Propagation characteristics of a premodulated electron beam

Author

Jin, Jeong-Gu ; Park, Gun-Sik ; Uhm, Han S.

Author_Institution

Dept. of Phys., Seoul Nat. Univ., South Korea

Volume

26

Issue

3

fYear

1998

fDate

6/1/1998 12:00:00 AM

Firstpage

794

Lastpage

798

Abstract

The propagation properties of an electron beam whose energy and current are simultaneously premodulated at the cathode are investigated by computer simulation using the two-dimensional (2-D) particle-in-cell code, MAGIC. The simulation is carried out to investigate the influence of the initial energy modulation and the phase difference between current and energy modulation. With appropriate initial energy modulation, the amplitude of the downstream current modulation can be kept as high as the initial modulation level. Appreciable growth of high harmonic components is also observed as the electron beam debunches. The simulation data are compared with results obtained from a nonlinear theory of the current modulation in an electron beam propagating through a drift tube. It is shown that the simulation data agree remarkably well with the analytical theory

Keywords

beam handling techniques; electron beams; electron tubes; microwave tubes; simulation; MAGIC; analytical theory; computer simulation; current modulation; drift tube; electron beam debunching; energy modulation; high harmonic components; nonlinear theory; premodulated electron beam; propagation characteristics; two-dimensional particle-in-cell code; Amplitude modulation; Analytical models; Cathodes; Computational modeling; Computer simulation; Electron beams; Electron tubes; Optical modulation; Phase modulation; Two dimensional displays;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.700835

Filename

700835