Dispersion and gain investigation of a Cerenkov grating amplifier

Author

Mehrany, Khashayar ; Rashidian, Bizhan

Author_Institution

Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran

Volume

50

Issue

6

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

1562

Lastpage

1565

Abstract

The sheet electron beam propagation over a rectangular deep groove grating is investigated and the interaction between surface harmonic waves, which are evanescent above the grating surface, with a dilute sheet electron beam is analyzed. It is assumed that a strong axial magnetic field is applied to constrain the motion of electrons along the waveguide axis. Under these conditions, a complex dispersion equation is derived and analyzed by using Taylor expansion. This expansion results in an analytical formulation for the gain. Using the derived analytical formulation of the gain, the effects of beam thickness, beam-grating gap, and characteristics of grating on gain is investigated.

Keywords

Cherenkov radiation; diffraction gratings; dispersion (wave); slow wave structures; travelling wave amplifiers; Cerenkov grating amplifier; Taylor expansion; beam thickness; beam-grating gap; dispersion; gain; rectangular deep groove grating; sheet electron beam propagation; slow wave structures; strong axial magnetic field; surface harmonic waves; traveling wave amplifiers; waveguide axis; Electromagnetic fields; Electromagnetic waveguides; Electron beams; Geometry; Gratings; Magnetic analysis; Magnetic fields; Maxwell equations; Space charge; Surface waves;

fLanguage

English

Journal_Title

Electron Devices, IEEE Transactions on

Publisher

ieee

ISSN

0018-9383

Type

jour

DOI

10.1109/TED.2003.813343

Filename

1213836