Beam dynamics for heavy ion inertial fusion

Intense and heavy ion beams of concern for driving the targets in future heavy-ion inertical fusion reactors are strongly affected by space-charge forces. This is true for both the r.f. linear accelerator compressor ring scenario as well as for the induction accelerator system. The Low current (I greater than or equal to 1 A), long-pulse (about a millisecond) beams from several ion sources must be accelerated merged and compressed longitudinally to achieve the peak power (20kA, 10GeV, 10ns) required at the target. To achieve fuel ignition, the final beams must be focused to a small spot of only a few millimeters. This in turn requires careful control of the six-dimensional phase-space volume of the beams during the entire acceleration and final transport process. The major effects that can lead to increases in the transverse and longitudinal emittances will be reviewed.