A drift tube linear accelerator (linac) that can be used for the acceleration
of
low energy ion beams. The particles enter the linac at low energy and are accelerated
and focused along a straight line in a plurality of resonant accelerating structures
interposed by coupling structures up to the desired energy. In the accelerating
structures, excited by an H-type resonant electromagnetic field, a plurality of
accelerating gaps is provided between drift tubes supported by stems, for instance
alternatively horizontally and vertically disposed. A basic module composed of
two accelerating structures and an interposed coupling structure, or a modified
coupling structure connected to a RF power generator, is if necessary linked to
a vacuum system and equipped with one or more quadrupoles.
