TITLE

Perturbed plasma equilibria

AUTHOR(S)
Boozer, Allen H.; Nührenberg, Carolin
PUB. DATE
October 2006
SOURCE
Physics of Plasmas;Oct2006, Vol. 13 Issue 10, p102501
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The force balance, or equilibrium, of an axisymmetric toroidal plasma with a scalar pressure can be relatively simply calculated. However, equilibrium calculations present fundamental difficulties when either the geometry or the plasma forces are more complicated. Many of these issues, such as the loss of magnetic surfaces and complicated plasma forces, can be addressed by perturbation theory using ideal magnetohydrodynamics stability codes. This paper outlines the procedure for carrying out such calculations and demonstrates the method by applying it to a problem with a known solution, an axisymmetric tokamak in which the pressure is increased by 15%.
ACCESSION #
22988371

 

Related Articles

  • Characterization of coherent magnetic fluctuations in JFT-2M high recycling steady high-confinement mode plasmas. Kamiya, K.; Oyama, N.; Ido, T.; Bakhtiari, M. // Physics of Plasmas;Mar2006, Vol. 13 Issue 3, p032507 

    The most important feature of the “high recycling steady” (HRS) high-confinement mode (H-mode) regime in the JFT-2M tokamak [H. Ninomiya et al., Fusion Science and Technology (2002), Vol. 42, p. 7] is the stationary pedestal condition in the absence of the large edge localized modes...

  • Eigenvalue problems for Beltrami fields arising in a three-dimensional toroidal magnetohydrodynamic equilibrium problem. Hudson, S. R.; Hole, M. J.; Dewar, R. L. // Physics of Plasmas;May2007, Vol. 14 Issue 5, p052505 

    A generalized energy principle for finite-pressure, toroidal magnetohydrodynamic (MHD) equilibria in general three-dimensional configurations is proposed. The full set of ideal-MHD constraints is applied only on a discrete set of toroidal magnetic surfaces (invariant tori), which act as barriers...

  • Three-dimensional equilibria and island energy transport due to resonant magnetic perturbation edge localized mode suppression on DIII-D. King, J. D.; Strait, E. J.; Nazikian, R.; Paz-Soldan, C.; Eldon, D.; Fenstermacher, M. E.; Ferraro, N. M.; Hanson, J. M.; Haskey, S. R.; La Haye, R. J.; Lanctot, M. J.; Lazerson, S. A.; Logan, N. C.; Liu, Y. Q.; Okabayashi, M.; Park, J. -K.; Shiraki, D.; Turnbull, A. D. // Physics of Plasmas;215, Vol. 22 Issue 11, p1 

    Experiments in the DIII-D tokamak show that the plasma responds to resonant magnetic perturbations (RMPs) with toroidalmode numbers of n = 2 and n = 3 without field line reconnection, consistent with resistive magnetohydrodynamic predictions, while a strong nonlinear bifurcation is apparent when...

  • Effect of toroidal magnetic field on n = 1 mode stability in rotamak plasmas. Yang, X.; Goss, J.; Kalaria, D.; Huang, T. S. // Physics of Plasmas;Aug2011, Vol. 18 Issue 8, p080708 

    To study the effect of toroidal magnetic field on n = 1 mode stability, a series of experiments with linearly ramping the axial current Iz, which makes field-reversed configuration (FRC) to spherical tokamak (ST) transition, have been conducted in rotamak. Results clearly demonstrate that the...

  • Effect of nonaxisymmetric magnetic perturbations on divertor heat and particle flux profiles in National Spherical Torus Experiment. Ahn, J-W.; Maingi, R.; Canik, J. M.; McLean, A. G.; Lore, J. D.; Park, J.-K.; Soukhanovskii, V. A.; Gray, T. K.; Roquemore, A. L. // Physics of Plasmas;May2011, Vol. 18 Issue 5, p056108 

    Small, nonaxisymmetric magnetic perturbations generated by external coils have been found to break the axisymmetry of heat and particle flux deposition pattern in the divertor area in the National Spherical Torus Experiment (NSTX). This breaking by the applied 3-D field causes strike point...

  • Effect of toroidal rotation on the geodesic acoustic mode in magnetohydrodynamics. Ren, Haijun // Physics of Plasmas;Sep2012, Vol. 19 Issue 9, p094502 

    Theoretical research on the geodesic acoustic mode (GAM) induced by equilibrium toroidal rotation flow in the tokamak plasmas is approached by using ideal magnetohydrodynamic model. The dispersion relation of the GAM is presented by taking into account magnetic field perturbations. It is shown...

  • Reduced-magnetohydrodynamic simulations of toroidally and poloidally localized edge localized modes. Hölzl, M.; Günter, S.; Wenninger, R. P.; Müller, W.-C.; Huysmans, G. T. A.; Lackner, K.; Krebs, I. // Physics of Plasmas;Aug2012, Vol. 19 Issue 8, p082505 

    We use the non-linear reduced-magnetohydrodynamic code JOREK to study edge localized modes (ELMs) in the geometry of the ASDEX Upgrade tokamak. Toroidal mode numbers, poloidal filament sizes, and radial propagation speeds of filaments into the scrape-off layer are in good agreement with...

  • Topology of tokamak plasma equilibria with toroidal current reversal. Rodrigues, Paulo; Bizarro, João P. S. // Physics of Plasmas;Jan2012, Vol. 19 Issue 1, p012504 

    Some general principles about scalar functions with critical points are used to rigorously ascertain that magnetic equilibria with both toroidal current reversal and nested magnetic surfaces are atypical solutions and highly unstable to arbitrary perturbations of boundary conditions and other...

  • Nonlinear drift tearing modes in the presence of a resistive wall and field errors. Finn, John M. // Physics of Plasmas;Oct98, Vol. 5 Issue 10, p3595 

    Examines the nonlinear tearing modes with electron diamagnetism and resistive wall with parallel compression and particle diffusion. Importance of locking magnetic perturbations to a resistive wall in the magnetohydrodynamic activity in tokamaks; Occurrence of locking in the presence of plasma...

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