Abstracts Brochure - CERN

TUPLS — Poster Session 27-Jun-06 16:00 - 18:00
of the thermoelastic displacement potential for the equivalent isothermal two-dimensional stress problem. Finally,
the contribution of dynamic stresses due to longitudinal and bending stress waves is determined by means of the
modal summation method. This method can be effectively applied to any solid having cylindrical shape, made out
of isotropic elastic material.
EURISOL Target Stations Operation and Implications for its Proton Driver Beam
Targets for the next generation radioactive
ion beam (RIB) facilities (RIA, EURISOL) will E. Noah, F. Gerigk, J. Lettry, M. Lindroos, T. Stora (CERN)
be subjected to energy deposition levels that
call for a specific design of the target and ion source assembly to dissipate the deposited heat and to extract and
ionize isotopes of interest efficiently. EURISOL, the next generation European RIB facility, plans to operate four target
stations in parallel, three 100 kW direct targets and one 5 MW spallation neutron source with a GeV proton linac
driver. The nature of the beam sharing has yet to be defined because in practice it will have a direct impact on target
design, operation and lifetime. Splitting the beam in time implies that each target would be subjected to a pulsed
beam, whose pulse width and repetition cycle have to be optimized in view of the RIB production. The 100 kW
targets are expected to have a goal lifetime of three weeks. Target operation from the moment it is installed on a target
station until its exhaustion involves several phases during which the incident proton beam intensity will vary. This
paper discusses challenges for high power targetry at EURISOL, with an emphasis on requirements for the proton
linac parameters.
Comparison between Measured and Simulated Beam Loss Patterns in the SPS
A prototype of an LHC collimator has been
tested with proton beams at the CERN SPS.
The interaction of the circulating proton
beam with the carbon collimator jaws gen-
S. Redaelli, G. Arduini, R.W. Assmann, G. Robert-Demolaize
(CERN)
erated showers that were lost in the downstream SPS aperture. The measured beam loss patterns are compared
in detail with the results of dedicated loss simulations. The simulation package includes (1) a 6D particle tracking
through the SPS lattice; (2) the scattering interaction of protons with the collimator jaw material; (3) the time-dependent
displacement of the collimator jaws with respect to the beam orbit; (4) a detailed aperture model of the full
SPS ring. It is shown that the simulation tools can reliably predict the measured location of losses. This provides an
important assessment of the simulation tools in view of the LHC beam loss studies.
LHC Collimation Efficiency as a Function of Collimator Jaw Flatness
The performance of the LHC collimation system
depends critically on the flatness of the
collimator jaws. Detailed simulation tools
have been setup to study the dependence of
S. Redaelli, R.W. Assmann, C.B. Bracco, G. Robert-Demolaize
(CERN)
cleaning efficiency on the jaw flatness. The expected degradation of performance is quantified as a function of jaw
deformation, both for systematic deformation of all jaws and for deformations of single jaws. Production tolerances on
jaw flatness are discussedand secondary collimator locations are classified in terms of sensitivity to jaw deformations.
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