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Electron gun and CVD diamond window for a 346 GHz sheet beam BWO

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  • Branko Popovic
  • Yuan Zheng
  • Logan Himes
  • Diana Gamzina
  • Neville C. Luhmann Jr.
  • Claudio Paoloni
  • Rosa Letizia
  • Jinjun Feng
  • Ye Tang
  • Mengchao Gao
  • Fuzhi Zhang
  • Lingna Yue
  • Xiaopin Tang
  • Lu Ting


A collaboration between UC Davis, Lancaster University, Beijing Vacuum Electronics Research Institute (BVERI), and the University of Electronic Science and Technology of China (UESTC) is developing a 346 GHz backward wave oscillator (BWO) for use as a high frequency RF source in plasma fusion diagnostics, medical, biological, and security imaging systems. Development of new electron gun optics that achieve almost 100% beam transmission based on particle-in-cell simulations is presented along with comparisons of the cold and hot beam. Also, a CVD diamond pillbox window design is presented. Additionally, the mechanical layout of the devices is being completed and prepared for fabrication.