PRODUCTION OF MULTICHARGED RADIOACTIVE ION-BEAMS - NEW RESULTS FOR THE 1-]N+ METHOD WITH THE MINIMAFIOS AND SARA-CAPRICE ELECTRON-CYCLOTRON-RESONANCE ION SOURCES()

The backward and forward injection of a 1+ ion beam in a MINIMAFIOS ty pe electron cyclotron resonance ion source (ECRIS) have given good res ults for the 1+ --> n+ method. Due to the technological simplicity of the forward injection, additional experiments have been performed with this configuration. Different primary sources (1+) have been used for the injection (2.45 GHz ECRIS, hollow cathode source, simplified 10 G Hz NANOGAN type ECRIS), an increase of the performances has already be en obtained (Zn, Kr, Ar), and a measurement of the absolute efficiency with the NANOGAN type-MINIMAFIOS association is performed. Due to the high performance of the 10 GHz CAPRICE source used as a highly charge d ion injector in the first cyclotron of SARA (Systeme Accelerateur Rh one-Alpes), it has been tested as a different n+ source for the 1+ --> n + method, In this purpose, a low energy spread-low emittance thermo ionization Rb ion source has been used as 1+ injector. A standard oper ation of the SARA-CAPRICE source has been kept with respect to the mic rowave coupling. The spectra of the Rbn+ ions extracted are compared w hen using N-2 and O-2 as support gases. The highest efficiency is obta ined for the Rb13+. (C) 1998 American Institute of Physics. [S0034-674 8(98)51402-5].