[en] The purpose of the invention consists in reduction of the length of the synchrotron accelerating system. Two variants of the accelerating system are suggested. The accelerating system of the synchrotron is made up of sections of the coaxial line an end of which is shortened and the other one is loaded by capacitance formed by the end-face surfaces of the conductors which have coaxial openings for fly-over of charged particles. The other system differs in that for reduction of the resonator length at least one coaxial section is connected between the ends of the line; this coaxial section is loaded by the capacitance formed by the end-face surfaces of the conductors of this section