Method for Efficiency and Time Response Measurement on Diverse Target Ion Sources with Stable Alkali

International audienceDevelopments of new setups for radioactive ion beam production by the isotope-separator-on-line (ISOL) method are underway at GANIL in the frame of the SPIRAL (Système de Production d'Ions Radioactifs Accélérés en Ligne) and SPIRAL-II projects. The measurement of total efficiency and time behaviour of these new target/ion-source systems (TISSs) is a crucial step for these devices which aims to produce short-lived isotopes with high intensity. The overall atom-to-ion transformation efficiency depends on several processes: diffusion of the atoms out of the production target, effusion towards the ion source and ionization. The efficiency can be extracted using the ratio between the emerging yield and implanted flux in the TISS. Several methods have already been developed to achieve these measurements: the use of stable or radioactive beams, gas injection, or the introduction of solid material into the TISS. This paper focuses primarily on a method that uses stable alkali. A pulsed/CW alkali ion gun has been built and will be used to optimise diverse TISSs

Permanent magnets under irradiation and radiocative alkali ion beam development for SPIRAL1

International audienceUp to now, eighteen Target Ion Source Systems (TISSs) have been built and used for the production of radioactive ion beams on SPIRAL 1 facility, based on the Isotope- Separator-On-Line (ISOL) method. The TISSs are composed of thick carbon targets and of fully permanentmagnet Electron Cyclotron Resonance Ion Sources (ECRISs) of the Nanogan III type. After irradiation and a decay period of two years, the irradiated TISSs are dismounted and if their magnetic fields are still suitable, the ECRIS are used with a new target. Thereby thirty-two runs have been performed using new or renewed TISSs. , After irradiation, the measured magnetic field sometimes reveals magnet damage. Our experience is reported here. In the second section, we present the progress on the NanoNaKE setup, which aims to extend the radioactive ion beams in SPIRAL 1 to the alkali elements, by connecting a surface-ionization source to the Nanogan III ECRIS via a compact 1+ ion beam line. The main issues and difficulties are discussed and the preliminary solutions are described

MONOBOB II : Latest results of monocharged ions source for SPIRAL2 project

Original publication available at http://www.jacow.orgInternational audienceAmong the sources which can be installed in the radioactive ion production module of SPIRAL II, a singly-charged ECRIS has been chosen to produce ions from gaseous elements. Its characterization is under way on a test bench at GANIL. Extraction, transport and response time results are presented

New Target Ion Source Systems at GANIL/SPIRAL 1: prospective

International audienceSPIRAL1 facility is currently under transformation in order to extend the range of radioactive ion beam offered to users. It will be able to host a larger variety of Target Ion Source Systems by the end of 2016, needed to fulfill the production requirements related to the chemical variety of the isotopes demanded by the physicists. The extent of the transformation is limited by the frame of the safety regulation and by the existing facility. Nevertheless, several combinations of mono-charged or multi-charged ECR, FEBIAD and surface ionization sources with new target materials will become possible. Some of these combinations are already under test. Next ones will be presented versus scientific priorities and technical possibilities

SPIRAL 1 Upgrade at GANIL: status

International audienceThe Upgrade of SPIRAL1 aims to offer new radioactive ion beams to the physics community. Regarding the ion beams requested by the users, an important technical transformation was needed to make the current installation able to host new Target Ion Source Systems (TISS) suited to the production and ionization of the relevant isotopes, while preserving sufficient high charge states for post-acceleration. Part of the work has already been done: the irradiation cave has been transformed and successfully tested with two different TISSs in 2013. To match with the features of the cyclotron post-accelerator, the second part of the project consists in the installation of an efficient charge breeder, in a room surrounding the production cave which must first be transformed to be in conformity with the conclusions of a safety examination. The risk analysis related to the technical proposal has just been approved by the safety authority thus building transformations will start soon and should be completed by the end of 2015. Improvement of our charge breeder takes advantage of the experimental feed-back of existing on-line breeders (ANL/Argonne, LPSC/Grenoble). It is now built and on-line tests with stable primary ion beams are scheduled by spring 2015 at LPSC. In parallel, a TISS including a graphite target associated to a FEBIAD ion source, already tested on-line in 2013 to produce new radioactive ions on SPIRAL1, will be optimized before using it regularly after the SPIRAL1 Upgrade commissioning. Goals, technical progress and safety status will be presented with more details

