[en] The object of the invention is to simplify the construction of the particle outlet device of a microtron and to improve reliability of the said device. The vacuum chamber of the microtron is provided with three rectangular solenoid coils which are placed on the orbits from which particles are taken out. Each coil comprises two similar parts placed symmetrically with respect to planes of orbits of the accelerated particles, the said coils being pressed to the poles of an electromagnet. The length of each coil is equal to K-2R, where K is the distance between the orbit common point and the axis of the extracting magnetic shunt, and R is an orbit radius of the particle outlet. The coils are placed at a distance R from the common diameter of orbits. The particle outlet device of the microtron is excessively effective due to absence of slipping vacuum seals; the overall dimensions of an accelerator in this case are reduced