Drift tube (15) linear accelerator (linear accelerator) (4), this can be used for that low energy ion beam is accelerated to be disclosed. Particle enters linear accelerator (4) in low energy and accelerated and focus multiple resonance accelerating structures (8) along a straight line and be inserted through structure (9) is reached required energy, such as the needs for the treatment of. In accelerating structure (8), excitation by H-type resonant electromagnetic field, multiple accelerating gaps (20) are provided at the drift tube (15), the drift tube is by support shank, such as (16) and (17) are horizontally or vertically arranged. Basic module (7), it discloses by the coupling structure (9) of two accelerating structures (8) and insertion, RF power generators (11) are connected to if necessary to modify coupling structure (9A), it is connected if necessary with vacuum system (13) and outfit when necessary using one or more quadrupoles (18). The basic module (7) can be extended, obtain module (7A), couple structure (9 with some odd number n, so still 9A) it is if necessary equipped with one or more quadrupoles (18) and+1 accelerating structures of even number N=n (8). It is recommended that comprising one or more modules (7,7A) and allowing to obtain very big accelerating gradient and very compact structure in linear accelerator (4).
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