Digital design for structure of cathode/grid assemblies in electron curtain accelerator
The finite element method (FEM) is introduced to design a structure of cathode groupware for an electron curtain accelerator. An optimum structure of groupware and parameters of its heat source W wire have been designed. An uniform temperature distribution of 1 400～1 430℃ on the narrow planar LaB_6 cathode has been predicted, which is enough to emit sufficient electron beam. In order to insure exact thermal physical parameters (such as heat emissivity and heat conductivity) of all the materials, an additional iterative algorithm is adopted. It takes only four iterations to get the convergent result. The method makes analysis process more efficient and compact. Experiment has proved the validity.