Abstracts Brochure - CERN

WEPCH112
WEPCH113
WEPCH114
28-Jun-06 16:00 - 18:00 WEPCH — Poster Session
Database Extension for the Beam Dynamics Simulation Tool V-code
W. Ackermann, W.F.O. Müller, T. Weiland (TEMF) J. Enders, H.-D.
Gräf, A. Richter (TU Darmstadt)
304
The beam dynamics simulation tool V-Code
has been proved to be very useful in redesigning
the injector layout at the superconducting
linear accelerator in Darmstadt
(S-DALINAC). Modifications in the beam optics are necessary because a new source of polarized electrons should be
installed in addition to the existing thermionic gun. The calculations are performed with V-Code which is designed
to handle a large amount of individual beam line elements and can therefore be used for extensive accelerator studies.
The available database includes all the necessary components like solenoids, quadrupoles and rf cavities, but as a
result of their consecutive treatment overlapping external fields are not allowed. Due to geometrical restrictions in the
assembly of the new source a space-saving candidate of a quadrupole triplet violates this software-related condition
if it is regarded as three distinct quadrupoles. Consequently, a more general beam line element has to be created
which treats the lenses as a single unit without interference of their fields to attached cells. The indispensable data
base extension together with simulation results and implementation verifications will be presented.
Numerical Impedance Calculations for the GSI SIS-100/300 Kickers
Fast kicker modules represent a potential
B. Doliwa, H. De Gersem, T. Weiland (TEMF)
source for beam instabilities in the planned
Facility for Antiproton and Ion Research
(FAIR) at the Gesellschaft für Schwerionenforschung (GSI), Darmstadt. In particular, the more than fifty kicker
modules to be installed in the SIS-100 and SIS-300 synchrotrons are expected to have a considerable parasitic influence
on the high-current beam dynamics. Here we present our numerical investigations of the longitudinal and transverse
kicker coupling impedances using a specialized electromagnetic field software. Besides the coupling to the external
network, particular attention is paid to the question whether a resistively-coated ceramic beam pipe is able to reduce
coupling impedances and ferrite heating significantly.
On the Development of a Self-consistent Particle-in-cell (PIC) Code Using a Time-adaptive
Mesh Technique
For a large class of problems the self-consis-
S. Schnepp, E. Gjonaj, T. Weiland (TEMF)
tent simulation of charged particle beams in
linear accelerators is necessary. Especially, in
all low-energetic sections such as injectors the self-consistent interaction of particles and fields has to be taken into
account. Well-known programs like the MAFIA TS Modules typically use the Particle-in-cell (PIC) method for beam
dynamics simulations. Since they use a fixed computational grid which has to resolve the bunch adequately, they
suffer from enormous memory consumption. Therefore and especially in the 3D case, only rather short sections can
be simulated. A remedy to this limitation is the usage of a grid which refines itself in the vicinity of particles. For this
purpose, a new code called SMOVE based on a time-adaptive grid is being developed. First promising results will be
presented at the conference.