Experiments of beam-induced-plasma for basic study of HIF (Heavy Ion Inertial Confinement Fusion) by RFQ-Linac

An intense heavy ion linear accelerator system is being constructed for basic researches on HIF and heavy ion pumped laser at TIT (Tokyo Institute of Technology). This accelerator system consists of an RFO-Linac, an ECR ion source, a fine-focusing beam transport system and a fast beam pulsing system. At present, the obtained maximum beam current from the TIT-RFQ is 1.6 mA for 4He+. By using this system, An ion beam of 4He+ with an energy of 220 keV/amu was focused onto a small spot area of about 1 mm2. This beam deposited a specific deposition power of about 0.14 GW/g to the target. The overall status of this linac system and preliminary experiments with beams of 4He+ are discussed. (author)