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Linear and saturated characteristics of a coaxial-waveguide gyrotron backward-wave oscillator
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10.1063/1.3192763
/content/aip/journal/pop/16/8/10.1063/1.3192763
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/8/10.1063/1.3192763
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Projection of electron orbit (circle) on the cross-sectional plane of the waveguide in the presence of a uniform magnetic field. Point O is the center of the coaxial waveguide. and are the inner and outer radii of the coaxial waveguide, respectively. Point A is the guiding center of the gyrating electron. Point B is the instantaneous position of the electron. is the electron Larmor radius. (b) Drawings of the coaxial gyro-BWO under study.

Image of FIG. 2.
FIG. 2.

The diagram of a coaxial waveguide mode (parabola) and beam-wave synchronism line (oblique line). The intersection in the backward wave region is the coaxial gyro-BWO operating point. Parameters used are: beam voltage , velocity ratio , and . The inner radius and the outer radius of the coaxial waveguide are 0.45 and 0.945 cm, respectively.

Image of FIG. 3.
FIG. 3.

(a) Outer radius vs parameter . The cutoff frequency of the operating mode is fixed at 30.8856 GHz . (b) The coupling coefficient at the optimum (solid line) and at (dots) vs parameter when operating in mode at the fundamental harmonic. Parameters are: , , and .

Image of FIG. 4.
FIG. 4.

Axial profiles of field amplitude (solid line), phase angle (dotted line), and beam energy deposition rate (dashed line) for the first three axial modes at their start-oscillation currents . Parameters used are: beam voltage , velocity ratio , , , and .

Image of FIG. 5.
FIG. 5.

(a) Start-oscillation currents vs interaction length . (b) Normalized start-oscillation frequencies (solid line) and transit angles (dashed line) vs interaction length . Notably, is the cutoff frequency of the mode. The other parameters are the same as those in Fig. 4.

Image of FIG. 6.
FIG. 6.

(a) Start-oscillation currents vs magnetic field . (b) Normalized start-oscillation frequencies (solid line) and transit angles (dashed line) vs the magnetic field . The other parameters are the same as those in Fig. 4.

Image of FIG. 7.
FIG. 7.

(a) Start-oscillation currents vs parameter . (b) Normalized start-oscillation frequencies (solid line) and transit angles (dashed line) vs parameter . The other parameters are the same as those in Fig. 4.

Image of FIG. 8.
FIG. 8.

Axial field profiles of the first three axial modes for several values at their start-oscillation currents . Solid curves, empty triangles and crosses mark calculated results for , , and , respectively. The other parameters are the same as those in Fig. 4.

Image of FIG. 9.
FIG. 9.

Efficiency (a) and normalized oscillation frequency (b) of the fundamental axial mode vs interaction length for (solid line), (dotted line), and (dashed line). The and other parameters are the same as those listed in Fig. 4.

Image of FIG. 10.
FIG. 10.

Axial profiles of field amplitude (solid line) and beam energy deposition rate (doted line) at the fundamental axial mode for (a) , (b) , (c) , and (d) . The , , and other parameters are the same as those listed in Fig. 4.

Image of FIG. 11.
FIG. 11.

Saturated efficiency (a) and normalized oscillation frequency (b) of the fundamental axial mode vs the magnetic field for (solid line), (dotted line), and (dashed line). The and other parameters are the same as those listed in Fig. 4.

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/content/aip/journal/pop/16/8/10.1063/1.3192763
2009-08-03
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Linear and saturated characteristics of a coaxial-waveguide gyrotron backward-wave oscillator
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/8/10.1063/1.3192763
10.1063/1.3192763
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