Novel laser ion sources

Development in the field of high-power laser systems with repetition rates of several Hz and energies of few joules is highly active and opening, givi ng new possibilities for the design of laser ions sources. Preliminary inve stigations on the use of four different laser and target configurations are presented: (1) A small CO2 laser (100 mJ, 10.6 mu m) focused onto a polyet hylene target to produce C ions at 1 Hz repetition rate (CERN). (2) An exci mer XeCl laser (6 J, 308 nm) focused onto solid targets (Frascati). (3) A f emtosecond Ti: sapphire laser (250 mJ, 800 nm) directed onto a solid target s (Jena). (4) A picosecond Nd: yttrium-aluminum-garnet (0.3 J, 532 nm) focu sed into a dense medium of atomic clusters and onto solid targets (London). The preliminary experimental results and the most promising schemes will b e discussed with respect to the scaling of the production of high numbers o f highly charged ions. Different lasers are compared in terms of current de nsity at 1 m distance for each charge state. (C) 2000 American Institute of Physics. [S0034-6748(00)55702-5].