Title :
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
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;
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
DOI :
10.1109/PAC.1993.309073
