Charge Breeding ECR


Charge Breeding ECR

Before radioactive ions can be injected into the K500 cyclotron, they must have the proper charge-state for acceleration. The boosting of a singly charged ion to higher charge-states is termed “charge breeding”. The ECR ion source (CB-ECRIS) will be devoted to charge breeding the radioactive ions produced by the light and heavy ion guides. It was designed and built by Scientific Solutions of San Diego, California with a Phase I and a Phase II Small Business Innovative Research grant from the U.S. Department of Energy.

The source was designed to enable a minimum of contamination and a high degree of efficiency. The efficiency in injection is made possible by an open path through the injection plate and by external electrostatic Einzel lenses. The efficiency of capture and charge breeding is provided for by high magnetic containment fields and the plasma-chamber cooling protection that allows high microwave power input. Two large coils supply the axial mirror magnetic field, and a surrounding Halbach type hexapole, assembled with Nd-Fe-B permanent magnets, provides the radial mirror field. The plasma chamber is formed by a water-cooled aluminum liner. The source is of medium volume and will operate at 14.5 GHz with the possibility of adding a lower second frequency later.