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Abstracts Brochure - CERN

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TUPLS — Poster Session 27-Jun-06 16:00 - 18:00<br />

Estimation of Decay Losses and Dynamic Vacuum for the Beta-beam Accelerator Chain<br />

The beta-beam is based on the acceleration<br />

and storage of radioactive ions. Due to the<br />

large number of ions required and their relatively<br />

short lifetime, beam losses are a major<br />

M. Benedikt, A. Fabich, E. Mahner (<strong>CERN</strong>) M. Kirk, C. Omet, P.J.<br />

Spiller (GSI)<br />

concern. This paper estimates the decay losses for the part of the accelerator chain comprising the <strong>CERN</strong> PS and<br />

SPS machines. For illustration purposes, the power deposition in these accelerators is compared to that expected for<br />

nominal CNGS proton operation. The beam losses induced vacuum dynamics is simulated and the consequences for<br />

machine operation are discussed.<br />

Stacking Simulations in the Beta-beam Decay Ring<br />

The so-called beta-beam concept for accelerator-driven<br />

neutrino experiments envisages S. Hancock (<strong>CERN</strong>) A. Chance (CEA)<br />

the production of a pure beam of electron<br />

neutrinos (or their antiparticles) through the beta-decay of radioactive ions circulating in a high-energy storage ring.<br />

An unprecedented number of ions must be collected in the decay ring and maintained in a few short bunches.<br />

Stacking is unavoidable to match the available source rates with this demand. A new stacking method makes use of<br />

off-momentum injection into the decay ring to approach the circulating beam without requiring ultra-fast injection<br />

elements, rotation in the longitudinal plane to bring the fresh bunches onto the central orbit and asymmetric merging<br />

to transport these ions into the centre of the large stack. Simulation results are presented for the complete repetitive<br />

stacking process for two candidate ion species of significantly different charge-to-mass ratio.<br />

Recent Gain in Polarized Beam Intensities for the Cooler Synchrotron COSY/Juelich<br />

Since January 1996, the cyclotron JULIC operates<br />

as the injector of H(-) or D(-) beams R. Gebel, O. Felden, R. Maier, P. von Rossen (FZJ)<br />

for the cooler synchrotron COSY at the IKP<br />

of the Forschungszentrum Juelich. Routinely about 8 microA of unpolarized or 1 microA of polarized H(-) ions are<br />

delivered for charge-exchange injection into COSY. A polarization in excess of 90 % was measured for protons inside<br />

the synchrotron COSY. Additionally, polarized and unpolarized D(-) ions have been delivered to experiments. A sequence<br />

of up to eight different polarization states for deuterons has been provided for experiments. By advancing the<br />

components of the polarized ion the number of polarized particles for injection into the cyclotron has been increased<br />

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<br />

sums up the characteristics of the ion sources and the cyclotron in their present mode of operation and describes<br />

the achievements towards higher beam intensities as well as for providing unpolarized and polarized H(-) and D(-)<br />

beams with high reliability.<br />

245<br />

TUPLS084<br />

TUPLS085<br />

TUPLS087

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