INNOVATIVE DESIGN PRINCIPLES OF SUSI – SUPERCONDUCTING SOURCE FOR IONS AT NSCL/MSU

An ECR ion source is being designed to replace the existing 6.4 GHz SC-ECRIS. This ECRIS will operate at 18+14.5 GHz microwave frequencies. The radial magnetic field will be produced by a superconducting hexapole coil, capable of 1.5 T at the aluminum plasma chamber wall (R=50 mm). The axial trapping will be produced with six superconducting solenoids enclosed in an iron yoke. We will present the Flexible Axial Magnetic Field Concept, introduced for the first time in this design, which will allow tuning the distance between the plasma electrode and resonant zone in the plasma. The injection hardware and bias disc will be separately movable allowing great flexibility of tuning the ion source