Abstracts Brochure - CERN

MOPCH089
MOPCH090
MOPCH091
26-Jun-06 16:00 - 18:00 MOPCH — Poster Session
Filter’ in order to be cooled down to the appropriate energy according to their horizontal positions**. In parallel with
the computer simulation, construction of the laser cooling system with use of ring dye laser accompanied with the
second harmonics generator is now underway.
*H. Fadil et al. Nucl. Instr. & Meth. in Phys. Res. A517, 1-8 (2004).**A. Noda and M. Grieser, Beam Science and
Technology, 9, 12-15 (2005).
Basic Aspects of the SIS100 Correction System Design
V.A. Mikhaylov, A.V. Alfeev, A.V. Butenko, A.V. Eliseev, H.G.
Khodzhibagiyan, A.D. Kovalenko, O.S. Kozlov, V.V. Seleznev, A.Y.
Starikov, V. Volkov (JINR) E. Fischer, G. Moritz, P.J. Spiller, J. Stadlmann
(GSI)
72
The basic concept and the main design features
of the superconducting SIS100 correction
system are presented. The system comprises
84 steerer magnets consisting of two
orthogonal dipole windings each for correction
of the beam close orbit in vertical and
horizontal planes, 48 normal sextupole windings connected in two families with opposite polarities for chromaticity
correction and 12 units containing skew quadrupoles, normal and skew sextupoles and octupoles as well. The
correction system should operate in a pulse mode corresponding to the accelerator cycle, i.e., up to 1 Hz. The main
magnetic, geometrical and electrical parameters of the corrector magnets were specified. They are based on the beam
dynamic analysis within the frames of the DF-type SIS100 lattice at different betatron tune numbers and tolerable
alignment and manufacturing errors of the main lattice dipole and quadrupole magnets. The problem of reasonable
unification of the corrector modules is discussed also, including their geometrical sizes, maximum supply current
and cooling at 4.5 K. The concept of the SIS100 corrector magnets is based on the pulsed correctors designed for the
Nuclotron.
ITEP-TWAC Status Report
Three years of successful operation the ITEP-
N.N. Alexeev, D.G. Koshkarev, B.Y. Sharkov (ITEP)
TWAC facility delivers proton and ion beams
in several modes of acceleration and accumulation
of by using the multiple charge exchange injection technique*. Substantial progress is achieved in output ion
beam current intensity of the linear injector I3, in intensity of the buster synchrotron UK, in efficiency increasing of ion
beam stacking and longitudinal compression in the storage ring U10. The machine status analysis and current results
of activities aiming at subsequent improvement of beam parameters for extending beam technology applications are
presented.
*N. Alexeev et al. Laser and Particle Beams (2002) V 20, N3, 385-392.
An Alternative Nonlinear Collimation System for the LHC
J. Resta, R.W. Assmann, S. Redaelli, J. Resta, G. Robert-Demolaize,
D. Schulte, F. Zimmermann (CERN) A. Faus-Golfe (IFIC)
The optics design of an alternative nonlinear
collimation system for the LHC is presented.
We discuss an optics scheme based on a single
spoiler located in between a pair of skew
sextupoles for betatron collimation. The nonlinear system allows opening up the collimator gaps and, thereby reduces
the collimator impedance, which presently limits the LHC beam intensity. After placing secondary absorbers at