This article emphasizes a confinement model for electrons and ions in an ECR source for multicharged ions, on the basis of specific measurements performed on the 16.6 GHz MINIMAFIOS and 10 GHz CAPRICE facilities. The conclusions partially support the above model.

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Charge exchange between O8+ and He(1s2) is studied both theoretically and experimentally. In the energy range where capture cross sections have been measured good agreement is obtained between theory and experiments. Calculations predict that in single-electron capture the electron is transferred dominantly into O7+ (n=4), which is supported by earlier experimental work.

The principles, construction, and performance of the MINIMAFIOS electron cyclotron resonance ion source (ECRIS) are reviewed. The source can operate either pulsed, with pulse width of > 50 ms, or cw, with 10 1 \ fully stripped light ions per second and much higher amounts oflower charge state ions. The source has excellent reliability and reproducibility. It has acceptable emittance and energy dispersion. The manner of operation and adjustment of the source is very simple since it depends only on the two parameters: gas feed and rfpower injected. In addition, metallic ions can be produced directly. ECRIS is well suited for injection into heavy ion accelerators and for atomic physics. Its high ion fluxes in a quasicontinuous regime are useful for numerous other applications and open new fields for scientific research with multiply charged ions. Thus, more and better sources are desired. New ideas have been proposed and new sources have been built or are under construction. We present the latest performance data of MINIMAFIOS for gaseous elements as a reference for evaluating the performance of new ECRIS in various laboratories. For metallic ions we need more experimental results in order to establish basic data references.