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Stabilization of the potential multi-steady-state absolute instabilities in a gyrotron traveling-wave amplifier
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10.1063/1.3254374
/content/aip/journal/pop/16/10/10.1063/1.3254374
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/10/10.1063/1.3254374

Figures

Image of FIG. 1.
FIG. 1.

The cold dispersion relation of the fundamental mode gyro-TWT.

Image of FIG. 2.
FIG. 2.

The longitudinal structure of the interaction waveguide of the gyro-TWT.

Image of FIG. 3.
FIG. 3.

The effects of the taper length on (a) the field profiles and (b) the thresholds of the mode gyro-BWO in the coupler stage.

Image of FIG. 4.
FIG. 4.

The effect of the loss to the critical lengths of the potential absolute instabilities. .

Image of FIG. 5.
FIG. 5.

The frequency-dependent growth rate of instabilities at various beam currents, obtained using a loaded linear stage having distributed loss .

Image of FIG. 6.
FIG. 6.

The first three local axial modes of the mode absolute instability .

Image of FIG. 7.
FIG. 7.

The first three local axial modes of the mode gyro-BWO .

Image of FIG. 8.
FIG. 8.

The influence of the length of the nonlinear stage to threshold currents of (a) the first three local axial modes of the mode absolute instability, and (b) the first three local axial modes of the mode gyro-BWO .

Image of FIG. 9.
FIG. 9.

The effects of magnetic tapering to threshold of (a) the ninth global axial modes of the mode absolute instability and (b) the sixth global axial mode of the mode gyro-BWO.

Image of FIG. 10.
FIG. 10.

The effect of the downstream port reflection to the of the mode absolute instability.

Image of FIG. 11.
FIG. 11.

The effects of magnetic tapering to the dynamic range of the amplifier. It is calculated at 33.67 GHz and the electron beam is assumed with zero velocity spread.

Image of FIG. 12.
FIG. 12.

The longitudinal power vs axial position profile during normal amplification. The field self-excited by a prebunched beam and the field amplified by a monolithic beam are also included for comparison.

Image of FIG. 13.
FIG. 13.

The output power of the system under a constant input power of 0.1 W. The output power without magnetic tapering, but with beam velocity spread , is also included for comparison.

Tables

Generic image for table
Table I.

The design parameters of a Ka-band mode gyro-TWT.

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/content/aip/journal/pop/16/10/10.1063/1.3254374
2009-10-30
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Stabilization of the potential multi-steady-state absolute instabilities in a gyrotron traveling-wave amplifier
http://aip.metastore.ingenta.com/content/aip/journal/pop/16/10/10.1063/1.3254374
10.1063/1.3254374
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