Abstracts Brochure - CERN

MOPCH024
MOPCH025
MOPCH026
26-Jun-06 16:00 - 18:00 MOPCH — Poster Session
Future Seeding Experiments at SPARC
L. Giannessi, M.C. Carpanese, F. Ciocci, G. Dattoli, A. Dipace, A.
Doria, G.P. Gallerano, E. Giovenale, G. Parisi, M. Quattromini, A.
Renieri, C. Ronsivalle, E. Sabia, I.P. Spassovsky (ENEA C.R. Frascati)
D. Alesini, M.E. Biagini, R. Boni, M. Castellano, A. Drago, M.
Ferrario, V. Fusco, A. Gallo, A. Ghigo, M. Migliorati, L. Palumbo,
C. Sanelli, B. Spataro, C. Vaccarezza, C. Vicario (INFN/LNF) M.
Bougeard, B. Carré, M.-E. Couprie, D. Garzella, M. Labat, G. Lambert,
H. Merdji, P. Salieres (CEA) M. Mattioli (Università di Roma I
La Sapienza) P. Musumeci, M. Petrarca (INFN-Roma) M. Nisoli, S.
de Silvestri (Politecnico/Milano) L. P. Poletto, G. T. Tondello (Univ.
degli Studi di Padova) L. Serafini (INFN-Milano)
52
Sources based on High order Harmonics
Generated in gases (HHG) with high power
Ti:Sa lasers pulses represent promising candidates
as seed for FEL amplifiers for several
reasons, as spatial and temporal coherence,
wavelength tunability and spectral
range, which extends down to the nm wavelength
scale. This communication describes
the research work plan that is under implementation
at the SPARC FEL facility in
the framework of the EUROFEL programme.
The main goal of the collaboration is to study
and test the amplification and the FEL har-
monic generation process of an input seed signal obtained as higher order harmonics generated both in crystals (400
nm and 266 nm) and in gases (266 nm, 160 nm, 114 nm). The SPARC FEL can be configured to test several cascaded
FEL layouts that will be analysed in this contribution.
Laser Comb: Simulations of Pre-modulated E- Beams at the Photocathode at SPARC
M. Boscolo, M. Ferrario, C. Vaccarezza, C. Vicario (INFN/LNF)
I. Boscolo (Universita’ degli Studi di Milano) F. Castelli (Università
degli Studi di Milano) S. Cialdi (INFN-Milano) P. Musumeci (INFN-
Roma)
A density modulated beam at the photocathode
though the proper modulation of the
laser beam pulse does not change substantially
emittance and energy spread, properties
directly related to FEL. It has been
found that bunch density modulation is
transformed into energy modulation along the propagation through the injector*. There are some physical arguments
that suggest a possibility to use this modulation for the enhancement of the FEL process, or for the production
of plasma wakes. Preliminary beam dynamics studies have been carried on to explore the use of electron beam premodulation
at the cathode to adjust their longitudinal structure at the end of the beamline. Energy modulation at the
end of the beamline could eventually be turned into current modulation through a magnetic compressor with R56