Title :
Study on the Radial-Sheet-Beam Electron Optical System
Author :
Wang, Shaomeng ; Gong, Yubin ; Wei, Yanyu ; Duan, Zhaoyun
Author_Institution :
Nat. Key Lab. of Sci. & Technol. on Vacuum Electron., Univ. of Electron. Sci. & Technol. of China, Chengdu, China
Abstract :
A new kind of radial-sheet-beam electron optical systems in W-band radial-sheet-beam traveling-wave tubes was described in this paper. A cylindrical cathode with an arc emitting surface was adopted to produce a 2-kV 2-A radial sheet electron beam. The effects of cathode size and anode size on the space-charge-limited current were studied. The electron-beam formation and transmission were discussed under the condition of the space-charge-limited current, and the radial Brillouin focusing magnetic field was obtained. This kind of electron optical systems was simulated by the particle-in-cell method to check up the design. The simulation results presented in this paper show that the beam transmission attained 100% over a distance of 35 mm with a fill factor of ~ 0.55.
Keywords :
anodes; cathodes; electron beams; electron optics; magnetic fields; travelling wave tubes; TWT; W-band radial-sheet-beam traveling-wave tubes; anode size; arc emitting surface; cathode size; current 2 A; cylindrical cathode; electron-beam formation; electron-beam transmission; fill factor; particle-in-cell method; radial Brillouin focusing magnetic field; radial-sheet-beam electron optical system; space-charge-limited current; voltage 2 kV; Anodes; Cathodes; Electron beams; Electron optics; Focusing; Electron optical system; focusing; radial; sheet beam; space-charge limit;
Journal_Title :
Plasma Science, IEEE Transactions on
DOI :
10.1109/TPS.2012.2218623
