Abstract
The design and experimental demonstration of an X-band coaxial dual-frequency relativistic backward wave oscillator (CRBWO) with sectioned slow wave structures (SWSs) is presented. In this paper, we describe the experimental measurement methods of frequency, power and operation mode for the high-power microwave signal. In experimental tests, with a 500 kV, 11.5 kA beam guided by a 0.82 T magnetic field, a microwave with an average power of 507 MW and pulsewidth of 50 ns has been obtained. Also, the dominant frequencies of the X-band dual frequency are 9.845 GHz and 10.517 GHz, and the dual-frequency difference ${\Delta }{f}\approx {672}$ MHz, which was similar to the particle-in-cell simulation results. The operation mode of the device is determined to be TM01 mode in our experiment.
Highlights
High power vacuum electron devices attract many researchers because it is widely used in the industry and in science [1]–[5]
EXPERIMENTAL SETUP The experimental system mainly consists of the following parts: (1) Pulsed intense current relativistic electron beam accelerator; (2) Dual-frequency coaxial relativistic backward wave oscillator (CRBWO) high-frequency system; (3) Pulse magnetic field system; (4) Radiation system
The accelerator voltage was adjusted at 500 ± 3% kV, which was similar to the PIC simulation results
Summary
High power vacuum electron devices attract many researchers because it is widely used in the industry and in science [1]–[5]. To produce dual-frequency microwaves, many different dual-frequency devices have been elaborated, including the magnetically insulated line oscillator (MILO) and the relativistic backward wave oscillator (RBWO) [10]–[12]. Ginzburg et al [13] investigated dual-frequency RBWO with sectioned slow wave structures (SWSs) based on a single relativistic electron-beam.
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