TITLE

Rotational stabilization of resistive wall modes in ITER advanced tokamak scenarios

AUTHOR(S)
Zheng, L. J.; Kotschenreuther, M. T.; Van Dam, J. W.
PUB. DATE
May 2010
SOURCE
Physics of Plasmas;May2010, Vol. 17 Issue 5, p056104
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Rotational stabilization of n=1 resistive wall modes in ITER advanced scenarios [K. Ikeda, Nucl. Fusion 47 (2007)] is investigated, where n is the toroidal mode number. In particular, we present numerical results for the ITER strongly reversed shear case, in comparison to the weakly reversed shear case. The rotation frequency is assumed to be modestly low. Our investigation employs the adaptive eigenfunction independent solution-kinetic (AEGIS-K) code [L. J. Zheng et al., “AEGIS-K code for linear kinetic analysis of toroidally axisymmetric plasma stability,” J. Comput. Phys. (to be published)], which provides a fully kinetic (nonhybrid) and self-consistent (nonperturbative) description. AEGIS-K includes wave-particle resonances, shear Alfvén continuum damping, trapped particle effects, and parallel electric effects, but not finite Larmor radius effects. In the case without rotation and kinetic effects included, we find that the strongly reversed shear configuration is more favorable for perfectly conducting wall stabilization of resistive wall modes, in that it has a higher conducting wall beta limit than the weakly reversed shear case. With sufficient rotation, the strongly reversed shear case can also achieve a higher beta limit for completely suppressing the resistive wall modes. However, the marginal rotation frequency required for complete resistive wall mode stabilization in the strongly reversed shear case is about twice as high as that required for the weakly reversed shear case.
ACCESSION #
51059882

 

Related Articles

  • Resistive ferromagnetic wall modes in theory and experiment. Pustovitov, V. D. // Physics of Plasmas;May2009, Vol. 16 Issue 5, p052503 

    Effects of the ferromagnetic resistive wall on the plasma stability are analyzed. The analysis is based on the equations describing the perturbation dynamics outside the plasma, assuming a linear plasma response. A single-mode cylindrical model is used with two features that differ from the...

  • The Hall instability of unsteady inhomogeneous axially symmetric magnetized plasmas. Shtemler, Yuri M.; Mond, Michael; Liverts, Edward // Physics of Plasmas;Nov2004, Vol. 11 Issue 11, p5265 

    The Hall instability in cylindrically symmetric resistive magnetized plasmas in vacuum is investigated. The unperturbed self-similar equilibrium solutions for imploding Z-pinches with time-dependent total current It∼tS,S>1/3, are subjected by short-wave sausage perturbations. The...

  • Two-stream stability for a focusing charged particle beam. Genoni, T. C.; Rose, D. V.; Welch, D. R.; Lee, E. P. // Physics of Plasmas;Nov2004, Vol. 11 Issue 11, pL73 

    The growth of the two-stream instability in one-dimensonal (1D) spherical geometry is analyzed using Laplace and Fourier transforms. An analytic expression for the asymptotic growth is obtained and compared to the well-known planar formula. Stronger linear growth is predicted for a converging...

  • MHD Limits in the T-15M Tokamak. Medvedev, S.Yu.; Pustovitov, V.D. // Plasma Physics Reports;Dec2003, Vol. 29 Issue 12, p1009 

    The problem of plasma MHD stability in the T-15M tokamak is considered in realistic geometry. Stability of the external kink modes with the toroidal wavenumbers n = 1, 2, and 3 is numerically investigated in equilibrium configurations similar to the systematically analyzed steady-state...

  • Suppression of the Magnetic Surface Shift by Plasma Rotation in a Tokamak. Il�gisonis, V. I.; Pozdnyakov, Yu. I. // JETP Letters;4/25/2000, Vol. 71 Issue 8, p314 

    The equilibrium of a toroidally rotating plasma in an axisymmetric tokamak-like system is considered. The equilibrium equation is represented in the form of the Grad�Shafranov equation in which, in contrast to the static case (with no plasma rotation), the plasma pressure depends on both...

  • Nonlinear stability limit in high β tokamaks. Kleva, Robert G.; Guzdar, Parvez N. // Physics of Plasmas;Apr2000, Vol. 7 Issue 4 

    Linearly unstable high β tokamak equilibria are shown to be nonlinearly stabilized by an axisymmetric flow containing both toroidal and poloidal components. As fingers of hot plasma produced by pressure driven ballooning instabilities start to convect out towards the bounding wall, an...

  • Stability of elongated cross-section tokamaks to axisymmetric even poloidal mode number deformations. Weiner, R.; Jardin, S. C.; Pomphrey, N. // Physics of Fluids B: Plasma Physics;Dec89, Vol. 1 Issue 12, p2349 

    In a recent paper, Nakayama, Sato, and Matsuoka [Phys. Fluids 31, 630 (1988)] suggested that elliptical cross-section tokamaks with aspect ratio R/a=3.2 and with elongation κ=2.6 are unstable to a splitting (m=2, n=0) instability for plasma β>5%, and that κ≥4.0 plasmas are...

  • Effects of cross-sectional elongation on the resistive edge modes. Anderson, J.; Nordman, H.; Weiland, J. // Physics of Plasmas;Jan2001, Vol. 8 Issue 1, p180 

    Resistive edge modes in a shifted noncircular tokamak geometry are investigated in the electrostatic limit. The reduced Braghinskii equations are used as a model for the electrons and an advanced fluid model for the ions. An eigenvalue problem is derived from these equations which is solved...

  • Tearing mode stability studies near ideal stability boundaries in DIII-D. Brennan, D. P.; Strait, E. J.; Turnbull, A. D.; Chu, M. S.; La Haye, R. J.; Luce, T. C.; Taylor, T. S.; Kruger, S.; Pletzer, A. // Physics of Plasmas;Jul2002, Vol. 9 Issue 7, p2998 

    For high β, highly shaped plasmas in the DIII-D tokamak [J. L. Luxon and L. G. Davis, Fusion Technol. 8, 441 (1985)], the value of the tearing stability index Δ' calculated at a rational surface can be especially sensitive to the pressure and current profiles. Near marginal stability for...

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