The groove guide: a non-conventional interaction structure for microwave FEL experiments

Author

Arcioni, P. ; Bressan, M. ; Broggi, F. ; Conciauro, G. ; Pierini, P.

Author_Institution

Dept. of Electron., Pavia Univ., Italy

fYear

1993

fDate

17-20 May 1993

Firstpage

1569

Abstract

We discuss the use of a groove guide as the FEL interaction structure for the ELFA experiment: the groove guide confines the 100 GHz radiation and controls the slippage, permitting to investigate different FEL regimes. The groove guide is a laterally open structure: it supports a single guided mode even if its dimensions are large compared with the wavelength, as required in the experiment to accommodate the beam. Thus, differently from conventional oversized rectangular waveguides, the groove guide allows the beam to interact with a single mode, simplifying the design of the structure. The lateral openings ease the beam diagnostics as well, and overcome pumping problems

Keywords

free electron lasers; rectangular waveguides; ELFA experiment; FEL interaction structure; beam diagnostics; groove guide; laterally open structure; microwave FEL experiments; nonconventional interaction structure; oversized rectangular waveguides; pumping problems; single guided mode; slippage; Eigenvalues and eigenfunctions; Electromagnetic waveguides; Frequency; Laser excitation; Millimeter wave propagation; Rectangular waveguides; Steady-state; Strontium; Waveguide components; Waveguide discontinuities;

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.1993.309073

Filename

309073