An ion beam cooler for collinear laser spectroscopy

An ion beam cooler has been constructed and tested at the IGISOL mass separ ator facility at the University of Jyvaskyla. The cooler is designed to imp rove the ion optical properties of radioactive ion beams produced with fiss ion-, light-ion fusion and heavy-ion fusion ion guides. The performance of the device has been tested in off- and on-line conditions. It has been show n that the emittance and energy spread of the ion beam can be decoupled fro m the ion guide parameters with high transmission efficiency.