Abstracts Brochure - CERN

WEPCH144
WEPCH145
WEPCH146
28-Jun-06 16:00 - 18:00 WEPCH — Poster Session
proposed. The accelerator beam track, starting from the electron source and up to output devices is considered as a
single multicomponent target consisting of the layers of different materials. The thickness of each layer is measured
in the generalized units of the "stopping length". Using the method of simulation based on the PENELOPE/2001
system the characteristics of the mixed e,gamma-radiation field (energy yield of electrons, photons and their ratio) as
function of the stopping length for actual or anticipated version of output equipment can be calculated. To illustrate
the method, the parameters of the beam path of the NSC KIPT Linacs used as e,X-facilities was analyzed.
CSR Studies of a Benchmark Bunch Compressor
We study the influence of CSR on particle
G. Bassi, J.A. Ellison, K.A. Heinemann (UNM)
bunches traveling on arbitrary planar orbits
between parallel conducting plates with a
fixed "vertical" charge distribution. Our goal is a numerical solution of the 2 degree-of-freedom Vlasov-Maxwell
equations. This provides simulations with lower numerical noise than the macroparticle method and allows the
study of emittance degradation and microbunching. As reported*, we calculate the fields excited by the bunch in the
lab frame using a new formula that leads to a simplification. The Vlasov equation is integrated in the beam frame
interaction picture using the method of local characteristics. The transformation between traditional beam frame and
lab frame coordinates is carefully treated. Here we report on our implementation of the algorithm in the context of a
chicane bunch compressor**, where the strong correlation between phase space variables requires an adaptive grid.
In particular, we present a complete analysis (moments + reduced densities) of the bunch evolution under the fields
produced by the unperturbed bunch density. Finally, our progress on the fully self-consistent case is discussed.
* Vlasov treatment of coherent synchrotron radiation from arbitrary planar orbits, Nucl. Instr. Meth. Phys. Res. A,
in press.** ICFA Beam Dynamics Mini-Workshop on CSR, Berlin-Zeuthen, 2002. See http://www.desy.de/csr.
Particle Tracking and Simulation on the .NET Framework
Particle tracking and simulation studies are
H. Nishimura (LBNL)
becoming complex. In addition to the sophisticated
graphics, interactive scripting is
becoming popular. A compatibility with the control system requires network and database capabilities. It is not a
trivial task to fulfill various requirements without sacrificing the runtime performance. We evaluate the use of .NET
to solve this issue by converting a C++ code Goemon* that is an object-oriented version of Tracy developed at ALS.
The portability to other platforms will be mentioned in terms of Mono.
*H. Nishimura, PAC’01, Chicago, July 2001, p.3066.
Intrabeam Scattering Studies for the ILC Damping Rings Using a New Matlab Code
A new code to calculate the effects of in-
I. Reichel, A. Wolski (LBNL)
trabeam scattering (IBS)has been developed
in Matlab based on the approximation suggested
by K. Bane*. It interfaces with the Accelerator Toolbox** but can also read in lattice functions from other codes.
The code has been benchmarked against results from other codes for the ATF*** that use this approximation or do
the calculation in a different way. The new code has been used to calculate the emittance growth due to intrabeam
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