Characteristics of the injected ion beam in the ECR charge breeder 1+→n+1^{+}\to n^{+}

Different ion species (rare gases, alkali, metallic) have been injected on the axis of the MINIMAFIOS - 10 GHz - Electron Cyclotron Resonance Ion Source which is the basics of the 1+ -> n+ method, special attention have been paid to the optics of the incoming beam for the validation of the 1+ -> n+ method for the SPIRAL project (Radioactive Ion Beam facility). The capture of the incoming ion beam by the ECR plasma depends, first, on the relative energy of the incoming ions with respect to the average ion energy in the plasma, and secondly, on the optics of the injection line. The efficiency of the process when varying the potential V n+ of the MINIMAFIOS source with respect to the potential V 1+ applied to the 1+ source (DV=V n+ -V 1+ ) is an image of the energy dispersion of the 1+ beam. 1+ -> n+ spectra efficiencies, DV efficiency dependence for the most efficient charge state obtained, and measured primary beam emittances are given for the Ar, Rb, Pb, Cr. Highest efficiencies obtained are respectively Ar1+ -> Ar8+ : 8.7 %, Rb1+ -> Rb15+ : 5.5 %, Pb 1+ -> Pb 22+ : 4.8 % , Cr 1+ -> Cr 12+ : 3.5 %. Last results obtained are given for Sulfur and Uranium

New xenon results of Phoenix at 28 GHz

The classical PHOENIX 28 GHz electron cyclotron resonance ion Source (ECRIS) has been developed to prospect high pulsed multi charged lead ion (MCI lead) beams for the Large Hadron Collider (LHC) [1,2]. The goal of the experiment is to reach 1 emA pulses of Pb27+ during 0.4 ms with a 10 Hz repetition rate. This high beam current is one order of magnitude higher than the ones available nowadays. The strategy to take up this challenge is based on an increase of the radio frequency (RF) to 28 GHz and an increase of the RF power density. A new high acceptance, high resolution analysing beam line has been coupled to PHOENIX in order to study efficiently the intense beams delivered by the source. Thus, 0.6 emA of Xe20+ has been measured in the afterglow (AFG) among 9 emA analysed in the Faraday Cup (FC). The lead production is under study and a preliminary beam of 0.6 emA of Pb24+ AFG has already been obtained. The cross check of a 3D beam simulation program and measured beam characteristics enables to estimate the beam emittance to be ~ 200 mm.mrad. The project of development of an upgraded version of PHOENIX is presented (a new ECRIS named APHOENIX)

La transformation 1+ →\rightarrow n+ : resultats et perspectives

LPSC-si

Rapport d'etape sur les mesures de rendements de transformation 1+ →\rightarrow n+

LPSC-si

Electron cyclotron resonance ion trap, a multicharged ion breeder/buncher

International audienceThe basic mode of operation of an electron cyclotron resonance ion source is recalled, particularly when using such a device as an ion charge breeder for the production of radioactive ion beams suitable for acceleration (1+→n+conversion). A new mode of operation, Electron Cyclotron Resonance Ion Trap (ECRIT), permitting to trap and bunch the n+ ion beams is demonstrated. The principle of the ECRIT mode is explained. The charge breeder/buncher system is experimentally verified by the injection of a 400 nA Rb1+ ion beam leading to a 11.5 μA peak current of the Rb15+ ion beam extracted during the first ms. The temporal evolution of the cumulated particle transformation efficiency is measured in the case of Rb15+ and shows a 2.2% efficiency during the first 20 ms of the ECRIT extraction. The interest of the ECRIT mode is finally shown when used for the production of high-energy radioactive ion beams. (Elsevier