Design of radially focused uniform X-ray source

The 10 MeV, 100 kW CW electron accelerator (FANTRON I) is being developed in Department of Nuclear Engineering, Seoul National University (SNU). The X-ray generated by the accelerated electron beam will be used in sterilizing the agricultural, forest and aquatic products. For the effective irradiation and the safety of the irradiated products, the uniform irradiation is needed. The designed target is mainly featured by the radially focused uniform X-ray. The diameter of irradiation hole is 0.75 m. And the generated X-ray is emitted toward the center of the irradiation hole with uniform distribution along the circumference. To generate the radially focused uniform X-ray, the accelerated electron beam must be focused radially on the target that is the outer shell of the irradiation hole with high uniformity. Additionally the electron beam must be injected in the normal direction on the surface of target because the intensity of electron incident direction is dominant in the angular distribution of bremsstrahlung intensity of the electrons, which are accelerated up to 10 MeV. The basic principle of targetary is deflecting electron beam with proper magnetic field configuration. To find such configuration a series of numerical analyses are performed. This paper includes the requirements and design results of the radially focused uniform X-ray source.