Abstracts Brochure - CERN

TUPLS081
TUPLS082
TUPLS083
27-Jun-06 16:00 - 18:00 TUPLS — Poster Session
Flat Beams and Application to the Mass Separation of Radioactive Beams
The notion of flat beam is now well estab-
P. Bertrand (GANIL) J.-L. Biarrotte (IPN) D. Uriot (CEA)
lished and has been proven theoretically and
experimentally with applications for linear
colliders. In this paper, we propose a new and simple demonstration of the "flat beam theorem", and a possible
application in the frame of radioactive ion beams (RIB) production. It consists in using a magnetized multi-specie
heavy ion beam extracted from a high frequency ECR source, decoupling the transverse phase planes in such a way
to obtain a very small emittance in the horizontal one, and using a dipole to separate the isotopes. A design of such a
transport and separation line will be proposed and commented.
Frankfurt Neutron Source at the Stern-Gerlach-Zentrum (FRANZ)
About 40ns long proton pulses with an en-
L.P. Chau, U. Ratzinger (IAP)
ergy of 120keV and currents of up to 200mA
will be produced at the 150kV high current
injector with a rep.rate of up to 250kHz. The main acceleration will be done by a 175MHz-RFQ. After this section the
proton bunches will have an energy of about 1.7MeV. A 4-gap cavity will allow for an energy increase up to 2.2MeV.In
order to get 1ns short pulses at the Li-7-Target we propose a buncher-system of the Mobley-Type*, whereby periodic
deflection at one focus of a dipole-magnet guides the bunche train from the linac on different paths to the other focus,
where the n-production traget is located in the time focus.By 7Li(p,n)B·10 7 reactions low-energy neutron bunches
will be produced with an averaged integrated flux-density of 4*10 7 /(cm2 s) at a distance of 0.4m. The upper limit for
the neutron spectra will be 500keV. The main challange with respect to this buncher is the strong space charge action,
which has to be treated by careful particle simulations. FRANZ is among other duties well suited for (n,gamma)cross-sectional
measurements with astrophysical relevance**/***. It is characterised by high n-intensities and by its
pulse-structure.
*Phys. Rev. 88(2), 360-361 (1951). **Phys. Rev. C 71, 025803 (2005).***Phys. Rev. Lett. 94, 092504 (2005).
A Low Energy Accumulation Stage for a Beta-beam Facility
The EU supported EURISOL Design Study
M. Lindroos (CERN) A. Källberg, A. Simonsson (MSL)
encompasses a beta-beam facility for neutrino
physics. Intense electron (anti-)neutrino
beams are in such a machine generated through the decay of radioactive ions in a high energy storage ring. The
two main candidate isotopes for the generation of a neutrino and an anti-neutrino beam are 6He 2+ and 18Ne 10+ . The
intensities required are hard to reach, in particular for the neon case. A possible solution to increase the intensity is
to use an accumulator ring with an electron cooler. Critical parameters such as cooling times and current limitations
due to space charge and tune shifts are presently being optimized. We will in this presentation give an overview of
the low energy accumulation stage and review recent work on this option.
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