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Experimental study of a compact P-band coaxial relativistic backward wave oscillator with three periods slow wave structure
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10.1063/1.4748564
/content/aip/journal/pop/19/8/10.1063/1.4748564
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/8/10.1063/1.4748564
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic configuration of the compact P-band RBWO.

Image of FIG. 2.
FIG. 2.

The photo of the cathode used in the experiments.

Image of FIG. 3.
FIG. 3.

(a) The current waveform in the solenoidal field coils and (b) the measured magnetic field profile along the axial position of 3.5 cm off axis of the waveguide for the capacitors bank charged to 1.8 kV.

Image of FIG. 4.
FIG. 4.

Experimental setup for microwave diagnostics.

Image of FIG. 5.
FIG. 5.

The scheme of calibration of the gain of short dipole antenna.

Image of FIG. 6.
FIG. 6.

Microwave signal and its spectrum. Ch1: microwave waveform, Math1: spectrum.

Image of FIG. 7.
FIG. 7.

Experimental radiation pattern compared with the numerical result.

Image of FIG. 8.
FIG. 8.

Waveforms of the diode voltage, beam current, and output microwave signal. Ch1: diode voltage, Ch2: beam current, Ch3: microwave detector signal.

Image of FIG. 9.
FIG. 9.

Microwave power and efficiency versus diode voltage for the guide magnetic field of 0.86 T.

Image of FIG. 10.
FIG. 10.

Microwave frequency versus the diode voltage for the guide magnetic field of 0.86 T.

Image of FIG. 11.
FIG. 11.

Microwave frequency and efficiency versus guide magnetic field for the diode voltage of 572 kV, the structure parameters of the RBWO are unchanged.

Image of FIG. 12.
FIG. 12.

Microwave power and efficiency versus beam power for the guide magnetic field of 1.2 T.

Image of FIG. 13.
FIG. 13.

The mode-converting antenna (upper) and light from air breakdown near the output widow of the antenna (lower).

Image of FIG. 14.
FIG. 14.

Waveforms of the diode voltage, beam current, and output microwave signal when air breakdown is observed near the output window of the mode-converting antenna.

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/content/aip/journal/pop/19/8/10.1063/1.4748564
2012-08-29
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Experimental study of a compact P-band coaxial relativistic backward wave oscillator with three periods slow wave structure
http://aip.metastore.ingenta.com/content/aip/journal/pop/19/8/10.1063/1.4748564
10.1063/1.4748564
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