Abstract
This paper describes self-shielded high-intensity electron linear accelerators designed for radiation technologies. The specific property of the accelerators is that they do not apply an external magnetic field; acceleration and focusing of electron beams are performed by radio-frequency fields in the accelerating structures. The main characteristics of the accelerators are high current and beam power, but also reliable operation and a long service life. To obtain these characteristics, a number of problems have been solved, including a particular optimization of the accelerator components and the application of a variety of specific means. The paper describes features of the electron beam dynamics, accelerating structure, and radio-frequency power supply. Several compact self-shielded accelerators for radiation sterilization and x-ray cargo inspection have been created. The introduced methods made it possible to obtain a high intensity of the electron beam and good performance of the accelerators.
Highlights
There is a demand for electron linear accelerators with high beam power and local radiation shielding
Calculations of the electron beam dynamics in the accelerators have been performed by the DINA program complex, which uses the method of ‘‘macroparticles’’ and includes the following codes [14]: (i) DINA-ROZ—the 2.5D code for the description of the formation and acceleration of electron beams in a steady-state, periodic-intime regime; (ii) DINA-TIME—the 2.5D code for calculations of beam evolution in transition stages, without an assumption of the process periodicity in time; (iii) DINA3D—the 3D code for computer simulation of electron beam dynamics in a steady-state, periodic-in-time regime
Obtaining a high intensity of the electron beam in a compact accelerator with beam focusing by a rf field requires careful optimization of the accelerator and its components
Summary
There is a demand for electron linear accelerators with high beam power and local radiation shielding. They are designed for the radiation sterilization of medical devices and materials, x-ray inspection of containers, cars and trucks, etc. The application of self-shielded accelerators makes it possible to avoid construction of special buildings, as well as to promote and make less expensive the creation of radiation technology systems It provides the possibility of developing radiation sterilization systems that can be used in clinics and small facilities. Accelerators of this type should meet several specific requirements. This paper contains a detailed description of the accelerators, problems in their development, and solutions found
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