A Compact High Brilliance Ion Source For RFQ Injection

The High EFiciency Source (HIBFS) is a compact high brilliance ion source designed to supply intense ion beams as needed, e.g., for the injection into RFQ-accelerators. One aim of its development was the generation of nearly pure atomic ion beams with a single charge state only (e.g. N*, Ar’, He’). Additionally, oxygen resistant cathodes enable an operation with oxygen and a production of nearly pure 0 ’ ion beams. In order to investigate diierent possibilities of magnetic con-finement, the source was operated either with cusp magnets or with a solenoid. For operation with nitrogen (N-fraction> 95%) with an arc power of 2 kW, a current density of 220 mA/cm ’ (full beam) has been achieved. Measurements have been performed concerning the ion beam composition, the beam current density, the beam emit-tance and the electron and ion distribution. It has been shown that the source and the extraction system are operating near the theoretical imits with respect to perveance and emit-tance. By using Helium as operation gas, the 80 % normalized 4rms-emittance was measured to 0.00371 mmmrad, which corresponds to an ion temperature of 300 K only. 1