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High-power, stable Ka/V dual-band gyrotron traveling-wave tube amplifier
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) diagram of a dual-band gyro-TWT. The operating modes (points 1 and 2) and possible oscillating modes (points 3-7) are indicated. The dispersion curves correspond to the transverse modes of a coaxial waveguide with an outer radius  = 0.4142 cm and  = 1.9, where is the ratio of the outer radius to the inner radius . Parameters used are:  = 70 kV,  = 1.0, and  = 11.3 kG. (b) Schematic drawing of the dual-band gyro-TWT with distributed losses.

Image of FIG. 2.
FIG. 2.

Eigenvalues of and modes (solid line) and the value (dashed line) versus parameter , where is the grazing magnetic field of the mode.

Image of FIG. 3.
FIG. 3.

(a) Axial profiles of the resistivity . (b)-(e) Axial field profiles of the four most likely oscillating modes (points 3, 1, 4, and 2 in Fig. 1) at their respective start-oscillation currents. Two cases are calculated: light losses ( = 1.0 103 , dashed lines) and heavy losses ( = 1.0 105 , solid line), where .

Image of FIG. 4.
FIG. 4.

Calculated start-oscillation currents versus (a) the resistivity and (b) the resistivity . The resistivity  =  in (a) and  =  in (b).

Image of FIG. 5.
FIG. 5.

Calculated start-oscillation currents versus parameter . The applied magnetic field is kept at the grazing magnetic field of mode. The resistivity  = 5.5 105 and  = .

Image of FIG. 6.
FIG. 6.

Saturated output power (solid line) and gain (dashed line) versus the frequency in the (a) Ka and (b) V bands.


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Scitation: High-power, stable Ka/V dual-band gyrotron traveling-wave tube amplifier