Abstracts Brochure - CERN

WEPCH — Poster Session 28-Jun-06 16:00 - 18:00
FFAG Computation Tools
Efficient computational tools, based on linear
beam optis techniques and on powerful ray- F. Meot (CEA) J.F. Fourrier (LPSC) F. Lemuet (CERN)
tracing methods, are being developped for
the the design of, and 6-D transmission simulations in, the various known types of fixed field alternating gradient
(FFAG) accelerators∼: scaling, non-scaling, isochronous, and the acceleration methods therein∼: gutter, isochronous,
synchrotron. The present advancement of these works is described, and illustrated through their application to
rapid acceleration in the neutrino factory (NuFact) muon acceletors and their electron model EMMA, and to 6-D
transmission simulations in scaling FFAGs.
Comprehensive Benchmark of Electromagnetical 3D Codes in Time and Frequency Domain
A comprehensive benchmark of todays most
powerful numerical 3D Eigenmode and Time
Domain Solvers has been performed using
the input geometry of a HOM-damped cavity
V. Serriere, N. Guillotin, J. Jacob (ESRF) F. Marhauser, E. Weihreter
(BESSY GmbH)
and a highly lossy waveguide load developed at BESSY. The paper details the simulations results together with existing
experimental data.
Calculation of Wake Potentials in General 3D Structures
The wake potential is defined as an integration
along an axis of a structure. It includes H. Henke (TET) W. Bruns (CERN)
the infinitely long beam pipe regions and in
case of numerical evaluation leads to pipe wake artefacts. If the structure is cavity like one can position the integration
path on the pipe wall and only the integration over the cavity gap remains. In case of axis-symmetric protruding
structures it was proposed by O. Napoly et al. to deform the path such that the integration in the pipe regions is
again on the wall. The present paper generalizes this method of path deformation to 3D structures with incoming
and outgoing beam pipes. Its usefulness is verified with the code GdfidL and no artifacts were observed.
Time Domain Radiation of a Gaussian Charge Sheet Passing a Slit in a Conducting Screen
A semi-analytical method is proposed to calculate
in time-domain the radiation of a rela- M. Filtz, H. Henke (TET)
tivistic Gaussian charge sheet travelling parallel
to a slotted conducting screen. The method is based on transient line current elements as basis functions which
have a triangular time dependence. Making use of duality magnetic current elements are used in the slot region.
Radiation fields are shown and the transverse kick received by a test charge is given. The dual problem, the scattering
of the fields at a conducting strip, is also treated. The main purpose of the paper is to present an effective algorithm
which is easy to implement for computing and visualising plane scattering and diffraction problems in time domain.
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