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(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.
Eigenvalues of and modes (solid line) and the value (dashed line) versus parameter , where is the grazing magnetic field of the mode.
(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 .
Calculated start-oscillation currents versus (a) the resistivity and (b) the resistivity . The resistivity = in (a) and = in (b).
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 = .
Saturated output power (solid line) and gain (dashed line) versus the frequency in the (a) Ka and (b) V bands.
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