The spectrum of low‐frequency, m= ±1 oscillations in a cold, collisionless, cylindrical plasma comprises the frequencies of the lowest radial eigenmodes and the surface modes of the fast magnetosonic wave, all the global eigenmodes of the Alfven wave (ion‐cyclotron wave), and the Alfven continuum. The spectrum of a homogeneous, currentless plasma cylinder is obtained from an analytical dispersion relation. This spectrum is compared with numerically obtained spectra of nonuniform plasmas with and without axial current. The connection of the magnetohydrodynamic (MHD) kink and internal kink instabilities with the global eigenmodes of the Alfven wave is evidenced. Among all the modes of the magnetosonic wave which have frequencies in the Alfven continuum, the (m= −1, k<0) ‐surface mode is the best candidate for antenna–plasma coupling because its conversion layer is located well into the plasma interior.

/pdf/spectrum-of-low-frequency-nonaxisymmetric-oscillations-in-a-v9vnyluxx0.pdf

Spectrum of low‐frequency, nonaxisymmetric oscillations in a cold, current‐carrying plasma column

The detailed experimental data obtained on the TCA tokamak [Proceedings of the 11th Symposium on Fusion Technology (CEC, Luxembourg, 1981), Vol. I, p. 601] concerning the antenna loading and wave fields as a function of the Alfven wave spectrum are presented. The plasma density, plasma current, working gas, toroidal magnetic field, and frequency were varied systematically and the detailed results are compiled and discussed. In addition the phasing of the antenna currents was varied systematically, thereby exciting different combinations of modes, including pure traveling waves. The conclusions relevant to the design of an antenna system have been stressed.

The Alfvén wave spectrum as measured on a tokamak

Reference CRPP-ARTICLE-1983-008View record in Web of Science Record created on 2008-04-16, modified on 2017-05-12

Geometrical effects on resonant absorption of MHD-waves

By measuring the time evolution of the perturbed magnetic field vectors, the formation of the spatial Alfven resonance layer and cutoff fields has been first observed in an inhomogeneous plasma. A simple MHD theory including the effect of the ion-neutral collision is described as a background to understand the experimental results.

Formation of spatial Alfven resonance and cutoff fields in an inhomogeneous plasma

Reference CRPP-ARTICLE-1985-028doi:10.1103/PhysRevLett.54.1671View record in Web of Science Record created on 2008-04-16, modified on 2017-05-12

/pdf/observations-of-toroidal-coupling-for-low-n-alfven-modes-in-471aq7por8.pdf

Observations of toroidal coupling for low-n Alfvén modes in the TCA tokamak.

Observation of fast current fluctuations during internal disruptions in TCA, by using Alfvén wave diagnostics

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Observation of fast current fluctuations during internal disruptions in TCA, by using Alfvén wave diagnostics