Impact of plasma poloidal rotation on resistive wall mode instability in toroidally rotating plasmas

Aiba, N.; Shiraishi, J.; Tokuda, S.
February 2011
Physics of Plasmas;Feb2011, Vol. 18 Issue 2, p022503
Academic Journal
Stability of resistive wall mode (RWM) is investigated in a cylindrical plasma and an axisymmetric toroidal plasma by taking into account not only toroidal rotation but also poloidal rotation. Since the Doppler shifted frequency is responsible for the RWM stability, the modification of this Doppler shifted frequency by poloidal rotation affects the rotation effect on RWM. When a poloidal rotation frequency is not so large, the effect of poloidal rotation on the RWM stability can be approximately treated with the modified toroidal rotation frequency. In a toroidal plasma, this modified frequency is determined by subtracting a toroidal component of the rotation parallel to the magnetic field from the toroidal rotation frequency. The poloidal rotation that counteracts the effect of the Doppler shift strongly reduces the stabilizing effect of toroidal rotation, but by changing the rotational direction, the poloidal rotation enhances this stabilizing effect. This trend is confirmed in not only a cylindrical plasma but also a toroidal plasma. This result indicates that poloidal rotation produces the dependence of the critical toroidal rotation frequency for stabilizing RWM on the rotational direction of toroidal rotation in the same magnetic configuration.


Related Articles

  • Rayleigh–Taylor instability driven nonlinear vortices in dusty plasmas. Veeresha, B. M.; Das, Amita; Sen, Abhijit // Physics of Plasmas;Apr2005, Vol. 12 Issue 4, p044506 

    The low frequency stability of a dusty plasma with a nonuniform mass and charge distribution of the dust component is studied. It is shown that the inverse stratification of the dust mass density in a gravitational field may lead to a Rayleigh–Taylor-like instability. In the nonlinear...

  • The Effects of Combined Parallel Gradient and Collisional Decorrelation in the Absorption of RF Waves. Goode, Brent; Cary, John R.; Berry, L.A. // AIP Conference Proceedings;2003, Vol. 694 Issue 1, p467 

    We examine the effects on RF wave absorption of two different types of particle wave resonance decorrelations. These two mechanisms are collisions and parallel gradients in the magnetic field. A careful treatment of collisions shows that in the integrand for the plasma dispersion function there...

  • Short wavelength ion temperature gradient instability in toroidal plasmas. Gao, Zhe; Sanuki, H.; Itoh, K.; Dong, J. Q. // Physics of Plasmas;Feb2005, Vol. 12 Issue 2, p022502 

    Series of ion temperature gradient (ITG or ηi) driven modes in the short wavelength region, |k⊥ρi|>1, are investigated with a gyrokinetic integral equation code in toroidal plasmas. These instabilities exist even if electrons are assumed adiabatic. However, nonadiabatic electron...

  • Effect of an error field on the stability of the resistive wall mode. Fitzpatrick, Richard // Physics of Plasmas;Feb2007, Vol. 14 Issue 2, p022706 

    A simple model of the resistive wall mode (RWM) in a rotating tokamak plasma subject to a static error field is constructed, and then used to investigate RWM stability in a DIII-D–like [J. L. Luxon, Nucl. Fusion 42, 614 (2002)] plasma. An error field as small as 10 G (i.e., about...

  • Effects of toroidal rotation shear on toroidicity-induced Alfvén eigenmodes in the National Spherical Torus Experiment. Podestà, M.; Bell, R. E.; Fredrickson, E. D.; Gorelenkov, N. N.; LeBlanc, B. P.; Heidbrink, W. W.; Crocker, N. A.; Kubota, S.; Yuh, H. // Physics of Plasmas;Dec2010, Vol. 17 Issue 12, p122501 

    The effects of a sheared toroidal rotation on the dynamics of bursting toroidicity-induced Alfvén eigenmodes are investigated in neutral beam heated plasmas on the National Spherical Torus Experiment (NSTX) [M. Ono et al., Nucl. Fusion 40, 557 (2000)]. The modes have a global character,...

  • Gyroscopic effect in compact toroidal plasmas. Geren, Preston; Steinhauer, Loren // Physics of Plasmas;Jul2004, Vol. 11 Issue 7, p3646 

    The gyroscopic effect in compact toroidal plasmas is investigated using a minimum energy principle in which the angular momentum is added as a constraint. If attention is limited to incompressible plasmas, the flow and field vectors can be expanded in eigenfunctions of the curl (Beltrami...

  • Magnetic field strength of toroidal plasma equilibria. Garren, D. A.; Boozer, A. H. // Physics of Fluids B: Plasma Physics;Oct91, Vol. 3 Issue 10, p2805 

    The confinement and stability properties of toroidal plasma equilibria are largely determined by the strength of the magnetic field expressed in terms of Boozer coordinates. Constraints due to the toroidicity of the configuration and the divergence-free property of the magnetic field limit the...

  • Dynamic property of spontaneous toroidal field in field-reversed configuration plasmas. Shiokawa, A.; Goto, S. // Physics of Fluids B: Plasma Physics;Feb93, Vol. 5 Issue 2, p534 

    The toroidal field in the translated field-reversed configuration (FRC) plasma has been measured, although the FRC plasma has sometimes been described as having only the poloidal field. Measurements of the toroidal field distribution during the plasma translation clarify the location where the...

  • Nonlinear reduced Braginskii equations with ion thermal dynamics in toroidal plasma. Zeiler, A.; Drake, J.F.; Rogers, B. // Physics of Plasmas;Jun97, Vol. 4 Issue 6, p2134 

    Derives a set of nonlinear reduced equations which describe the low frequency dynamics of electron and ion energy and density in a toroidal plasma. Energy integral of the equations; Suitability of the equations for studying the relation between electron and ion thermal transport in low...


Read the Article


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

Try another library?
Sign out of this library

Other Topics