Abstract
As the Gyrotron magnetron injection gun (MIG) plays a significant role in determining the efficiency and reliability of the Gyrotron, 3-dimensional thermal and structure analysis using FDTD code CST is presented. The detailed model of the MIG has been created by CST Mphysics Studio. With the detailed structure and material properties setting, temperature distribution in the MIG is calculated, and deformation analysis at critical locations in axial and radial direction have been carried out. Under the condition of the deformation, electron beam parameters of the MIG are compared with the initial design values using CST Particle Studio. It shows in the case of deformation value, which is under the condition of filament's temperature is $\pmb{1000}$ , changes of the velocity spread, the velocity ratio and the variation of guiding center radius are within the acceptable range. According to deformation error analysis, appropriate correction amount is introduced in the manufacture of the Gyrotron.
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