POST-ACCELERATION OF HIGH INTENSITY RIB THROUGH THE CIME CYCLOTRON IN THE FRAME OF THE SPIRAL2 PROJECT AT GANIL

The cyclotron CIME is presently used at GANIL for the acceleration of SPIRAL1 radioactive beams. One of the goals of the SPIRAL2 project is to produce, postaccelerate and use in the existing experimental areas much higher intensity secondary beams induced by uranium fission like neutron-rich krypton, xenon, tin isotopes, and many others. Intensity may reach 1010 pps. Specific developments are needed for secondary beam diagnostics. Improvement of mass separation is also necessary, and the Vertical Mass Separator (VMS) is specially developed for this purpose. However, the main concern is related to the high radioactivity linked to RIB high intensity. Safety and radioprotection issues will require modifications of the installation with special care for the maintenance of the cyclotron. The experience of the SPIRAL1 beams, in terms of beam losses and equipment contamination, is especially useful to define the necessary modificationsIMP;Chinese Academy of Science

PROGRESS OF CONSTRUCTION AND INSTALLATION OF THE SPIRAL2 ACCELERATOR

Officially approved in May 2005, the SPIRAL2 project is under construction at GANIL, with the active participation of French laboratories (CEA, CNRS) and international partners. This new facility is composed of a linear accelerator producing deuteron, proton and heavy ion beams in a wide range of energies and intensities, with two dedicated experimental areas in the fields of Neutron for Science (NFS) and very heavy and super heavy element production (S3). In a second step, the facility will also produce rare elements serving a low energy RIB experimental hall, or post-accelerated by means of the existing cyclotron CIME. This paper presents the performances of the main accelerator components, its construction status and the installation process into the SPIRAL2 building

A comparison of the velocity spectra obtained with the Boltzmann and Boltzmann-Langevin equations

The velocity spectra of Intermediate Mass Fragments produced in the reaction {sup 12}C {plus} {sup 12}C at 30, 40, 50, and 60 MeV/A are studied using both the Boltzmann and the Boltzmann-Langevin approaches. We find that the velocity distribution obtained with the stochastic Boltzmann-Langevin equation is significantly different from that obtained with the standard (non-stochastic) Boltzmann equation. 7 refs., 1 fig