Abstracts Brochure - CERN

WEPCH118
WEPCH119
WEPCH120
28-Jun-06 16:00 - 18:00 WEPCH — Poster Session
LORASR Code Development
R. Tiede, G. Clemente, H. Podlech, U. Ratzinger, A.C. Sauer (IAP)
S. Minaev (ITEP)
306
LORASR is specialized on the beam dynamics
design of Separate Function DTL’s
based on the ’Combined 0 Degree Structure
(KONUS)’ beam dynamics concept. The
code has been used for the beam dynamics design of several linacs already in operation (GSI-HLI, GSI-HSI, CERN
Linac 3, TRIUMF ISAC-I) or scheduled for the near future (Heidelberg Therapy Injector, GSI Proton Linac). Recent
code development was focused on the implementation of a new PIC 3D FFT space charge routine, facilitating timeefficient
simulations with up to 1 million macro particles routinely, as well as of tools for error study and loss profile
investigations. The LORASR code was successfully validated within the European HIPPI Project activities: It is the
Poisson solver benchmarking and the GSI UNILAC Alvarez section tracking comparison programme. The error study
tools are a stringent necessity for the design of future high intensity linacs. The new LORASR release will have a
strong impact on the design of the GSI FAIR Facility Proton Linac, as well as the transmission investigations on the
IFMIF Accelerator. This paper presents the status of the LORASR code development and the benchmarking results.
Beam Performance with Internal Targets in the High-energy Storage Ring (HESR)
A. Lehrach, R. Maier, D. Prasuhn (FZJ) O. Boine-Frankenheim, R.W.
Hasse (GSI) F. Hinterberger (Universität Bonn, Helmholtz-Institut
für Strahlen- und Kernphysik)
The High-energy Storage Ring of the future
International Facility for Antiproton and
Ion Research (FAIR) at GSI in Darmstadt is
planned as an antiproton synchrotron storage
ring in the momentum range of 1.5 to 15
GeV/c. An important feature of HESR is the combination of phase space cooled beams and dense internal targets
(e.g., pellet targets), which results in demanding beam parameter requirements for two operation modes: high luminosity
mode with peak luminosities of up to 2·10 32 cm-2 s-1, and high resolution mode with a momentum spread
down to 10-5, respectively. The beam cooling equilibrium and beam loss with internal target interaction is analyzed.
Rate equations are used to predict the rms equilibrium beam parameters. The cooling and intra-beam scattering
rate coefficients are obtained from simplified models. Energy loss straggling in the target and the associated beam
loss are analyzed analytically assuming a thin target. A longitudinal kinetic simulation code is used to study the
evolution of the momentum distribution in coasting and bunched beam. The analytic expressions for the target
induced momentum tail are found in good agreement with the simulation results.
*A. Lehrach et al. Beam Performance and Luminosity Limitations in the High-Energy Storage Ring (HESR), Nuclear
Inst. and Methods in Physics Research, A44704 (2006).
Simulation of 3D Space-charge Fields of Bunches in a Beam Pipe
A. Markovik, G. Pöplau, U. van Rienen (Rostock University, Faculty
of Computer Science and Electrical Engineering) K. Floettmann
(DESY)
Recent applications in accelerator design require
precise 3D calculations of space-charge
fields of bunches of charged particles additionally
taking into account the shape of the
beam pipe. An actual problem of this kind is
the simulation of e-clouds in damping rings. In this paper a simulation tool for 3D space-charge fields is presented
where a beam pipe with an arbitrary elliptical shape is assumed. The discretization of the Poisson equation by
the method of finite differences on a Cartesian grid is performed having the space charge field solved only in the