电子帘加速器中阴栅组件结构的数字化设计
Digital design for structure of cathode/grid assemblies in electron curtain accelerator
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摘要: 在电子帘加速器的电子枪阴栅组件的结构设计中引入有限元分析法,研究不同材料不同结构的阴栅组件的温度场及其分布,进而得到了优化的结构及热源参数。在以2.35kW电功率加载于直径为1mm的热源钨丝时,在发射体上获得了产生稳定电子束流所需的1 400~1 430℃的均匀温度场,设计结构的热效率达到75%。计算中采用了一种迭代方法,只需4次迭代计算就获得了收敛的计算结果,从而在计算中能够采用各材料准确的热物性参数,使计算过程简洁有效。Abstract: 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 LaB6 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.
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Key words:
- finite element method (fem) /
- cathodes/grid assemblies /
- lab6 /
- thermic emission /
- optimization design
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