Non-linear coupling to lower-hybrid waves in a tokamak plasma

Theilhaber, K.

doi:10.1088/0029-5515/22/3/005

Cited by 16 publications

(7 citation statements)

References 24 publications

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“…thermal and electromagnetic dispersion are in opposition. This was also noted by Theilhaber [15], who obtained an equation analogous to Eq. ( 6) for a lowdensity, homogeneous, non-linear plasma.…”

supporting

confidence: 64%

Focusing of lower hybrid waves by electromagnetic effects

Hsu

Kuehl

1982

Nucl. Fusion

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The propagation of linear lower hybrid waves in an inhomogeneous plasma is studied under the assumption that the wave field has a relatively narrow spectrum of wave-numbers. The lowest-order electromagnetic correction, neglected in the electrostatic approximation, is included. It is shown that this electromagnetic correction can produce focusing of the wave envelope in the outer layers of typical large-tokamak plasmas. This focusing is a linear effect due to the opposition of thermal and electromagnetic dispersion.

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supporting

confidence: 64%

Focusing of lower hybrid waves by electromagnetic effects

Hsu

Kuehl

1982

Nucl. Fusion

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“…Secondly, non-linear effects in the edge plasma, due to pondermotive forces [9], can modify the plasma dynamics and hence the coupling problem. Much attention has been given to this recently for coupling in the LHRF [10][11][12][13].…”

Section: Summary and Discussionmentioning

confidence: 99%

Three-dimensional theory of waveguide-plasma coupling

Bers

Theilhaber

1983

Nucl. Fusion

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ABSTRACT. A general, linear theory of coupling electromagnetic fields from free-space waveguide arrays to an inhomogeneous plasma in a magnetic field is presented. In contrast to previous analyses, which assumed parallel-plate waveguides, waveguides having closed cross-sections of arbitrary shape are considered; full account is taken of all the waveguide modes. Far away from the coupling region, the plasma is assumed to be absorptive and the waveguides to propagate only their dominant modes. The formulation is geared to obtain the reflection coefficients in the waveguides and the excitation of waves in the plasma. The results are applicable to RF heating of plasmas whose size is large compared to the waveguide array, as would be the case in a fusion reactor, and valid for the frequency regimes of either ion-cyclotron (harmonic), or lower-hybrid, or electron-cyclotron (harmonic) heating.

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“…26,27 These studies focus principally on nondissipative gradient ponderomotive force effects along the Earth's magnetic field, resulting in plasma density changes and mass transport along magnetic field lines of force. Effects of this type were studied for fusion plasma applications by Theilhaber 28 and Petržílka et al 29 In contrast, the present paper explores effects of the ponderomotive force component that is perpendicular to the magnetostatic field. The ponderomotive force in this case arises not from the spatial gradient of the wave amplitude but from dissipation of the poloidal wave momentum.…”

Section: Introductionmentioning

confidence: 99%