• G. Sénécal, T. André, P. Anger, J. L. Baelde, C. Doutressoulles, B. Ducoudret, C. Jamet, E. Petit, E. Swartvagher
  GANIL, Caen

In order to provide several kilowatt stable ion beams for radioactive ion beam production, the Grand Accélérateur National d’Ions Lourds (GANIL) upgraded several devices. A High Intensity Transport (THI) safety system has also been studied in 1995 and validated in 1998. By monitoring beam losses all along the cyclotrons and lines and shutting down the beam in case of problem, this system allows accelerating and sending onto targets up to 6kW power beams (instead of 400W in standard mode). Beam losses diagnostics, the associated electronics and software will be depicted (principle, location) as well as the tuning method of the machine to reach step by step the needed power.

• J. L. Baelde, C. Berthe, F. Chautard, F. Lemaire, S. Perret-Gatel, E. Petit, E. Pichot, B. Rannou, J. F. Rozé, G. Sénécal
  GANIL, Caen

For the GANIL safety revaluation and the new project of accelerator SPIRAL 2, it was decided to replace the existing access control system for radiological controlled areas. These areas are all cyclotron rooms and experimental areas. The existing system is centralized around VME cards. Updating is becoming very problematic. The new UGA (access control unit) will be composed of a pair of PLC to ensure the safety of each room. It will be supplemented by a system UGB (radiological control unit) that will assure the radiological monitoring of the area concerned. This package will forbid access to a room where the radiological conditions are not sure and, conversely, will forbid the beam if there is a possibility of presence of a person. The study of the system is finished and the record of safety in preparation. At GANIL, the ions are accelerated by cyclotrons (C01 or C02, CSS1, CSS2, CIME) and are transported through beamlines towards the rooms of experiments (D1-D6, G1-G4). A first named extension SPIRAL was brought into service in 2000. It makes it possible to produce and post-accelerate, via the cyclotron CIME, the radioactive ion beams obtained by fragmentation of stable ions resulting from CSS2 in a carbon target. The project SPIRAL2 will arrive soon and has the same need in safety. Each room must thus remain confined (without human presence) when potentially dangerous ionizing radiations are present. This protection was identified as an important function for safety and is provided by EIS (Important Equipment for Safety). The EIS of GANIL are referred and described in the RGE (General Rules of Exploitation). It was decided to replace the current systems of security management by four distinct but interconnected systems.