Properties of Laser-Produced Highly Charged Heavy Ions for Direct Injection Scheme

To accelerate highly charged intense ion beam, we have developed the Direct Plasma Injection Scheme (DPIS) with laser ion source. In this scheme an ion beam from a laser ion source is injected directly to a RFQ linac without a low energy beam transport (LEBT) line and the beam loss in the LEBT can be avoided. We achieved high current acceleration of carbon ions (60mA) by DPIS with the new RFQ optimized for the high current beam. As the next step we will accelerate heavier elements like Al as target in LIS (using Glass-laser: Max 4.39J/cm²). To obtain very high current Al beam, we examined the properties of the laser-produced Al plasma. Also a comparison of the glass laser and small YAG laser for the DPIS was studied usin a carbon target.