Investigation of LIA-30 functioning in the mode of electron beam focusing

To increase bremsstrahlung intensity of a high power 36-module linear accelerator LIA-30 the electron beam focusing (compression) was realized. In the output assembly there was applied a focusing system of 9 solenoids. At the decrease of aperture from 400 to 180 mm this system provided growth of longitudinal magnetic field induction from 0.5 to 3.5 T at a length of 1.1 m. In addition to the established in the injector cathode with two emitters 60 and 150 mm in diameter the second ring cathode 250 mm in diameter was placed in the fifteenth module to improve homogeneity of bremsstrahlung field. There were obtained dose rate equal to ~ 7×10¹² rad/s, dose value equal to 150 krad (TLD) in a spot of ~100 cm² and 50-% inhomogeneity of irradiation. When the accelerator functions only with the second cathode the radiation dose rate and dose value constituted ~ 2.5×10¹² rad/s_c and ~ 50 krad (TLD) respectively in a spot of ~150 cm² area.