Electron Gun Cad Software And Rapid Design Study

After almost a hundred years of development, a complete theoretical system has been formed on vacuum electronics, which is greatly promoted by computers that are widely used because of their large-capacity, high-precision and high-speed. Computer aided design (CAD), which, becomes a key technology in producing engineering technology of microwave tubes, has been making great progress with developments and applications of computers.Electron optical system, which, deals with generation, electromagnetic focusing, space motion and collection of electron beam, is an important department of vacuum electron devices. The quality of electron beam, which offered by electron optics system, particularly electron gun, determines the desired result of microwave tubes. Now, the design method of electron gun is that the microwave tube designer input electrodes shape to an electron optics CAD software, then repeatedly to adjust the size of electrodes until figure out the electron beam which is desired. Well then, three questions are revealed in this method. The first, how did we get the electrodes external to the beam? The second, how did we design these electron optics CAD software? The last, whether or not the result of CAD software corresponds to reality, could these software be guide the engineering design for electron gun?This paper goes in for finding answers to these questions. First, we give detailed description on numerical computation method of electron optics. And then, we provide information of two electron optics programming modules, UESTC_GUN and EOS, which was developed by us. Three ways are used in this paper to test and verify the computing result of these two modules with examples. For the module of UESTC_GUN, we contrast its result to known electron optics parameter and the data of foreign electron optics programming modules. For EOS, empirical method was used. The results demonstrated that these two programming modules can well guide the engineering design. For the first questions, we provide four ways to design electron guns. The synthesis procedure and noniterative method are used to design Pierce gun. A theory for coupling gridded gun design with PPM focusing and a method based on synthesis of Pierce gun was used to design gridded guns. To check the data against the experimental data, we reach a conclusion that we can well solve the problem of design of the convergent Pierce electron gun and gridded gun.