The aim of the “beta-beams” is to produce pure electronic neutrino and anti-neutrino
highly energetic beams, coming from beta radioactive disintegration of the Ne18 and He6,
directed to experiment situated in the Fréjus tunnel. The high ion intensities are stored in a ring,
until the ions decay. Consequently, all the injected particles will be lost anywhere in the ring
and we have to take into account a high level of losses.
Only the disintegrations of the ion beam moving in the detector direction are useful.
We have to maximize this. Then, the shape of the decay ring is a racetrack. The two long
straight sections are aligned with the experiment detector.
The losses due to the decay of the radioactive ions are compensated with regular injections.
These should be done in presence of the circulating beam. The new ions are injected at a
different energy from the stored beam energy, then the old and the new ions are merged
with a RF specific program. The design of the ring must enable this type of injection and
accept the injected and stored beams. In this note, we will focus on the study of the
design of such a ring at the first and second orders.
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