Abstract
The longitudinal instability which is certain to occur in the heavy ion fusion (HIF) beams in an induction linac (linear accelerator) and is currently considered to be a major question as to the feasibility of the induction linac as an option in accelerator design is discussed. The instability in question is a close relative of the well-known microwave instability in circular accelerators but with distinctive features in this unfamiliar parameter range. That it should occur in a linear accelerator is due to the fact the ions are non-relativistic all the way (10 GeV at mass 200 to 50 MeV/nucleon to beta =0.3) and regenerative bunching can occur at an unpleasant rate in a kiloampere beam subjected to the impedance of the accelerating modules themselves. The author presents the results of analytic and computational work on module impedances, growth rates and feedback (forward) systems. >
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