The Physical Design Of The C-band Standing Wave Accelerating Tube And Experimental Research

Along with the appearance of high-power C-band and X-band microwave source, the improvement of machine process level such as the numerical control process machine tool, and along with a crying need of practical application, miniaturization is turning into one of the necessity trend of accelerator's development.Firstly, it is investigated in this dissertation the development actuality and application foreground including the requirement of some departments such as medical treatment sanitation as well as industry CT departments etc. And it is also briefly discussed in this dissertation some physical and technique problems about C-band accelerating tube. At the same time, brief equivalent circuit analysis of ideal bi-period structure is reviewed, and that of accelerating cavities (mostly comprises multilevel bunching section) is briefly presented.Secondly, theoretic analysis of electromagnetic field in SW accelerating tube is performed in this dissertation. Simultaneity, analysis of portrait movement, landscape orientation movement of electron and the influence of space charge on landscape orientation movement of electron is also processed. In addition, electromagnetic field mathematical software SUPERFISH and particle dynamic calculation software GPT, PARMELA are introduced in order to implement the electromagnetic field numerical calculation and particle dynamic simulation.Thirdly, physical design and optimization research on C-band accelerating tube is detailedly performed in Chaper 4 of this dissertation. We wrote a application programming interfaces of SUPERFIHS and GPT software using C language. By means of this program, we make a detailed optimization on C-band SW accelerating tube. Together, the influence of each parameters of cavities especially the first cavity in bunching section on microwave performance of the cavities and on dynamic simulation result is studied in detail. Finally, a physical design scheme of C-band accelerating tube design is gained. The detailed design parameters and dynamic simulation results are shown in the dissertation.Cold tests and tuning of C-band accelerating cavities are performanced in the lastpart of the dissertation. The contents are: measure and tuning of accelerating cavities, coupling cavities, measure of quality, field distribution, dispersion curve . and the way of measuring and eliminating the stop band, etc. At the same time, utilizing the test data and the dispersion equation of cavity chain, we make a fit dispersion curve by way of least squares fit, and we work out the width of stop band and the intercavernous coupling coefficient.