Abstracts Brochure - CERN

THPCH007
THPCH008
THPCH009
THPCH010
29-Jun-06 16:00 - 18:00 THPCH — Poster Session
Development of a High Current Proton Linac for FRANZ
The FRANZ Facility, a planned worldwide
C. Zhang, A. Schempp (IAP)
unique pulsed neutron source, will be built
at Frankfurt University. A single RFQ or an
RFQ-IH combination working at 175MHz will be used to accelerate a 200mA proton beam to the energy which can
meet the demands of required neutron production. The beam dynamics study has been performed to design a flexible,
short-structure and low-beam-loss RFQ. The design results and relative analyses are presented.
The Non-linear Space Charge Field Compensation of the Electron Beam in the High Energy
Storage Ring of FAIR
In the High Energy Storage Ring, a part of the
A.N. Chechenin, R. Maier, Y. Senichev (FZJ)
FAIR project at GSI in Darmstadt, the internal
target is used. To compensate the interaction
of the beam with the target, the electron beam cooling is needed. However, together with the cooling, the non-linear
space charge field of electron beam modifies the dynamic aperture. We investigate the possible schemes of this effect
compensation using the multi-pole correctors on the HESR.
Ab Initio Liquid Hydrogen Muon Cooling Simulations with ELMS in ICOOL
W.W.M. Allison, J. Cobb, S. Holmes (OXFORDphysics) R.C. Fernow,
R. Palmer (BNL)
388
Muon cooling depends on the differential
cross section for energy loss and scattering
of muons. We have calculated this cross section
for liquid H2 from first principles and
atomic data, avoiding traditional assumptions. Thence, 2-D probability maps of energy loss and scattering in mm
thicknesses are derived by folding and stored in a database. Large first-order correlations between energy loss and
scattering are found for H2, which are absent in other simulations. This code is named ELMS, Energy Loss &
Multiple Scattering. Single particle trajectories may then be tracked by Monte Carlo sampling from this database.
This processor has been inserted into the cooling code ICOOL. Significant improvements in 6-D muon cooling are
predicted compared with previous predictions based on GEANT. This is examined in various geometries. The large
correlation effect is shown to have only a small effect on cooling. The scattering observed for liquid H2 in the MUSCAT
experiment is reported to be in good agreement at large angles with the ELMS prediction, but in less good agreement
with GEANT simulation.
Electron Beam-laser Interaction near the Cathode in a High Brightness Photoinjector
M. Ferrario, G. Gatti (INFN/LNF) J.B. Rosenzweig (UCLA) L. Serafini
(INFN-Milano)
The production of high charge short bunches
in a high brightness photoinjector requires
laser pulses driving the cathode with GW
range peak power on a mm spot size. The
resulting transverse electric field experienced by the electron beam near the cathode is of the order of 200-500 MV/
m, well in excess of a typical RF accelerating field of 50-100 MV/m. We present here an analytical and computational
study of the resultant beam dynamics. Simulations including the electron beam-laser interaction have been performed