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W-band gyro-BWO with a four-stage depressed collector

Zhang, Liang and He, Wenlong and Donaldson, Craig R. and Cross, Adrian W. and Phelps, Alan D.R. and McElhinney, Paul and Ronald, Kevin (2011) W-band gyro-BWO with a four-stage depressed collector. Terahertz Science & Technology, 4 (3). pp. 76-84.

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    Abstract

    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) at 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 to achieve the optimum overall recovery efficiency for specific parameters of the spent beam. Secondary electron emissions and their effects on the recovery efficiency and the backstreaming of the electrons from the collector region were simulated. The heat power distribution on the electrodes was also simulated to avoid the “hot spot”.