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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...
Supercapacitors, a new energy storage element based on electrochemical double layer capacitance, store energy by ion adsorption, have recently attracted increasing interest with the sharp development of nanostructure materials. Supercapacitors store and release energy by nanoscopic charge separation at the interface between an electrode and an electrolyte, and the energy restored in it is inversely...
The design and simulation of a harmonic gyrotron based on a cusp electron gun is presented. The gyrotron is operated at the 7th electron cyclotron harmonic with an output frequency of ∼390 GHz and mode pattern of TE71. A large orbit electron beam with energy of 40 keV, beam current of 1.5A and an adjustable pitch alpha from 1 to 3 from a cusp gun is used to drive the beam-wave interaction. Smooth...
To realize the full potential of a Gyrotron backward wave oscillator (Gyro-BWO), an energy recovery system was designed using Particle-In-Cell (PIC) simulations and optimized using both a Genetic Algorithm and PIC simulations. Simulations were carried out to optimize a periodic structure for separation of the spent electron beam and the output radiation produced by a gyro-BWO in the 8.0 – 9.5GHz frequency...
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