Abstracts Brochure - CERN

THPLS102
THPLS103
THPLS104
29-Jun-06 16:00 - 18:00 THPLS — Poster Session
are from 2000 A and 3000 A for Booster injection and extraction, to 5100 A for SR injection. This contribution will
describe the magnets and the pulsed power supplies design. The electrical and magnetic measurement results will be
presented, with a specific emphasis on the improvements needed to reduce the level of leakage field of the SR septum
magnet.
Optimisation of the Coating Thickness on the Ceramic Chamber of the SOLEIL SR Kicker
Magnets
P. Lebasque, L. Cassinari, J.P. Daguerre, C. Herbeaux, M.-P. Level,
C. Mariette, R. Nagaoka (SOLEIL)
476
The SOLEIL storage ring injection section integrates
four matched injection kicker magnets,
two diagnostics kicker magnets and a
beam shaker, which need ceramic vacuum
chambers with an inner titanium coating. For each utilisation (according with its field amplitude and its time or
frequency domain), the coating thickness has been evaluated from the different points of view: field attenuation, beam
deposited power, magnet excitation deposited power, and cooling efficiency. So we could determine the different
coating thicknesses and tolerances needed according to the different magnetic field shapes. The realised ceramic
chambers have adequate coating resistances, with in particular a low non-uniformity among the matched injection
kicker magnets chambers.
Investigations of the Longitudinal Phase Space at PITZ
J.R. Roensch, J. Rossbach (Uni HH) K. Abrahamyan, G. Asova, J.W.
Baehr, H.-J. Grabosch, O. Kalekin, S. Khodyachykh, S.A. Korepanov,
M. Krasilnikov, A. Oppelt, B. Petrosyan, S. Riemann, L. Staykov, F.
Stephan (DESY Zeuthen) D. Lipka, R. Richter (BESSY GmbH)
The correlation between the positions of the
particles in the bunch and their longitudinal
momenta has to be analysed in order to optimize
photo injectors for Free-Electron Lasers
(FELs). Longitudinal phase space measurements
at the upgraded PITZ facility* will be
presented in this paper. Measurements of the complete longitudinal phase space and its projections behind the gun
are compared with simulations. Momentum measurements after a booster cavity will be discussed.
*A.Oppelt et al. "Status and first results from the upgraded PITZ facility", FEL Conf. 2005.
Optimization Studies of the FERMI@ELETTRA Photoinjector
In the framework of the FERMI@ELETTRA
G. Penco, M. Trovo (ELETTRA) W. Graves (MIT) S.M. Lidia (LBNL) project the electron beam characteristics
strongly depend from the two operating
modes: FEL1 (100nm-40nm) with a photon pulse around 100fs and FEL2 (40nm-10nm) with a long photon pulse
(∼1ps) having a high resolution spectral bandwidth. We present the multi-particles tracking code results concerning
the photoinjector, which includes the RF gun and the first two accelerating sections, describing two possible electron
bunch lengths, satisfying the two FEL operation modes. The injector optimization relative to the two options, aimed
to produce a very low projected emittance (around 1 mm mrad) with a uniform behavior of the slice parameters
(emittance and energy spread) along the bunch, is described in this paper. Moreover sensitivity studies, time and
energy jitters estimations are presented for both cases.