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Description of SPIRAL2

In order to fulfil the demands of the large (700 physicists) international community using GANIL, it is proposed to extend significantly the actual possibilities of Radioactive Ion Beam (RIB) physics and related applications with the SPIRAL2 project.

Several domains of research in nuclear physics at the limits of stability will be covered by this project, including the study of the r and rp-process nuclei, shell closure in the vicinity magic numbers as well as the investigation of very heavy elements.

The SPIRAL2 project is based on a multi-beam driver in order to allow both ISOL and low-energy in-flight techniques to produce RIB. A superconducting light/heavy-ion linac with an acceleration potential of about 40 MV capable of accelerating 5 mA deuterons up to 40 MeV and 1 mA heavy ions up to 14.5 MeV/u is used to bombard both thick and thin targets. These beams could be used for the production of intense RIB by several reaction mechanisms (fusion, fission, transfer, etc.) and technical methods (ISOL, IGISOL, recoil spectrometers, etc.). The production of high intensity RIB of neutron-rich nuclei will be based on fission of uranium target induced by neutrons, obtained from a deuteron beam impinging on a graphite converter (up to 1014 fissions/s) or by a direct irradiation with a deuteron, 3He or 4He beam.

The post acceleration of RIB in the SPIRAL2 project is assured by the existing CIME cyclotron, which is well adapted for separation and acceleration of ions in the energy range from about 3 to 10 MeV/u for masses A~100-150. SPIRAL2 beams, both before and after acceleration, can be used in the present experimental area of GANIL.
An important aspect of this project is that it will allow GANIL to deliver to users up to five different beams in parallel.
A technical description of the project might be found in the Report of the SPIRAL 2 Detailed Design Study (APD).

SPIRAL2 is funded by the Institut National de Physique Nucléaire et de Physique des Particules (National Institute for Nuclear and Particle Physics) (IN2P3), which depends on the CNRS, the Direction de la Recherche Fondamentale (Fundamental Research Division) (DRF), which depends on the CEA, the Region and local authorities of Basse-Normandie, and is also supported by the European Union, through the  European project 'SPIRAL2 Preparatory Phase', and by international collaborations.

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