Research On Technical Problems On Nuclear Technology Application

Nuclear Technology can be divided into Non-power nuclear technology and power nuclear technology. This dissertation focus on the research of key technologies concerned to the application of nuclear technology.The non-power nuclear technology is a high-tech, environmental friendly and energy saving industry. The fast-developing non-power nuclear technology application industry not only provides new materials to a few industries, promotes the optimization and updating of traditional industries but also helps to the achievement of energy saving and emission reduction, as well as a construction of a energy-saving and environmental friendly society.By an in-depth investigation and comparison of the non-power nuclear technology application of both home and aboard, and by investigations on related enterprises, this dissertation proposed practical suggestions for the development of non-power nuclear technology industry in Hubei Province, which solved two key issues:the verification of the non-power nuclear technology industry becoming a new growing point of Hubei economy and the function of the non-power nuclear technology industry in the construction of a energy-saving and environmental friendly society in Hubei Province.The High-voltage accelerator is a major application of the non-power nuclear technology. It is complicatedelectro-magnetic equipment, in which the change of a single element may have great effect on the final beam. The author, based on the basic theory of accelerator beam transmission, applied TRANSPORT program on the calculation of high-voltage accelerator beam light path, and testified the basic frame of high voltage accelerator, including the choice, design and layout of elements. The authoralso explored the practicability at the initial stage.The scanning width and evenness are the critical criteria of radiation accelerators as it determines the final radiation effect. The author originally proposed a permanent magnet spread system. Compared with ordinary electron beam scanning system, it effectively promoted the evenness of the spread electron beams and achieved the electron beam spread section at a larger area. Besides, it also decreased the chances of the burning-through of the titanium window. Based on the finite element of electromagnetic field and the beam dynamics simulation, the author calculated the magnet spread of spread systems of different structures, and by modifying and optimizing the structures, finally proposed and testified a spread system guarantees the evenness of the spread electron beam. The nuclear fusion energy is generally recognized as the most promising solution of the human resource problems. The International Thermonuclear Experimental Reactor, ITER has drawn great attention and support from the governments and scientific field all over the world as a compound of the most advanced science and technology of controlled magnetic confinement in the world wide. The Neutral Beam Injector, NBI, is the main method of the heating and electricity-driving of massive magnetic confinement reactor plasma. By conducting research on the key technology of the negative ion source——the diagnosis system by applying OES and Langmuir Probe as the main diagnosis method, the author designed the optimized diagnosis location of negative ion source cavity. Combing with proper experiment, it also came to an optimized data processing method for Langmuir probe.The function of negative ion source in the magnet filter field system is to filter the "fast electrons" so as to enhance the productivity of negative ions in ion source. How is the magnet filter field effecting the plasma inside the cavity has always been the focus of the magnetic field research. By the finite element analysis of electromagnetic field in filter field, and combing the successful experience, the author designed the filter magnetic field system applicable to the projects and finished the mechanical drawing which is ready to be processed so as laid the foundation for the project experiment.The Cs system is the key part of negative ion source. By reducing the work function on metal surface, the Cs system can increase the production of negative ion, improve the extraction negative ion current, reduce the work pressure in the negative ion source and reduce the ratio of electron/negative ion. Without Cs, the he negative ion source cannot meet the standardrequired by NBI. By studying the effecting mechanism of Cs to the work function, and by engaging in the IPP-BATMAN equipment test, the author testified the Cs system’s effect on the plasma parameter and suggested a solution to the Cs system for the negative ion source project of the team.