Abstracts Brochure - CERN

MOPCH019
MOPCH020
26-Jun-06 16:00 - 18:00 MOPCH — Poster Session
the storage ring and the microbunching becomes thermalized. As a consequence, a correct theoretical understanding
of the process requires a proper modelling of the turn-by-turn evolution of the electron-beam phase space, both inside
the undulators (where the FEL interaction takes place) and along the ring. To simulate this process we have coupled
an ad hoc modified version of the 3D numerical code Ginger (which models the FEL interaction) together with a linear
one-turn map (which propagates the electron beam along the ring). We present our results and draw a comparison
with previous simplified approaches. We also present the first benchmarking of experiments carried out with the
ELETTRA storage-ring FEL.
Baseline Design of the Linac Upgrade for Fermi
G. D’Auria, P. Craievich, M.M. Milloch (ELETTRA) L.R. Doolittle,
A. Ratti (LBNL)
50
The FERMI FEL requires a major upgrade of
the existing linac, which needs to be transformed
from being the injector for the ELET-
TRA light source, to becoming the source for
the FERMI FEL. In this work, we present the baseline design, including the integration of the 7 additional systems from
the LIL linac, and one X-band station as linearizers. We will present the new layout with the required modifications
and additions to the existing infrastructure to meet the more demanding needs of the system. Such modifications
include a new RF controller, improvements in the modulator stability and an upgrade to the average power capabilities
of the system to operate at 50 Hz. Test results from the characterization of the existing systems will be included, as
well as plans for future development.
Design and Optimization of the FERMI @ Elettra FEL Layout
G. De Ninno, E. Allaria, B. Diviacco (ELETTRA) W.M. Fawley, G.
Penn (LBNL) W. Graves (MIT)
The FERMI @ ELETTRA project at Sincotrone
Trieste will be comprised of two FEL’s, each
based on the principle of seeded harmonic
generation. The first undulator line, FEL-1,
will operate in the 40-100 nm wavelength range and will rely upon one stage of harmonic up-conversion. The second
undulator line, FEL-2, extends the output spectral domain to the 10 -40 nm wavelength range and will use two harmonic
stages operating as a cascade. We review the FEL studies that have led to the final design and present results of
numerical simulations with GENESIS and GINGER codes including those examining the effects of undulator errors
and shot-to-shot fluctuations in multiple input parameters.