TM-FEL with a longitudinal wiggler and an annular beam

Author

Schächter, L. ; Davis, T.J. ; Nation, J.A.

Author_Institution

Sch. of Electr. Eng., Cornell Univ., Ithaca, NY, USA

fYear

1993

fDate

17-20 May 1993

Firstpage

2653

Abstract

We investigate theoretically the interaction of an electron beam with a TM mode in the presence of a longitudinal wiggler. The electron motion is longitudinal and radial therefore adequate for interaction with the electric field components of the mode. There are two facts which make this device unique: firstly, the equations which describe its dynamics are practically identical to the equations of the traveling wave tube (TWT) rather than the free electron laser (FEL) thus its sensitivity to beam quality is significantly lower, and the efficiency in the absence of tapering is higher. Secondly the interaction is possible only with an annular rather than a pencil beam as in a regular FEL-therefore the amount of current it is possible to inject is larger. Optimal operation at 20.56 GHz is examined

Keywords

free electron lasers; laser theory; wigglers; 20.56 GHz; TM mode; annular beam; beam quality; electron motion; free electron laser; longitudinal wiggler; pencil beam; traveling wave tube; Acceleration; Difference equations; Electromagnetic waveguides; Electron beams; Free electron lasers; Laboratories; Laser beams; Laser modes; Plasmas; Undulators;

fLanguage

English

Publisher

ieee

Conference_Titel

Particle Accelerator Conference, 1993., Proceedings of the 1993

Conference_Location

Washington, DC

Print_ISBN

0-7803-1203-1

Type

conf

DOI

10.1109/PAC.1993.309417

Filename

309417