CERN Accelerating science

Article
Title	Electron-Beam Stabilization for the European Storage-Ring Free-Electron Laser at Elettra
Author(s)	Trovò, Mauro ; Bulfone, Daniele ; Danailov, M B ; De Ninno, G ; Diviacco, Bruno ; Forchi, V ; Lonza, Marco
Affiliation	(Elettra, Basovizza, Trieste ENEA C.R. Frascati, Frascati - Roma)
Publication	2004
In:	26th International Free Electron Laser Conference and 11th FEL User Workshop 2004, Trieste, Italy, 29 Aug - 3 Sep 2004, pp.e-proc. THPOS09
Subject category	Accelerators and Storage Rings
Abstract	The temporal structure of the storage-ring free-electron laser at Elettra shows high sensitivity to electron-beam instabilities. In fact, even small beam orbit oscillations (of the order of few microns) may perturb the FEL dynamics and periodically switch off the laser. In order to improve the FEL operation and performance, a longitudinal multi-bunch feedback and a local orbit feedback have been activated. This paper reports on the beneficial effect of these feedback systems. Plans for a future "slow" longitudinal feedback are also briefly described.