METHOD FOR ACCELERATING ELECTRONS IN A LINEAR ACCELERATOR AND AN ACCELERATING STRUCTURE FOR CARRYING OUT SAID METHOD

摘要

The invention relates to a method for accelerating low-injection energy electrons in a continuous standing wave linear accelerator (9) consisting in successively grouping electrons, in accelerating said electrons in a high-frequency electromagnetic field, which is formed in accelerating units (2, 3, 4<SUB>i</SUB>) and in which the electron flow is supplied directly from a low-energy electron source (10) to said subsequently accelerating cells (2, 3, 4<SUB>i</SUB>) interconnected via connection cells (5, 6<SUB>i</SUB>), in grouping electrons with the aid of the first accelerating unit embodied in the form of a bunch resonator (2) at a determined voltage Ug on the gap thereof, in increasing the electron energy in the second accelerating unit embodied in the form of a booster resonator (3) in such a way that the relative speed thereof ß is = 0.4-0.5, wherein the optimal bunching thereof is carried out according to the electron flow speed at the bunch resonator (2) input and to the high-frequency electromagnetic field wavelength, and in accelerating the electron energy in the accelerating unit (4<SUB>i</SUB>) following-up the second unit to a required quantity, wherein the optimal phase of particles with respect to the electromagnetic field is ensured, at least in the accelerating units in which non-relativistic electrons whose kinetic energy is less than a rest energy equal to 0.511 MeV are supplied, by selecting the length (L<SUB>1</SUB>, L<SUB>i</SUB>) of the accelerating structure segment, which is located between the centres (E<SUB>2</SUB>, E<SUB>3</SUB>, E<SUB>41</SUB>, E<SUB>4I</SUB>) of the adjacent connection cells and comprises said accelerating unit, wherein said selection is based on the equality between the relation of the length (L<SUB>i</SUB>) of each following segment to the length (L<SUB>I-1</SUB>) of the previous segment and the relation of the average electron speed in the previous segment to the average electron speed in the following segment.