International audienc

SPIRAL, the Radioactive Ion Beam (RIB) Facility at GANIL, Caen will use the high intensity, heavy ion beams of GANIL for the production of radioactive species by the ISOL method.The Radioactive Beams produced by the target and source assembly, will be accelerated up to a maximum energy of 25 MeV/u by the new cyclotron CIME. Preliminary tests of CIME with stable ions were presented in the previous cyclotron conference at Caen in 1998. Since then, important progress were made in the commissioning of CIME. They are presented in this paper as well as the present status of the delivery of the administrative authorizations which are needed for the production of the first radioactive beams by the facility.

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International audienceThe GANIL heavy ion accelerator can be used as a driver for producing exotic beams either by fragmentation of the projectile, or by the ISOL method through the SPIRAL complex. The accelerator was first equipped with several devices for protection against thermal effects and activation. Then tests were carried out to increase the primary beam intensities, especially for projectiles ranging from C to Ar. The goal of 2×1013 pps was obtained with a 75 MeV/n carbon beam extracted from SSC2 for several hours. Losses at extraction limited the Ar intensity to 5×1012 pps, while a 1×1013 pps was aimed at. For some other ion species, substantial increases were obtained, although their use are somewhat limited by weaknesses in the concrete shielding. Detailed results of these tests are discussed. Possible cures to overcome limitations are presented, along with results of simulations concerning the effect of longitudinal space charge forces

An original method of mass measurements using the GANIL facility cyclotrons as an Accelerator-Mass spectrometer system is presented. The first test runs show that a precision of 3.10-6 can be achieved. Further improvement of this value can be obtained. Although some limitations apply to this technique, a broad spectrum of nuclei can be studied by this method.