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Theoretical investigation of toroidal fast wave modes at twice the ion cyclotron frequency

Kwon, Y.S.

United States: Univ. of Texas,Austin, TX 1976

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  • Título:
    Theoretical investigation of toroidal fast wave modes at twice the ion cyclotron frequency
  • Autor: Kwon, Y.S.
  • Assuntos: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY ; 700108 - Fusion Energy- Plasma Research- Wave Phenomena ; ANISOTROPY ; ANTENNAS ; BOUNDARY CONDITIONS ; CYCLOTRON FREQUENCY ; DISPERSION RELATIONS ; ELECTRICAL EQUIPMENT ; ELECTROMAGNETIC RADIATION ; ENERGY-LEVEL TRANSITIONS ; EXCITATION ; PLASMA ; RADIATIONS
  • Descrição: The technique for calculating the excitation coefficient for a half-turn loop antenna in cylindrical and toroidal geometries filled with anisotropic, dissipative medium is presented. Mode orthogonality relations in a cavity are first developed for a dissipative medium and used to calculate the excitation coefficient in a toroidal cavity partially filled with plasma. With aid of the excitation coefficient, the antenna impedance and wall losses are also calculated in both a cylindrical waveguide and a toroidal cavity. A toroidal cavity with multiple antennas is considered as one way of dealing with mode resolvability problem for fusion plasmas. Even though the axial mode spacing can be directly controlled by increasing the number of antennas, the radial mode spacing with respect to the cavity resonance width is very narrow and hence we must move to higher harmonics in order to resolve cavity resonance modes in fusion plasmas. The analytical results for the toroidal cavity are numerically examined with the ST and PLT tokamak parameters for a quasi-toroidal model with electron inertia and temperature effects included. The numerical results (m = 0, +-1 waves) with the PLT tokamak parameters reveals that the total loading resistance spectrum for the cavity resonance modes is severely overlapped. The loading resistance spectrum is thoroughly examined as a function of plasma density in the range from 1.3 up to 1.5 x 10/sup 19/ m/sup -3/ to show how the spacing broadens as the number of antennas increases.
  • Editor: United States: Univ. of Texas,Austin, TX
  • Data de criação/publicação: 1976
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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