The spiral1 charge breeder: key points for a performant 1+ beam injection

The SPIRAL1 charge breeder is now under operation. Radioactive beam has already been delivered [1] to Physicist for performing experiment. Although charge breeding efficiencies demonstrated high performances for stable ion beams, those efficiencies regarding radioactive ion beams were found, in the first experiments, lower than expected. The beam optics, prior to the injection of the 1+ ions into the SPIRAL1 charge breeder, is of prime importance [2] for getting such high efficiencies. Moreover, the intensities of the radioactive ion beams are so low, that it is really difficult to tune the charge breeder. The tuning of the charge breeder for radioactive ion beams requires a particular procedure often referred as blind tuning. A stable beam hav-ing a close Brho (few percent) is required to find out the set of optic parameters preceding the tuning of the radioactive beam. Hence, it has been decided to focus our effort on that procedure as to get control of the 1+ beam optics leading to high charge breeding efficiencies whatever the 1+ mass, energy and Target Ion Source System (TISS) used. Being aware that each TISS provide ion beams with a specific energy spread DeltaE, and given that the acceptance energy win-dow of the charge breeder is rather narrow; that parameter must play also an important role in the whole charge breed-ing efficiency

Production d'un nouveau faisceau d'ions au GANIL : le Titane

Depuis une trentaine d'années, le GANIL produit et accélère des faisceaux ions stables pour la communauté scientifique. Les ions accélérés sont de type gazeux ou métallique avec des énergies variant de 3,8 à 95Mev/A. Les progrès en termes de production de nouveaux éléments, d'intensité, de stabilité et d e reproductibilité résultent d'une activité continue de développement de nouveaux faisceaux. La production et la fourniture d'un faisceau de Titane 50 est depuis plusieurs années une demande récurrente des physiciens. Pour produire ce faisceau avec une source d'ions de type ECR4, nous nous sommes orientés vers la méthode MIVOC ( M etallic I ons fom V olatile C ompounds) en utilisant un composé organo - métallique, le Titanocène. L'utilisation de cette molécule est désormais envisageable suite au développement d e sa technique de synthèse par l'IPHC de Strasbourg. Après accélération par CSS1, et en prenant les rendements standards des accélérateurs du GANIL, un faisceau de 50 Ti 11+ à 4.8 MeV/A pourra être fourni sur cible avec une intensité de l'ordre 6 μAe (avec un échantillon synthétisé à partir d'un isotope enrichi à 90%)

The spiral1 charge breeder: key points for a performant 1+ beam injection

The SPIRAL1 charge breeder is now under operation. Radioactive beam has already been delivered [1] to Physicist for performing experiment. Although charge breeding efficiencies demonstrated high performances for stable ion beams, those efficiencies regarding radioactive ion beams were found, in the first experiments, lower than expected. The beam optics, prior to the injection of the 1+ ions into the SPIRAL1 charge breeder, is of prime importance [2] for getting such high efficiencies. Moreover, the intensities of the radioactive ion beams are so low, that it is really difficult to tune the charge breeder. The tuning of the charge breeder for radioactive ion beams requires a particular procedure often referred as blind tuning. A stable beam hav-ing a close Brho (few percent) is required to find out the set of optic parameters preceding the tuning of the radioactive beam. Hence, it has been decided to focus our effort on that procedure as to get control of the 1+ beam optics leading to high charge breeding efficiencies whatever the 1+ mass, energy and Target Ion Source System (TISS) used. Being aware that each TISS provide ion beams with a specific energy spread DeltaE, and given that the acceptance energy win-dow of the charge breeder is rather narrow; that parameter must play also an important role in the whole charge breed-ing efficiency

Future carbon beams at SPIRAL1 facility: which method is the most efficient?

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