Abstracts Brochure - CERN

WEPCH105
WEPCH106
WEPCH107
28-Jun-06 16:00 - 18:00 WEPCH — Poster Session
transverse separation in RHIC at injection, and comparisons with simulations. We present a design for a long-range
wire compensator in RHIC.
Semi-Lagrangian Beam Dynamics Technique for the Simulation of the Propagation of Intense
Charged Particle Beams in 2D Channels
J.-L. Lemaire, D. Guilhem (CEA) A.M. Mouton, E. Sonnendrucker
(IRMA)
302
We have developed new methods based on
the direct resolution of the Vlasov equation
on a grid of phase space preferable to PIC
methods when one is interested in accurate
simulations of high intensity beams especially in the low density part of phase space. Dynamical behaviors of
intense charged particle beams propagating through continuous or periodic systems have been investigated using a
fully self consistent Vlasov method in presence of conducting wall. Now, the simulation code deals either with an
axisymetric geometry or a cartesian geometry. Diagnostics which are implemented in the code enable easy display
of halo generation caused by different sources that are driven by nonlinear forces, mismatching, non-stationary beam
distributions and its development along the focussing structure. Comparisons with PIC technique simulations are
also presented.
Electron Transport in AIRIX Using the TRAJENV Code
In the framework of the AIRIX program, the
O. Mouton (CEA)
electron beam propagation between the injector
and the X-conversion target is routinely
simulated with the 2D TRAJENV code. We describe the physical models implemented in the code for a intense stationary
beam. We present both the modeling of applied electromagnetic forces in induction cells and self generated
ones. To avoid the cell damage due to target debris generated by the electron beam impact, a thin debris shield has
been tested upstream the X-ray converter. Such a thin foil located in the beam pass, is taken into account in TRAJENV.
We describe the modeling and the influence of the foil on the beam.
Contributors to AIRIX Focal Spot Size
N. Pichoff, M. Caron, F. Cartier, D.C. Collignon, A. Compant La
Fontaine, L.H. Hourdin, M. Mouillet, D.P. Paradis (CEA)
High intensity electron beam focusing is a
key issue for the successful development
of flash radiography at hydro test facilities.
AIRIX is a 2 kA, 19 MeV, 60 ns, single shot
linear accelerator that produces X-rays from the interaction between relativistic electrons and a Tantalum solid target
(Ta). A simulation tool has been developed to model the pulsed-beam dynamics through the accelerator from the
cathode to the target. This simulator has allowed to estimate the contribution to the beam size on the target (focal
spot) of beam emittance, pulse energy dispersion, pulse rising and falling fronts and the ion production on the target.
The quantified contributions of these phenomena are reviewed here.