Propagation of electromagnetic waves in a planarly stratified, isotropic, warm plasma with a resonance layer

Kamp, Leon Lpj; Weenink, M. P. H.

doi:10.1016/0378-4363(83)90211-5

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…In particular, it has been shown that for the present cold plasma model the total energy absorption takes place in an infinitesimally thin layer around the resonance where the electric field diverges. In a warm plasma the energy absorption (which then consists of partial mode conversion into quasilongitudinal plasma waves) takes place in a layer around the resonance of finite nonzero thickness [Kamp and Weenink, 1983 ;Kamp, 1984 As can be seen from Figure 3 the admittance is zero for co smaller than COve. This is caused by the fact that for co • COve it is not possible anymore to radiate energy into the plasma because there is no propagation of electromagnetic waves possible in that case.…”

Section: Antenna Radiation Admittancementioning

confidence: 99%

Admittance of a cylindrical antenna coated with an inhomogeneous cold plasma sheath with a resonance

Kamp¹,

Weenink²,

Hagebeuk³

1985

Radio Science

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In this paper a perfectly conducting, infinitely long, cylindrical antenna is considered. The antenna is driven by an alternating voltage V applied uniformly around an infinitesimally thin, circumferential gap. Furthermore, the antenna is surrounded by a sheath that goes smoothly over into the surrounding plasma so that the electron density increases smoothly with the distance from the antenna. For this two‐parameter family of electron‐density profiles the admittance of the antenna is calculated for all values of the driving frequency ω > 0 and as a function of the parameters, i.e., of the radius of the antenna and the plasma frequency far away from it. The calculated admittance is further compared with that of the same antenna in vacuum for which Papas' (1949) results have been generalized. It is shown that a measurement of the admittance of the antenna at only one frequency is, in general, not sufficient to determine uniquely the plasma frequency far away from the antenna. At least two measurements at two different frequencies or with two antennas with different radii are necessary to determine uniquely the electron density far away from the antenna.

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Section: Antenna Radiation Admittancementioning

confidence: 99%

Admittance of a cylindrical antenna coated with an inhomogeneous cold plasma sheath with a resonance

Kamp¹,

Weenink²,

Hagebeuk³

1985

Radio Science

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“…Nos observations peuvent donc s'interpreter comme liees a un phenomene d'absorption resonnante (Stenzel et a1 1974) qui correspond a un transfert important d'energie de l'onde electromagnetique aux electrons du plasma par le biais de la composante du champ Clectrique qui est parallele au gradient de densite. en l'occurrence E, (Kamp et Weenink 1983). Comme la densite electronique moyenne augmente avec la puissance absorbee dans le plasma.…”

Section: Distribution Radiale De La Temperature Electronique Et Absor...unclassified

Investigation of a plasma source sustained by an electromagnetic surface wave at 2.45 GHz under free-fall regime

Durandet¹,

Arnal²,

Margot-Chaker³

et al. 1989

J. Phys. D: Appl. Phys.

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The plasma column sustained by an electromagnetic surface wave under the free-fall regime, a still unexplored pressure domain for such a plasma, has been experimentally investigated. Because of the relatively large values of the frequency (2.45 GHz) and plasma diameter (56 mm), the wave propagates either in the dipolar (m=1) or quadrupolar (m=2) mode rather than in the azimuthally symmetric mode (m=0). The radial distributions of the electron density and temperature, obtained by means of electrostatic probes, show the existence of a resonant absorption mechanism of the wave electric field by the electrons. The measured value of the power loss per electron, theta , is found to be four to ten times larger than the value extrapolated from a diffusion model for the m=0 mode. Such a discharge is intended to supply plasma in a reactor operating with a multipolar magnetic confinement used for surface processing.

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“…[29][30][31][32][33][34][35] Most studies have been focused on the direct problem, namely the conversion of electromagnetic waves into Langmuir waves. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] It has been found that in the cold plasma limit, the mode conversion coefficient for the case with a linear or parabolic density profile has a universal dependence on some scaling parameter Q, which is a combination of the wave frequency and the incident angle, with a maximum value of about 0.5. In warm plasmas, it has been claimed that the mode conversion coefficient is approximately unchanged for temperatures up to 100 keV.…”

Section: Introductionmentioning

confidence: 99%

Temperature dependence of mode conversion in warm, unmagnetized plasmas with a linear density profile

Kim

Lee

2013

Physics of Plasmas

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We study theoretically the linear mode conversion between electromagnetic waves and Langmuir waves in warm, stratified, and unmagnetized plasmas, using a numerically precise calculation based on the invariant imbedding method. We verify that the principle of reciprocity for the forward and backward mode conversion coefficients holds precisely regardless of temperature. We also find that the temperature dependence of the mode conversion coefficient is substantially stronger than that previously reported. Depending on the wave frequency and the incident angle, the mode conversion coefficient is found to increase or decrease with the increase of temperature. V C 2013 AIP Publishing LLC. [http://dx.

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Propagation of electromagnetic waves in a planarly stratified, isotropic, warm plasma with a resonance layer

Cited by 9 publications

References 8 publications

Admittance of a cylindrical antenna coated with an inhomogeneous cold plasma sheath with a resonance

Admittance of a cylindrical antenna coated with an inhomogeneous cold plasma sheath with a resonance

Investigation of a plasma source sustained by an electromagnetic surface wave at 2.45 GHz under free-fall regime

Temperature dependence of mode conversion in warm, unmagnetized plasmas with a linear density profile

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