Drift-tube linac geometry optimization at 108 and 216 MHz

Abstract Drift-tube linear accelerator geometries at 108 and 216 MHz have been studied using the computer code SUPERFISH with the aim of optimizing the effective shunt impedance, ZT 2 . Optimum ZT 2 curves for particle velocities, β = v / c , ranging from 0.061 (1.75 MeV/amu) to 0.567 (200 MeV/amu) have been generated from over 2500 computer runs with SUPERFISH. These curves, although derived primarily for a high current electronuclear breeder accelerator, have general application for other proton or heavy ion linear accelerators.