Abstracts Brochure - CERN

TUPLS — Poster Session 27-Jun-06 16:00 - 18:00
Estimation of Decay Losses and Dynamic Vacuum for the Beta-beam Accelerator Chain
The beta-beam is based on the acceleration
and storage of radioactive ions. Due to the
large number of ions required and their relatively
short lifetime, beam losses are a major
M. Benedikt, A. Fabich, E. Mahner (CERN) M. Kirk, C. Omet, P.J.
Spiller (GSI)
concern. This paper estimates the decay losses for the part of the accelerator chain comprising the CERN PS and
SPS machines. For illustration purposes, the power deposition in these accelerators is compared to that expected for
nominal CNGS proton operation. The beam losses induced vacuum dynamics is simulated and the consequences for
machine operation are discussed.
Stacking Simulations in the Beta-beam Decay Ring
The so-called beta-beam concept for accelerator-driven
neutrino experiments envisages S. Hancock (CERN) A. Chance (CEA)
the production of a pure beam of electron
neutrinos (or their antiparticles) through the beta-decay of radioactive ions circulating in a high-energy storage ring.
An unprecedented number of ions must be collected in the decay ring and maintained in a few short bunches.
Stacking is unavoidable to match the available source rates with this demand. A new stacking method makes use of
off-momentum injection into the decay ring to approach the circulating beam without requiring ultra-fast injection
elements, rotation in the longitudinal plane to bring the fresh bunches onto the central orbit and asymmetric merging
to transport these ions into the centre of the large stack. Simulation results are presented for the complete repetitive
stacking process for two candidate ion species of significantly different charge-to-mass ratio.
Recent Gain in Polarized Beam Intensities for the Cooler Synchrotron COSY/Juelich
Since January 1996, the cyclotron JULIC operates
as the injector of H(-) or D(-) beams R. Gebel, O. Felden, R. Maier, P. von Rossen (FZJ)
for the cooler synchrotron COSY at the IKP
of the Forschungszentrum Juelich. Routinely about 8 microA of unpolarized or 1 microA of polarized H(-) ions are
delivered for charge-exchange injection into COSY. A polarization in excess of 90 % was measured for protons inside
the synchrotron COSY. Additionally, polarized and unpolarized D(-) ions have been delivered to experiments. A sequence
of up to eight different polarization states for deuterons has been provided for experiments. By advancing the
components of the polarized ion the number of polarized particles for injection into the cyclotron has been increased
by a factor of three to 5,5x10 12 protons, delivered in a 20 ms pulse with a repetition rate of 2 seconds. This report
sums up the characteristics of the ion sources and the cyclotron in their present mode of operation and describes
the achievements towards higher beam intensities as well as for providing unpolarized and polarized H(-) and D(-)
beams with high reliability.
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TUPLS084
TUPLS085
TUPLS087