Abstracts Brochure - CERN

THPCH — Poster Session 29-Jun-06 16:00 - 18:00
An Efficient Formalism for Simulating Coherent Synchrotron Radiation
The ability to simulate coherent synchrotron
radiation (CSR) is of great interest since
CSR can severely limit the performance of
planned light sources that push the envelope
D. Sagan (Cornell University, Laboratory for Elementary-Particle
Physics)
with ever increasing bunch densities. To this end, the formalism of Saldin* is extended to work with both moderately
relativistic and ultra-relativistic beams. The formalism is also generalized to cover the case of an arbitrary
configuration of multiple bends.
*E. L. Saldin et al. Nucl. Instrum. Methods Phys. Res., Sect. A 398, 373 (1997).
Electron Cloud Self-consistent Simulations for the SNS Ring
The electron cloud dynamics is simulated
for the Spallation Neutron Source ring using
the self-consistent electron-cloud model for
long-bunched proton beams implemented in
A.P. Shishlo, S.M. Cousineau, V.V. Danilov, S. Henderson, J.A.
Holmes, M.A. Plum (ORNL)
the ORBIT code. These simulations feature simultaneous calculations of the dynamics of the proton bunch and of the
electron cloud, including electron multipacting using a realistic secondary emission surface model. The frequency
spectra and growth rates of the proton bunch transverse instability are studied as functions of the RF cavity voltage.
The effectiveness of an electron-cloud instability suppression system is also studied using an ORBIT model
of the real feedback system. SNS is a collaboration of six US National Laboratories: Argonne National Laboratory
(ANL), Brookhaven National Laboratory (BNL), Thomas Jefferson National Accelerator Facility (TJNAF), Los Alamos
National Laboratory (LANL), Lawrence Berkeley National Laboratory (LBNL), and Oak Ridge National Laboratory
(ORNL).
Parallel 3-D Space Charge Calculations in the Unified Accelerator Library
The paper presents the integration of the
SIMBAD space charge module in the UAL
framework. SIMBAD is a Particle-in-Cell
(PIC) code. Its 3-D parallel approach fea-
N.L. D’Imperio, A.U. Luccio, N. Malitsky (BNL) O. Boine-
Frankenheim (GSI)
tures an optimized load balancing scheme based on a genetic algorithm. The UAL framework enhances the SIMBAD
standalone version with the interactive ROOT-based analysis environment and an open catalog of accelerator algorithms.
The composite package addresses complex high intensity beam dynamics studies and has been developed as
a part of the FAIR SIS 100 project.
A Proposal for Experiment to Study a Possible Heavy-ion Cooling due to Intra-beam Scattering
in the AGS
Low emittance of not-fully-stripped
gold(Z=79) Au+77 Helium-like ion beams
from the AGS (Alternating Gradient Synchrotron)
could be attributed to the cooling
D. Trbojevic, L. Ahrens, M. Blaskiewicz, J.M. Brennan, W.W.
MacKay, G. Parzen, T. Roser (BNL)
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