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Effects of tapering structures on the characteristics of a coaxial-waveguide gyrotron backward-wave oscillator
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10.1063/1.3647484
/content/aip/journal/pop/18/10/10.1063/1.3647484
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/10/10.1063/1.3647484
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic drawings of the coaxial gyro-BWO with a slightly tapered inner radius and slightly tapered outer radius. Radii and are the inner and outer radii at the position (the midpoint point between the upstream end and the downstream end ), respectively. Additionally, angles and represent the taper angle of the inner wall and the taper angle of the outer wall, respectively.

Image of FIG. 2.
FIG. 2.

Root (solid line) and (dashed line) of mode versus the parameter , where is the ratio of the outer radius to the inner radius at the position .

Image of FIG. 3.
FIG. 3.

Dependence of coupling strength on normalized guiding-center radius at different values for (a) and (b) modes.

Image of FIG. 4.
FIG. 4.

(a) and (b) Profiles of inner wall radii and the equivalent hollow waveguide radii. (c)-(e) Field amplitudes (solid line) and beam energy deposition rates (dotted line) of mode at their start-oscillation currents for inner taper angles  = , , and . Parameters used are  = 100 kV,  = 13.0 kG,  = 1.0,  = 0.54,  = 2.5,  = 1.625 cm,  =  = 1.0 cm,  = 10 cm,  = , and  =  = (=1.72 × 10−8 Ωm).

Image of FIG. 5.
FIG. 5.

Start-oscillation currents (a) and start-oscillation frequencies (b) versus the taper angle of the inner wall for  = 13.0 kG, 13.5 kG, and 14.0 kG. The other parameters are the same as those used in Fig. 4.

Image of FIG. 6.
FIG. 6.

Start-oscillation currents versus magnetic field for (a) several inner taper angles and (b) several outer taper angles . The outer taper angle  =  in (a) and the inner taper angle  =  in (b). Other parameters are the same as those used in Fig. 4.

Image of FIG. 7.
FIG. 7.

Start-oscillation currents versus parameter for (a) several inner taper angles and (b) several outer taper angles .  = 1.12 , where is the grazing magnetic of mode. The outer taper angle  =  in (a) and the inner taper angle  =  in (b). Other parameters are the same as those used in Fig. 4.

Image of FIG. 8.
FIG. 8.

Start-oscillation currents of and modes versus parameter for inner taper angles  =  and . The magnetic field  = 13.24 kG and other parameters are the same as those used in Fig. 4.

Image of FIG. 9.
FIG. 9.

(a) Profile of outer wall radius. (b) Field amplitudes and (c) beam energy deposition rates of the operating mode at  = 10 A for outer taper angles  = , , and . Parameters used are  = 100 kV,  = 13.4 kG,  = 1.0,  = 0.54,  = 2.6,  = 1.625 cm,  =  = 1.0 cm,  = 10 cm,  = , and  =  = ( = 1.72 × 10−8 Ωm).

Image of FIG. 10.
FIG. 10.

Calculated (a) efficiency and (b) oscillation frequency versus magnetic field for several outer taper angles . Other parameters are the same as those used in Fig. 9.

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/content/aip/journal/pop/18/10/10.1063/1.3647484
2011-10-12
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of tapering structures on the characteristics of a coaxial-waveguide gyrotron backward-wave oscillator
http://aip.metastore.ingenta.com/content/aip/journal/pop/18/10/10.1063/1.3647484
10.1063/1.3647484
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