Schematic configuration of the compact P-band RBWO.
The photo of the cathode used in the experiments.
(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.
Experimental setup for microwave diagnostics.
The scheme of calibration of the gain of short dipole antenna.
Microwave signal and its spectrum. Ch1: microwave waveform, Math1: spectrum.
Experimental radiation pattern compared with the numerical result.
Waveforms of the diode voltage, beam current, and output microwave signal. Ch1: diode voltage, Ch2: beam current, Ch3: microwave detector signal.
Microwave power and efficiency versus diode voltage for the guide magnetic field of 0.86 T.
Microwave frequency versus the diode voltage for the guide magnetic field of 0.86 T.
Microwave frequency and efficiency versus guide magnetic field for the diode voltage of 572 kV, the structure parameters of the RBWO are unchanged.
Microwave power and efficiency versus beam power for the guide magnetic field of 1.2 T.
The mode-converting antenna (upper) and light from air breakdown near the output widow of the antenna (lower).
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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