Production of multi-charged phosphorus ions with ecris 'SUPERSHyPIE' at GANIL

The Ganil's Ion Production Group tested the source SUPERSHyPIE123 for theproduction of phosphorus n+ ion beams. The SUPERSHyPIE ecris is used for many testsof multi-charged ion production and supply ion beams for LIMBE4 (low energie beamline). This ion source works with a 14.5ghz RF power injected by a circular waveguide inthe axis of the sourc

Ion sources at GANIL

International audienceThe GANIL produces since many years heavy ion beams with Electron Cyclotron Resonance ion sources. Different facilities have been constructed during the last years in order to allow experiments in a large range of energy (from some tens of kV to 100 MeV/nucleon). The list of available ions has been greatly extended with the construction of the SPIRAL1 facility that produces and accelerates radioactives ions . An overview of the different developments made at GANIL for stable and radioactive ion beam production including the sources for the SPIRAL2 project is given in this paper

MONOBOB: A radiation-hard and efficient 2.45-GHz ECRIS dedicated to radioactive ion production

International audienceMONOBOB, a new electron cyclotron resonance ion source (ECRIS) has been designed to ionise the radioactive elements coming from the production target of the SPIRAL II project. The goal was to build a long-lived ECRIS to work in the hostile environment of the target while presenting good ionisation efficiencies for gases. The numerous constraints related to the operation in a facility classed as ‘nuclear' have been taken into account during the design of the source. In this paper, however, we have concentrated in particular on (i) the radiation hardness of the magnetic structure, (ii) the injection of the RF power, (iii) the ionisation efficiency for noble gases, (iv) the ability of the source to work despite major outgassing and (v) the beam emittance. The first version of this source was tested to validate its principle by measurements of its performance. The results obtained with He, Ne and Ar permit us to predict ionisation efficiencies for Kr and Xe of the order of 80%, even with outgassing flows of the order of 1.2 × $10^16$ particle $s_1$. Under the same working conditions, between 60% and 80% of the beam current is included within an emittance of 30$\pi$ mm mrad at 20 kV, which could still be improved. Using the results obtained with the first version of the source, a second version respecting all the SPIRAL II constraints has now been designed and is under construction

Contribution to ion source developments for SPIRAL-2 and EURISOL

International audienceNext generation facilities such as those designed in SPIRAL-2 and EURISOL projects require dedicated radioactive ion sources. Indeed, the ion source must be capable of operating under the very strong radiation generated by the primary beam in the production target. In the framework of the SPIRAL-2 design study, realistic and efficient solutions have been studied to face these unprecedented irradiation constraints. The considered options will be described and argued. In particular, considering forced electron beam induced are discharge-type ion sources, the reasons to start the development of a new prototype, the ionization by radial electron neat adaptation (IRENA) ion source, will be presented. The IRENA ion source is based on the electron beam generated plasma ion source. The design of the first prototype will be presented and discussed

ICIS05 CONFERENCE

Contribution to Ion Source Developments for SPIRAL-2 and EURISO

Set-up for systematic measurements of diffusion of atoms from ISOL targets

International audienceThe design of radioactive ion production systems by Isotope Separator On Line method requires knowledge of diffusion features of atoms out of solids. With respect to the large number of possible diffusing atoms in target material, it is often difficult to find the right information in the literature, and inter-comparisons are often difficult due to differences in the experimental techniques and conditions. The TARGISOL European collaboration has the aim to study the relevant variables governing the release of radioactive elements from targets, to produce new radioactive ion beams and to build a data base which can facilitate the design of radioactive ion beam setups. The role of GANIL in this collaboration is to develop and produce new radioactive beams and provide new diffusion coefficient data. For this purpose, GANIL has designed a new system which removes part of the problems of comparing data. The approach is systematic measurements of release properties from several targets using the same process, the same apparatus and during the same experiment. This new approach will be presented with the set-up and the characterizing tests of the apparatus. Results of two experimental periods will be presented at this conferenc

Production of high intensity primary beams at GANIL

International audienceThe 100 kV platform used for the production of primary beams has been modified in order to increase the beam intensity. The configuration of the new platform is described and preliminary results are reported. A gain intensity of a factor of 2 has already been obtained for sulfur: $^{36}$S (65% enriched) 3.2 kW at 77.5 MeV/u, i.e., 1.14 p$\mu$A, as well as for nickel: $^{58}$Ni (68%) 1.5 kW at 74.5 MeV/uA, i.e., 0.35 p$\mu$A

Total efficiency of an isotope-separator-on-line production system based on an electron cyclotron resonance ion source associated with a carbon target: The case of SPIRAL 1

International audienceAn original approach to the time behavior of an isotope-separator-on-line production system is proposed in the case of a production system where the target and the ion source are connected through a conductance much larger than that of the exit hole of the source. One major goal of this article is to derive the analytical expression of the response time of the system for noble gases from statistical parameters only, which can be deduced from a few simple measurements. The validity limits of the expression of the total efficiency are given, and the calculations are compared to the results obtained at GANIL during operation of SPIRAL 1, using a carbon target close coupled to a multicharged electron cyclotron resonance ion source. The final analytical expression for the total efficiency shows that the usual product of diffusion efficiency, effusion efficiency, and ionization efficiency cannot be applied in our case. We show how it is possible to predict the atom-to-ion transformation efficiency for radioactive isotopes of noble gas using response times measured for stable isotopes

Direct 10 GHz rf feedthrough plasma device with the NANOGAN III ion source for SPIRAL

International audienceA new system has been designed to inject the 10 GHz rf power in the NANOGAN III ion source dedicated to the ionization of exotic atoms from the production target of the SPIRAL system at GANIL. The present system, based on a rectangular-to-coaxial transition equipped with a tuning piston, has been replaced by a direct rectangular-to-circular wave guide to feed the plasma of the source. We present the constraints related to the rf injection and a comparison is given of the present and new injection systems

Radio frequency injection system for electron-cyclotron-resonance ion source in a hostile environment

International audienceIn the framework of the Système de Production d'Ions Radioactifs Accéléres en Ligne Phase II (SPIRAL II) project, one of the ion sources which produce $1^+$ ions is an electron-cyclotron-resonance ion source (ECRIS). The source is installed in a region where the dose rate is such that the radiation hardness is very important for the materials used. Moreover, the proximity of the UCx target leads to additional constraints as potential surface pollution. A radiation-hard ECRIS has been designed, and the rf injection is under study. The results of rf injection with a wave guide and with an antenna will be presented. The performance obtained with both injection systems combined with the environmental constraints have led us to inject the rf using an antenna. The last point consists in designing a wave guide able to transport the rf through the shielding of the SPIRAL II plug. Design constraints, tests, and the current state of the project will be presented