Spiral 2 Cryogenic System for The Superconducting LINAC

International audienceSPIRAL 2 is a rare isotope accelerator dedicated to the production of highintensity beams (E = 40MeV , I = 5mA). The driver is a linear accelerator (LINAC) thatuses bulk Niobium made quarter wave RF cavities. 19 cryomodules inclose one or two cavitiesrespectively for the low and the high energy sections. To supply the 1300W at 4:2K requiredto cool down the LINAC, a cryogenic system has been set up. The heart of the latter is a 3turbines geared HELIAL®LF (ALAT) cold box that delivers both the liquid helium for thecavities and the 60K Helium gaz for the thermal screens. 19 valve-boxes insure cryogenic uid distribution and management. Key issues like cool down speed or cavity RF frequency stabilityare closely linked to the cryogenic system management. To overcome these issues, modellingand simulation efforts are being undertaken prior to the first cool down trials. In this paper, wepresent a status update of the Spiral 2 cryogenic system and the cool down strategy consideredfor its commissioning

First partial cool down of the SPIRAL 2 LINAC

International audienceSpiral2 is a rare isotope accelerator dedicated to the production of some of the highest intensitybeams on earth. Its driver is a superconducting linear accelerator that takes advantages of 26 bulkniobium quater wave accelerating cavities. It takes up to 1000W@4K, 95 cryo-valves and 22automations systems to cryogenically operate the LINAC. The talk will present the achievement ofyears of hardwork to make the first trials of the LINAC partial cool down with its successes andchallenges

Upgrade of the SPIRAL identification station for high-precision measurements of nuclear β decay

The low-energy identification station at SPIRAL (Système de Production d'Ions Radioactifs Accélérés en Ligne) has been upgraded for studying the β decays of short-lived radioactive isotopes and to perform high-precision half-life and branching-ratio measurements for superallowed Fermi and isospin T=1/2 mirror β decays. These new capabilities, combined with an existing Paul trap setup for measurements of β-ν angular-correlation coefficients, provide a powerful facility for investigating fundamental properties of the electroweak interaction through nuclear β decays. A detailed description of the design study, construction, and first results obtained from an in-beam commissioning experiment on the β+ decays 14 O and 17F is presented