Abstracts Brochure - CERN

WEPCH — Poster Session 28-Jun-06 16:00 - 18:00
The Beta-beam Decay Ring Design
The aim of the beta-beams is to produce
highly energetic beams of pure electron neu- A. Chance, J. Payet (CEA)
trino and anti-neutrino, coming from beta
radioactive decays of the 18Ne 10+ and 6He 2+ , both at gamma = 100, directed towards experimental halls situated
in the Frejus tunnel. The high intensity ion beams are stored in a ring until the ions decay. Consequently, all the
injected particles will be lost anywhere in the ring, generating a high level of losses. The ring circumference has
to be a multiple of the SPS circumference. The straight sections must be as long as possible in order to maximize
the useful neutrino flux. The straight section length is chosen to be about 35% of the circumference length, which
gives 1-km-long arcs. The bend field in the arcs is then reasonable. The arc has been chosen as a 2Pi phase advance
insertion, which improves the optical properties (dynamic aperture and momentum acceptance) and allows the easy
determination of the working point by the optics of the straight sections.
The Losses Management in the Beta-beam Decay Ring
The aim of the beta-beams is to produce pure
electronic neutrino and anti-neutrino highly A. Chance, J. Payet (CEA)
energetic beams, coming from beta radioactive
disintegration of the 18Ne 10+ and 6He 2+ , both at gamma = 100, directed towards experimental halls situated in
the Frijus tunnel. The high intensity ion beams are stored in a ring, until the ions decay. Consequently, all the injected
particles will be lost anywhere around the ring generating a high level of losses. In order to keep a constant neutrino
flux, the losses due to the decay of the radioactive ions are compensated with regular injections. The new ion beam is
then merged with the stored beam with a specific RF program Two sources of losses have been considered: -The betadecay
products: their magnetic rigidity being different from the reference one, they are bent differently and lost. -The
losses during the injection merging process. The first one needs a particular ring design in order to insert appropriate
beam stoppers at the right place. The second one needs a specific collimation system which allows beam longitudinal
halo cleaning between two successive injections.
Beam-based Alignment for the Storage Ring Quadrupole and Sextupole Magnets of
SOLEIL
First beam-based alignment (BBA) measurements
will be carried out during the commis- A. Madur, P. Brunelle, A. Nadji, L.S. Nadolski (SOLEIL)
sioning of the SOLEIL Storage Ring that will
start in April 2006. The results will allow calibrating the zero reading of the 120 Beam Position Monitors (BPMs) with
respect to the magnetic centre of the adjacent quadrupoles or sextupoles. BPMs being either adjacent to quadrupoles
or sextupoles, we plan to resort to two different BBA methods related to each multipolar magnet. Moreover, as
some BPMs are located near both quadrupole and sextupole, the use of both methods will allow us to cross-check
the results. We will present here the first results and the comparison with the positions of the magnetic centres as
obtained from the magnetic measurements.
275
WEPCH008
WEPCH009
WEPCH010