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The Orotron is a device which is capable of producing moderate (few watts) to high power levels (few kilowatts) of millimeter and sub-millimeter wavelength radiation in the frequency range from GHz to Terahertz. It consists of an open resonator containing rectangular metal grating periodic RF structure and a sheet electron beam. In this paper, 100 GHz RF interaction structure for Orotron has been...
Slow wave structure employed in a wide-band helix traveling wave tube (TWT) always support backward waves. A backward wave space harmonic of a signal at a harmonic of the drive signal can effectively interact with slow space-charge wave of an electron beam. The minus first space harmonic is in synchronism with the beam at some frequencies. As a consequence, the backward wave can compete with the forward...
The fundamental method of the design of an ultra-broadband helix traveling wave tube (TWT) with two-section output circuit was analyzed using Pierce small signal theory, and shaped a special helix pitch profile with reduced phase-velocity followed by a positive phase-velocity taper. The slow wave structure with semi-metallic rods, which has good thermal dissipation capability and gives negative dispersion...
CEERI and TU-Berlin have recently started a cooperation to design and build a W-band folded waveguide TWT. In this paper and the corresponding talk we give an insight into the design process of the slow wave structure and present detailed simulation results of the chosen folded waveguide. Due to the long calculation times of the complete structure, pic simulation were still running when writing this...
In this paper, a scheme of obtaining the maximum theoretical overall efficiency is explored by optimizing the helix pitch profile of a TWT based on the collectability of spent beam. The detailed design of a Ku-band helix TWT is described according to three optimization goals (theoretical overall efficiency, theoretical collector efficiency and electronic efficiency). The simulation results indicate...
A 1000 W Ka-band Traveling-Wave Tube (TWT) was fabricated with Folded Waveguide as its slow wave structure. Based on the previous experiment, the phase velocity taper technology was applied in this TWT. Also the sever structure and output structure of the TWT were improved. The test result shows it can produces over 1000 W of saturation output power in 2 GHz bandwidth and the electron efficient is...
The dispersion curve of a ka-band slow wave structure consisting of modified photonic band gap is tested by resonant method. A mode launcher combined with a wheel radiator and coupling probe has successfully excited all the resonant modes of TM01-like mode in cold test.
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