Extraction system for RFQ cooler and buncher

Two different systems, static electric guide and miniature RFQ ( Radiofrequency Quadrupole), for ion extraction from a RFQ cool er and buncher have been discussed. By fluid dynamics calculation, the mass flow rate and possibly available vacuum of the being designed static electric extraction system have also been evaluated. We have made conclusions that the miniature RFQ should be used for a low helium buffer gas pressure to obtain a good beam quality, but for a higher gas pressure the static electric guide must be used. In addition, because the being designed RFQ cooler and buncher will always work in a relatively high gas pressure, the recycling and reusing of the high purity helium gas must be considered.