Energy recovery system for a W-band gyro-BWO

L. Zhang, W. He, C. R. Donaldson, A. W. Cross, A. D. R. Phelps, P. McElhinney, K. Ronald

Research output: Chapter in Book/Report/Conference proceedingConference contribution book


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 to achieve the optimum overall recovery efficiency for specific parameters of the spent beam. Secondary electron emissions were simulated to investigate the effects of the secondary electrons on the overall recovery efficiency and the backstreaming of the electrons from the collector region.
Original languageEnglish
Title of host publication2012 37th International Conference on Infrared, Millimeter, and Terahertz Waves
Place of PublicationPiscataway, N.J.
Number of pages2
ISBN (Print)978-1-4673-1598-2
Publication statusPublished - 13 Dec 2012


  • backward wave oscillator
  • genetic algorithm
  • secondary electron emission


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