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Oversized co-axial and cylindrical surface-wave oscillators with two-dimensional periodical grating (quasi-optical model)
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10.1063/1.4794008
/content/aip/journal/jap/113/10/10.1063/1.4794008
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/10/10.1063/1.4794008
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schemes of a co-axial (a) and cylindrical (b) surface-wave oscillators with 2D periodical gratings: (1)—hollow electron beam, (2)—outer corrugated conductor, and (3)—inner regular conductor, (c) unfolded corrugated surface (the directions of propagation of the partial wave beams are shown).

Image of FIG. 2.
FIG. 2.

Dispersion curves of the normal surface waves with different azimuthal indices m plotted at different scales ( ). Dashed lines are the light cone.

Image of FIG. 3.
FIG. 3.

Results of CST simulation of eigenmodes excitation by an initial e.m. pulse. Field spectrum is shown at the final stage of evolution when modes with various numbers of azimuthal variations are separated out (r0  = 2 cm,  = 10 cm, mm, and mm).

Image of FIG. 4.
FIG. 4.

Dependence of the increments of different azimuthal modes on the normalized system perimeter .

Image of FIG. 5.
FIG. 5.

(a) The time dependence of normalized efficiency and frequency shift . (b) Temporal dependencies of different azimuthal mode amplitudes during the onset of a steady-state regime on a symmetrical mode m = 0 for .

Image of FIG. 6.
FIG. 6.

(a) The time dependence of normalized efficiency and frequency shift . (b) Temporal dependencies of different azimuthal mode amplitudes during the onset of a steady-state regime on a symmetrical mode m = 0 for with all other parameters as in Fig. 5 .

Image of FIG. 7.
FIG. 7.

Spatial distributions of partial wave-beams (a) and (b) in the steady-state regime (all parameters as in Fig. 5 ).

Image of FIG. 8.
FIG. 8.

PIC simulations of a Ka band cylindrical surface-wave oscillator: (a) radiation spectrum, (b) the decomposition of the output radiation in the mode of regular cylindrical waveguide, (c) and (d) the spatial distribution of the longitudinal component of the electrical and magnetic fields in the steady-state oscillations regime.

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/content/aip/journal/jap/113/10/10.1063/1.4794008
2013-03-13
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Oversized co-axial and cylindrical surface-wave oscillators with two-dimensional periodical grating (quasi-optical model)
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/10/10.1063/1.4794008
10.1063/1.4794008
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