Electron accelerator with coaxial cavity

Electron accelerator of the type comprising a resonant cavity with an outer conductor (10) and an inner conductor (20) having the same axis of revolution (A), a high frequency source (SHF) coupled to the cavity and supplying an electromagnetic field at a resonant frequency of the cavity, an electron source (S) able to inject into the cavity an electron beam (Fe) through a first inlet port (11) made in the outer conductor (10), the beam being injected along an electric field line (E) of the resonant field, means for deflecting electrons placed outside the cavity, said accelerator being characterized in that the inner and outer conductors of the cavity are cylindrical and the electron beam is injected in a plane perpendicular to the axis of the cavity where the radial component of the electric field is at a maximum and in that the deflection means comprise a first electron deflector (D1) having an inlet facing the first outlet port (12) made in the outer conductor (10) and diametrically opposite to the first inlet port (11) according to a first diameter (d1), said first deflector having an outlet facing a second inlet port (13) made in the outer conductor (10), a second electron deflector (D2) having an inlet facing a second outlet port (14) made in the outer conductor (10) and diametrically opposite to the second inlet port (13) according to a second diameter (d2) different from the first diameter (d1), said second deflector (D2) having an outlet facing a third inlet port (15) made in the outer conductor (10) and optionally further deflectors associated in the same way with other diameters of the outer conductor (10) and which all differ from one another, but are all located in said plane.