TITLE

Existence of weakly damped kinetic Alfvén eigenmodes in reversed shear tokamak plasmas

AUTHOR(S)
Gorelenkov, N. N.
PUB. DATE
November 2008
SOURCE
Physics of Plasmas;11/1/2008, Vol. 15 Issue 11, p110701
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A kinetic theory of weakly damped Alfvén eigenmode solutions strongly interacting with the continuum is developed for tokamak plasmas with reversed magnetic shear. It is shown that finite Larmor radius (FLR) effects are required for global eigenmode solutions. FLR effects induce multiple kinetic subeigenmodes and collisionless radiative damping. The theory explains the existence of experimentally observed Alfvénic instabilities with frequencies sweeping down and reaching their minimum (bottom).
ACCESSION #
35541220

 

Related Articles

  • Collisionless kinetic-fluid simulation of zonal flows in non-circular tokamaks. Yamagishi, Osamu; Sugama, Hideo // Physics of Plasmas;Sep2012, Vol. 19 Issue 9, p092504 

    Fluid simulation of linear zonal flow damping is done with a closure model based on the collisionless gyrokinetics [Sugama et al., Phys. Plasmas 14, 022502 (2007)]. Simulation results of residual zonal flow for low radial wavenumbers are compared with theoretical formulas for circular and...

  • Kinetic theory of dust ion acoustic waves in a kappa-distributed plasma. Baluku, T. K.; Hellberg, M. A. // Physics of Plasmas;Aug2015, Vol. 22 Issue 8, p1 

    Using a kinetic theory approach, dust ion acoustic (DIA) waves are investigated in an unmagnetized collisionless plasma with kappa-distributed electrons and ions, and Maxwellian dust grains of constant charge. Both analytical and numerical results, the latter following from the full solution of...

  • Electrostatic modes in dense dusty plasmas with high fugacity: Numerical results. Rao, N. N. // Physics of Plasmas;Aug2000, Vol. 7 Issue 8 

    Investigates the existence of ultra low-frequency wave modes in dusty plasmas with high fugacity. Fluid equations governing dust collective dynamics; Evaluation of wave damping rates; Use of kinetic theories to predict absence of dust-Coulomb waves.

  • Second-order radio frequency kinetic theory with applications to flow drive and heating in tokamak plasmas. Jaeger, E. F.; Berry, L. A.; Batchelor, D. B. // Physics of Plasmas;Feb2000, Vol. 7 Issue 2 

    A comprehensive kinetic theory is developed to treat radio frequency (rf) driven plasma flow in one-dimensional geometry. The kinetic equation is expanded to second order in the perturbing rf electric field. No assumption is made regarding the smallness of the ion Larmor radius relative to...

  • Resistive ballooning modes in an axisymmetric toroidal plasma with long mean free path. Connor, J. W.; Chen, Liu // Physics of Fluids (00319171);Jul85, Vol. 28 Issue 7, p2201 

    Tokamak devices normally operate at such high temperatures that the resistive fluid description is inappropriate. In particular, the collision frequency may be low enough for trapped particles to exist. However, on account of the high conductivity of such plasmas, one can identify two separate...

  • Kinetic theory of quasi-stationary collisionless axisymmetric plasmas in the presence of strong rotation phenomena. Cremaschini, Claudio; Stuchlík, Zdeneˇk; Tessarotto, Massimo // Physics of Plasmas;May2013, Vol. 20 Issue 5, p052905 

    The problem of formulating a kinetic treatment for quasi-stationary collisionless plasmas in axisymmetric systems subject to the possibly independent presence of local strong velocity-shear and supersonic rotation velocities is posed. The theory is developed in the framework of the...

  • Nonlinear frequency shift of electrostatic waves in general collisionless plasma: Unifying theory of fluid and kinetic nonlinearities. Chang Liu; Dodin, Ilya Y. // Physics of Plasmas;Aug2015, Vol. 22 Issue 8, p1 

    The nonlinear frequency shift is derived in a transparent asymptotic form for intense Langmuir waves in general collisionless plasma. The formula describes both fluid and kinetic effects simultaneously. The fluid nonlinearity is expressed, for the first time, through the plasma dielectric...

  • A two-fluid study of oblique tearing modes in a force-free current sheet. Akçay, Cihan; Daughton, William; Lukin, Vyacheslav S.; Yi-Hsin Liu // Physics of Plasmas;2016, Vol. 23 Issue 1, p1 

    Kinetic simulations have demonstrated that three-dimensional reconnection in collisionless regimes proceeds through the formation and interaction of magnetic flux ropes, which are generated due to the growth of tearing instabilities at multiple resonance surfaces. Since kinetic simulations are...

  • On the quasi-linear diffusion in collisionless plasmas (to say nothing about Landau damping). Hellinger, Petr; Trávnícˇek, Pavel M. // Physics of Plasmas;Jun2012, Vol. 19 Issue 6, p062307 

    General quasi-linear diffusion coefficients for nonrelativistic collisionless plasmas are derived for unstable modes and analytically continued to damped modes. Properties of the resulting diffusion are investigated and discussed.

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