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BWO-circuit was designed to generate hundreds MW electromagnetic wave on X-band in this study. A RF coupler is designed and fabricated to measure the power of an electromagnetic wave which is generated in the slow wave structure of a relativistic backward wave oscillator (RBWO) before this wave is radiated through an antenna. To pickup about -63 dB of total output power and avoid a RF breakdown in...
BWO-circuit was designed to generate hundreds MW electromagnetic wave on X-band in this study. A RF coupler is designed and fabricated to measure the power of an electromagnetic wave which is generated in the slow wave structure of a relativistic backward wave oscillator (RBWO) before this wave is radiated through an antenna. To pickup about -63 dB of total output power and avoid a RF breakdown in...
A Smith-Purcell radiation source using a grating structure modified in a cylindrical manner was considered to utilize a high power relativistic annular electron beam. The output characteristics were confirmed by numerical simulations assuming a 500 keV-5 kA electron beam. The experiment is being prepared.
A competition between two axial mode of TM01 is observed in the experiment of a L-band magnetically insulated transmission line oscillator (MILO) (D. H. Kim, et al., 2007). This mode competition can be affected by anode plasma formation during the operation. The transient time between two modes becomes shorter with additional anode plasma in MAGIC2D simulation.
Relativistic backward wave oscillator (RBWO) is the suitable source for generating high power electromagnetic wave (HPEM). The RBWO has a high efficiency by means of the interaction region between a backward wave and an electron beam. However, the pulse shortening problem occurs frequently in experiments of RBWO because of the RF breakdown on rippled slow wave structure. Experimental study is done...
A RBVVO is capable of high efficiency by a relatively long interaction region between a backward wave and an electron beam. But the pulse shortening problem occurs frequently in experiments of RBWOs because of the mode competition, the RF breakdown and so on (S.D. Korovin et al., 2000). In our previous research of the 100MW RBWO, it shows that the mode competition can depends on the beam radii and...
Summary form only given. Experimental research on L-band magnetically insulated transmission line oscillator (MILO) is carried out for the generation of the microwave of ~GW power. This MILO is composed of 6-uniform cavities and single coupling cavity and two choke cavities. The measured output power of 2.8 GW shows a reasonable agreement with the simulated one of 2.75 GW. In this experiment, 500...
A mode competition phenomenon of gigawatts-nanonoseconds magnetically insulated transmission line oscillator (MILO) is experimentally investigated. A pulsed power system of 500 kV-35 kA and 130 ns pulse length is used for generating the relativistic electron beam. The microwave with peak power of 2.8 GW, pulse duration of 70 ns, and frequency of 1.14 GHz is observed. A spatiotemporal measurement using...
A Relativistic backward wave oscillator (RBWO) is a reliable source of a high power electromagnetic wave (HPEM). The RBWO is capable of high efficiency by a relatively long interaction region between a backward wave and an electron beam. But the pulse shortening problem occurs frequently in experiments of RBWO because of the mode competition, the RF breakdown and so on. After this mode competition...
An rippled-wall RBWO is operated at the beam voltage of 250~400kV and current of 2.1~3.4 kA using the 130nsec, single shot using Seoul National University's electron beam accelerator (SEBA). SEBA produces a hollow beam of 19.2mm-outer radius, 0.7-thickness guided by an axial magnetic field of 1.7-3.4 Tesla. The uniform ripple has a period of 11mm, mean radius of 14mm and ripple amplitude of 2mm. A...
Experimental works on magnetically insulated transmission line oscillator (MILO) have been carried out for generation of microwave with the GW power level. An efficient power extraction is achieved by employing a new coupling structure designed by the matching condition of phase velocities between the interaction circuit and output circuit As a first experiment, a MILO composed of 6-uniform cavities...
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