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

Cryogenic thermo-acoustic oscillations highlight and study in the SPIRAL2 superconducting LINAC

Cryogenic thermoacoustic oscillations is an area of interest of several studies. For superconducting accelerators, it is an unwanted phenomena that we usually want to get rid off. The SPIRAL2 superconducting accelerator had distributed Taconis all over its cryostats. This paper spans the different steps from their first detection to their damping with a highlight on the methods and the instrumentation that has been used. The presented study also sets the ground for a real life experimental investigation of thermo-ascoustics in complex geometries such as superconducting LINACs. With modern Big data analysis and simulation tools, it also sets the ground for the developments of new data linked codes that fit these complex situations

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

Cryogenic thermo-acoustic oscillations highlight and study in the SPIRAL2 superconducting LINAC

Cryogenic thermoacoustic oscillations is an area of interest of several studies. For superconducting accelerators, it is an unwanted phenomena that we usually want to get rid off. The SPIRAL2 superconducting accelerator had distributed Taconis all over its cryostats. This paper spans the different steps from their first detection to their damping with a highlight on the methods and the instrumentation that has been used. The presented study also sets the ground for a real life experimental investigation of thermo-ascoustics in complex geometries such as superconducting LINACs. With modern Big data analysis and simulation tools, it also sets the ground for the developments of new data linked codes that fit these complex situations

First full cool down of the SPIRAL 2 superconducting LINAC

International audience• First full cool down of the SPIRAL 2 superconducting linear accelerator. • Cool down requirements methods and procedures as well as actual data. • Preparing the operation mode through experimental run. • New multidisciplinary challenges between cryogenic and RF for superconducting accelerator

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