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Gain analysis of higher-order-mode amplification in a dielectric-implanted multi-beam traveling wave structure
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10.1063/1.4813800
/content/aip/journal/pop/20/7/10.1063/1.4813800
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/7/10.1063/1.4813800
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) Dielectric loaded multi-beam traveling wave amplifier with AlN absorbers (top and bottom), (b) electric field (E) distribution of the first three modes of the circuit at the plane denoted in Fig. 1(a) (the green-colored box in the dashed line of Fig. 1(a) is the area for the field plots of Fig. 1(b) ), (c) dispersion curves of three slow wave modes (TM, TM, and TM) and 10 kV beam line.

Image of FIG. 2.
FIG. 2.

Transmission of the TM, TM, and TM modes in an overmoded double grating waveguide (a) without and (b) with implanting AlN absorbers.

Image of FIG. 3.
FIG. 3.

(a) Quality factor ( ) and (b) cavity impedance () versus frequency of the unit cell for  1 mm.

Image of FIG. 4.
FIG. 4.

(a) Pierce impedance ( ), (b) gain growth/beam, (c) gain/beam vs. frequency of the unit cell for  = 1 mm

Image of FIG. 5.
FIG. 5.

PIC simulation result (electron energy distribution) of the designed circuit with  = 7 cm. The electron bunching in the 2nd beam is anti-phased (phase difference = 180°) with that of the 1st and 3rd beams.

Image of FIG. 6.
FIG. 6.

(a) Gain versus time graph, calculated from PIC simulation at 71 GHz input driving frequency. Gain versus frequency graphs from theory and simulations (simulation-I:  = 50 mA, simulation-II:  = 150 mA) (b) without loss (  = 0) and (c) with loss (  = 1).

Image of FIG. 7.
FIG. 7.

(a) Input port signal with zero driving signal and (b) fast Fourier transformed (FFTed) input port spectrum (c) output port signal with no driving signal and (d) FFTed output port spectrum.

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/content/aip/journal/pop/20/7/10.1063/1.4813800
2013-07-11
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Gain analysis of higher-order-mode amplification in a dielectric-implanted multi-beam traveling wave structure
http://aip.metastore.ingenta.com/content/aip/journal/pop/20/7/10.1063/1.4813800
10.1063/1.4813800
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