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High quality intense electron beams play an important role in high power millimeter-wave and terahertz radiation generation. To this end, the pseudospark-sourced electron beam has been investigated with their applications in different beam-wave interaction structures. Different structures have been designed and modelled using the particle-in-cell codes MAGIC and CST Particle Studio. The experimental...
The pseudospark discharge is a form of low-pressure gas discharge capable of generating extremely high currents with short rise times by means of a unique hollow cathode structure [1-6]. A high-quality electron beam is generated during the later phases of the discharge process, which possesses high current density and brightness, as well as the ability to self-focus via ion channel focusing. This...
Design and experimental study of a wide-band U-band gyrotron travelling wave tube (gyro-TWT) amplifier are presented. The interaction circuit is constructed by periodic loaded dielectric, which provided required loss for stable operation. Potential oscillations are effectively suppressed. The U-band gyro-TWT is zerodriven stable at the operating points. A saturated peak power of 158 kW was measured...
Coherent terahertz radiation obtained from double bunched sheet electron beams over a surface evanescent wave provides an effective method to extend the operating frequency and power capacity. An overmoded ridge-loaded grating waveguide was introduced in our double sheet beam backward wave oscillator (BWO) design. The fundamental mode TM11 was updated to the TM21++ mode, which is compact to integrate...
Cold test results of a G-band sheet beam backward wave oscillator (BWO) with a double grating waveguide, fabricated by wire cutting and a 3D printing technique, are presented in this paper. The dispersion curve and S-parameters of the BWO slow wave circuit and Bragg reflector were measured and the results compared to the numerical modelling and analytical theory.
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