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Linear and nonlinear behaviors of gyrotron backward wave oscillators
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10.1063/1.3688892
/content/aip/journal/pop/19/2/10.1063/1.3688892
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/2/10.1063/1.3688892
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Figures plot (a) the start oscillation current versus the system size L and (b) the absolute growth rate versus for a cold electron beam with the beam voltage , the transverse-to-longitudinal velocity ratio , and the guiding center radius . The start oscillation current in (b) is corresponding to the interaction length . The externally applied magnetic field is and the uniform waveguide radius is .

Image of FIG. 2.
FIG. 2.

Figures plot the EM field profiles for at (a) and (b) (the solid line), respectively. The EM field profile for and (the dashed line) is plot in (b) for demonstrating that the effective length of the contracted field profile can be determined by the start oscillation length at the same beam current. Other operating parameters are the same as shown in Fig. 1.

Image of FIG. 3.
FIG. 3.

Figures plot (a) the spatial variation of particle trajectories in the phase space and (b) the resonance detuning (averaged over all electrons) versus z, respectively, for . Other operating parameters are the same as shown in Fig. 2(b).

Image of FIG. 4.
FIG. 4.

Figures plot (a) the maximum resonance detuning versus the maximum field amplitude (the corresponding beam current ) and (b) the effective length versus the maximum field amplitude (the corresponding beam current ), respectively. The complementary scalings of the resonance detuning and the effective length with the maximum field amplitude illustrate that the nonlinear field contraction is induced by the detuning of the resonance condition. Other operating parameters are the same as shown in Fig. 2(b).

Image of FIG. 5.
FIG. 5.

Figures plot the output power of the gyro-BWO versus (a) at and (b) at , respectively. The start oscillation current in is corresponding to the interaction length . The corresponding power scaling laws are also shown in the figures. Other operating parameters are the same as shown in Fig. 2(b).

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/content/aip/journal/pop/19/2/10.1063/1.3688892
2012-02-28
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Linear and nonlinear behaviors of gyrotron backward wave oscillators
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/2/10.1063/1.3688892
10.1063/1.3688892
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