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We report a W-band backward-wave oscillator using micro-fabrication technologies by which a fully 3-dimensional slow-wave interaction circuit is successfully employed on multi-bonded silicon wafers. MEMS (micro-electromechanical systems) technologies such as deep RIE (reactive ion etching) and thermocompressive hermetic bonding are applied to achieve highly accurate dimensional structures for high...
Latest results from a second harmonic gyro-TWA experiment at Strathclyde University are presented. The Ka-band experiment uses a helically corrugated waveguide. Simulations have been performed to predict the amplifier gain and bandwidth. The simulations are compared to laboratory measurements of the cold waveguide dispersion using a new, improved design of polarization converter.
An energy recovery system using a four-stage depressed collector was simulated and designed to improve the overall efficiency of the W-band gyrotron backward wave oscillator (gyro-BWO) in the University of Strathclyde. The spent beam information was exported from the simulation of the gyro-BWO using the 3D PIC code MAGIC. The geometry of the depressed collector was optimized using a genetic algorithm...
In order to study the nonlinear beam-wave interaction for sheet beam klystrons more efficiently, a calculation code of SBK2D based on a 2D rod shaped macro-particle model is developed and used to simulate and analyze a high power W-band sheet beam klystron with 8 multiple gap barbell cavities. More than 50kW high frequency output with the efficiency of 20% and gain of 38 dB are observed, and the results...
A thermionic cusp electron gun has been designed, numerically optimized and experimentally measured and is presented. A 40 kV, 1.5 A annular axis-encircling electron beam has been simulated to generate a beam with low velocity and alpha spreads. The electron gun performance has been verified through experiments and the results are given.
The folded rectangular groove guide, an original slow-wave structure (SWS) , which is evolved from a conventional rectangular groove guide by bending the groove along its longitudinal direction, can operate with the sheet electron beam or the circular electron beam. The groove shape can be various,such as triangle, circle, trapezoid, etc. The electromagnetic characteristics, and the beam-wave interaction...
Pseudospark electron beams of micro-sizes have been measured recently and their application to millimeter-wave and terahertz radiation generation is being investigated. A three cavity 94 GHz klystron using a micro-sized beam has been designed and simulated and is currently being constructed.
Start-to-end calculation has been performed to estimate the performance of the THz FEL system using a photocathode RF gun which will be installed to existing MIR-FEL (KU-FEL) system at Institute of Advanced Energy, Kyoto University. The aim of this system is a test bench to realize the table-top THz system. The electron beam properties have been evaluated from the photocathode RF gun to the entrance...
To achieve a narrow-band THz coherent Cherenkov radiation, the excited wakefield should be periodic and has a sin-like profile in time domain. Because the the wakefield pulse is similar to the driven bunch shape, the condition of narrow-band THz radiation is determined by a simple expression and verified by the commercial software CST PS.
It is important to keep the frequency of higher-frequency operating mode twice or triple as large as that of the lower-frequency operating mode in the dual-frequency operation terahertz coaxial gyrotron with two electron beams. From the practical point of view, the effects of a possible tilted or shifted inner rod of a coaxial gyrotron cavity on the ohmic loss distribution, the resonant frequency,...
A 0.1 THz 10 W clinotron is numerically and experimentally investigated for compact high-power terahertz radiation source. The output characteristics of the clinotron with the inclined sheet electron beam are examined by using the 3D particle-in-cell simulation code MAGIC and are compared with the measurements.
Using a cavity based on a periodic-surface-lattice (PSL) the concept of a high-power, 200GHz Cherenkov source is developed. If the PSL satisfies certain defined conditions single mode operation is observed.
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