Abstracts Brochure - CERN

WEPCH018
WEPCH020
WEPCH021
28-Jun-06 16:00 - 18:00 WEPCH — Poster Session
Comparisons with alternative programmes confirm the results obtained. The work will enable us to investigate the
behaviour of the machine in a theoretical model during the forthcoming operating.
Finite Elements Calculations of the Lattice and Ring Acceptance of the Heidelberg CSR
A new Cryogenic Storage Ring (CSR) is cur-
H. Fadil, M. Grieser, A. Wolf, R. von Hahn (MPI-K)
rently being designed at MPI-K in Heidelberg.
This electrostatic ring, which will store
ions in the 20∼300 keV energy range (E/Q), has a total circumference of 35.2 m and a straight section length of 2.8
m. The ring design was at first carried out with the optics code MAD in the first order approximation. Further
investigation of the optics was performed with the finite elements electrostatic code TOSCA. The individual elements
of the CSR (deflectors and quadrupoles) were calculated then a model of the entire ring was simulated with successful
storage (tracking) of 20keV protons for many turns. The lattice parameters thus obtained were compared with the
MAD results and show good agreement. The dynamic ring acceptance was also calculated for the standard operating
point.
Extending the Linear Least Squares Problem for Orbit Correction in Circular Accelerators
A method for extending the linear least
C. Scafuri, F. Iazzourene (ELETTRA)
squares problem applicable for correcting the
orbit of circular accelerators is proposed. The
method is based on the definition of a suitable cost function which weighs both orbit deviations and the correction
effort, that is steerer kicks. The paper presents the full derivation of the formulas and the results of simulations. The
application of this method for the Global Orbit Feedback system of the ELETTRA storage ring is being evaluated.
Generalized Twiss Coefficients Including Transverse Coupling and E-beam Growth
F. Ciocci, G. Dattoli (ENEA C.R. Frascati) M. Migliorati (Rome University
La Sapienza)
278
We use a generalization of the Twiss coefficients
to the fully transverse coupled case.
We show that the formalism is particularly
useful to treat problems involving the beam
optics of electrons propagating in undulators or solenoids. The method allows the treatment in analytical terms, we
generalize the method including the effect of spatial charges and higher order multi-polar terms. The method is then
applied to a specific example relevant to e-beam emittance dilution in solenoid and exotic undulators.