic particle mode (EPM)] and the low-frequency (diamagnetic) fishbones are...

  • Suppression of m=2 islands by electron cyclotron heating in the Texas Experimental Tokamak: Experiment and theory. Sing, D. C.; Austin, M. E.; Brower, D. L.; Chen, J. Y.; Gandy, R. F.; Yu, C. X.; Wang, X.-H.; Bhattacharjee, A.; Schnack, D. D. // Physics of Fluids B: Plasma Physics;Sep93, Vol. 5 Issue 9, p3239 

    Electron cyclotron heating (ECH) is used to suppress m=2 magnetohydrodynamic (MHD) oscillations in the Texas Experimental Tokamak (TEXT) [Nucl. Technol. Fusion 1, 479 (1981)]. The location of ECH power deposition is controlled by a movable antenna. The MHD activity is suppressed when the ECH...

  • Rotating nonlinear magnetic islands in a tokamak plasma. Smolyakov, A. I.; Hirose, A.; Lazzaro, E.; Re, G.B.; Callen, J.D. // Physics of Plasmas;May95, Vol. 2 Issue 5, p1581 

    Examines the nonlinear dynamics of rotating low-poloidal-mode-number tearing modes in a tokamak with external resonant magnetic perturbations. Derivation of nonlinear evolution equations for the island width and the toroidal rotation frequency within the two-fluid magnetohydrodynamic model;...

  • Control of plasma shape and performance of the PBX-M tokamak experiment in high-βt /high-βp regimes. Bell, R. E.; Asakura, N.; Bernabei, S.; Chance, M. S.; Duperrex, P.-A.; Fonck, R. J.; Gammel, G. M.; Greene, G.; Hatcher, R. E.; Holland, A.; Jardin, S. C.; Jiang, T.-W.; Kaita, R.; Kaye, S. M.; Kessel, C. E.; Kugel, H. W.; LeBlanc, B.; Levinton, F. M.; Okabayashi, M. // Physics of Fluids B: Plasma Physics;Jun90, Vol. 2 Issue 6, p1271 

    The highly indented plasmas of the PBX-M tokamak experiment [Plasma Physics and Controlled Nuclear Fusion Research (IAEA, Vienna, 1989), Vol. 1, p. 97] have reached plasma regimes of both high volume-averaged beta (β[sub t]), and high-beta poloidal (β[sub p]), and show evidence of the...

  • A Lower Hybrid Current Drive system for Alcator C-Mod. Bernabei, S.; Hosea, J. C.; Loesser, D.; Rushinski, J.; Wilson, J. R.; Bonoli, P.; Grimes, M.; Parker, R.; Porkolab, M.; Terry, D.; Woskov, P. // AIP Conference Proceedings;2001, Vol. 595 Issue 1, p237 

    A Lower Hybrid Current Drive system is being constructed jointly by PSFC and PPPL for installation on the Alcator C-Mod tokamak, with the primary goal of driving plasma current in the outer region of the plasma. The LH system consists of 3 MW power at 4.6 GHz with a maximum pulse length of 5...

  • Defining and identifying three-dimensional magnetic reconnection in resistive magnetohydrodynamic simulations of Earth’s magnetosphere. Dorelli, John C.; Bhattacharjee, A. // Physics of Plasmas;May2008, Vol. 15 Issue 5, p056504 

    Magnetic reconnection is thought to be the primary mode by which the solar wind couples to the terrestrial magnetosphere, driving phenomena such as magnetic storms and aurorae. While the theory of two-dimensional reconnection is well developed and has been applied with great success to...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

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

Try another library?
Sign out of this library

Other Topics