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Nonlinear full-wave-interaction analysis of a gyrotron-traveling-wave-tube amplifier based on a lossy dielectric-lined circuit
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10.1063/1.3339935
/content/aip/journal/pop/17/3/10.1063/1.3339935
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/3/10.1063/1.3339935

Figures

Image of FIG. 1.
FIG. 1.

The transverse structure of the lossy DL waveguide.

Image of FIG. 2.
FIG. 2.

The longitudinal structure of the lossy DL waveguide-loaded gyro-TWT.

Image of FIG. 3.
FIG. 3.

Beam wave cold dispersion relations in (a) the linear stage (uniform lossy DL waveguide) and (b) the nonlinear stage (empty waveguide).

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

The normalized field profiles of the spurious oscillation modes when , , , and the magnetic is assumed to be in the entire circuit.

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

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 .

Image of FIG. 8.
FIG. 8.

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 .

Image of FIG. 9.
FIG. 9.

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.

Image of FIG. 10.
FIG. 10.

The influences of the DL waveguide length , the loss tangent of the material , beam velocity spread , on the amplification performance (35 GHz).

Image of FIG. 11.
FIG. 11.

(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%.

Tables

Generic image for table
Table I.

The design parameters of the Ka-band DL waveguide-based gyro-TWT.

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/content/aip/journal/pop/17/3/10.1063/1.3339935
2010-03-10
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nonlinear full-wave-interaction analysis of a gyrotron-traveling-wave-tube amplifier based on a lossy dielectric-lined circuit
http://aip.metastore.ingenta.com/content/aip/journal/pop/17/3/10.1063/1.3339935
10.1063/1.3339935
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