Abstracts Brochure - CERN

MOPCH — Poster Session 26-Jun-06 16:00 - 18:00
FERMI @ Elettra: Conceptual Design for a Seeded Harmonic Cascade FEL for EUV and
Soft X-rays
We present a summary of the conceptual design
for the FERMI FEL project funded for
construction at the Sincrotrone Trieste, Italy.
The project will be the first user facility based
on seeded harmonic cascade FEL’s, providing
controlled, high peak-power pulses, and
complementing the storage ring light source
at Sincrotrone Trieste. The facility is to be driven
by electron beam from a high-brightness
C.J. Bocchetta, E. Allaria, D. Bulfone, P. Craievich, G. D’Auria, M.B.
Danailov, G. De Ninno, S. Di Mitri, B. Diviacco, M. Ferianis, A. Gambitta,
A. Gomezel, E. Karantzoulis, G. Penco, M. Trovo (ELETTRA)
J.N. Corlett, W.M. Fawley, S.M. Lidia, G. Penn, A. Ratti, J.W. Staples,
R.B. Wilcox, A. Zholents (LBNL) M. Cornacchia, P. Emma (SLAC)
W. Graves, F.O. Ilday, F.X. Kaertner, D. Wang (MIT) F. Parmigiani
(Università Cattolica-Brescia)
rf photocathode gun, and using the existing 1.2 GeV S-band linac. Designed for an initial complement of two FEL’s,
providing tunable output over a range from ∼100 nm to ∼10 nm, FERMI will allow control of pulse duration from less
than 100 fs to approximately1 ps, and with polarization control from APPLE undulator radiators. Seeded by tunable
UV lasers, FEL-1 is a single-stage of harmonic generation to operate over ∼100 nm to ∼40 nm, and FEL-2 a two-stage
cascade operating from ∼40 nm to ∼10 nm or shorter wavelength. Photon output is spatially and temporally coherent,
with peak power in the 100’s MW to GW range. We have designed FEL-2 to minimize the output radiation spectral
bandwidth. Major systems and overal facility layout are described, and key performance parameters summarized.
Time-resolved "Start-to-end" FEL Simulation Results for the FERMI @ Elettra Project
The FERMI FEL project* is the first user
facility based on seeded harmonic cascade
FEL’s, providing controlled, high peakpower
pulses, and complementing the stor-
G. De Ninno, E. Allaria (ELETTRA) W.M. Fawley, G. Penn (LBNL)
W. Graves (MIT)
age ring light source at Sincrotrone Trieste. FERMI will initial comprise two FEL’s, providing tunable output over a
wavelength range from ∼100- to 40-nm (FEL-1) and ∼40-to-10-nm (FEL-2) with control of both polarization and temporal
pulse duration. We present results concerning the predicted FEL output based the expected 6D electron beam
phase space at the undulator entrance as determined from detailed "start-to-end" simulations**. Both the GENESIS
and GINGER codes were applied to this study. We discuss the expected transverse and longitudinal coherence, and
also the predicted sensitivity to both undulator errors and accelerator jitter.
*C. J. Bocchetta et al. “FERMI @ Elettra – Conceptual Design for a Seeded Harmonic Cascade FEL for EUV and Soft
X-rays”, this conference. **S. DiMitri et al. “Start to End Simulations of FERMI@ELETTRA”, this conference.
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