The transverse structure of the lossy DL waveguide.
The longitudinal structure of the lossy DL waveguide-loaded gyro-TWT.
Beam wave cold dispersion relations in (a) the linear stage (uniform lossy DL waveguide) and (b) the nonlinear stage (empty waveguide).
Normalized transverse distributions of the key mode electric energy density in the lossy DL waveguide. The inner circles indicate the dielectric-vacuum interfaces and the area between an inner circle and an outer circle is the dielectric region.
The normalized field profiles of the spurious oscillation modes when , , , and the magnetic is assumed to be in the entire circuit.
The influence of the nonlinear stage length on the start-oscillation currents of the spurious modes when , , and the magnetic is assumed to be in the entire circuit.
The influence of tapering magnetic strength near the downstream port of the nonlinear stage to the start-oscillation currents of the spurious modes when , , and .
Propagation characteristics sensitivity of the mode at 35 GHz to the variation in (a) the relative permittivity , (b) the loss tangent , and (c) the dielectric thickness .
The sensitivity of the linear growth rate of the operating mode in the DL waveguide to the variation in (a) the relative permittivity, (b) the loss tangent, and (c) the dielectric thickness. A monoenergetic electron beam is assumed, calculated by the linear theory in DL waveguide.
The influences of the DL waveguide length , the loss tangent of the material , beam velocity spread , on the amplification performance (35 GHz).
(a) The sensitivity of the output power to the permittivity of the DL waveguide, (b) the amplification profile and the interaction efficiency, and (c) the saturated output power and total gain of the system under the design parameters given in Table I. The electron beam velocity spread is assumed to be 3%.
The design parameters of the Ka-band DL waveguide-based gyro-TWT.
Article metrics loading...
Full text loading...