Electromagnetic and particle-in-cell simulation studies of megawatt asymmetrical resonant magnetron

Abstract

The asymmetrical resonant magnetron has been theoretically analysed and thoroughly simulated in this paper. By introducing the strap breaks and asymmetrical resonant cavity, the weaken field of the interaction zone can increase the interaction efficiency and the enhanced field of the output coupling also can improve the output power. Through the PIC simulation, the electron dynamics theory can be validated, at the same time, the critical characteristics such as the mode competition, output power and the conversion efficiency have been also well examined. The result shows that a careful control of the operating parameters is important for the performance, and this magnetron can finally generate a pure frequency spectrum at 2.9938 GHz with 3.21 MW output power and 43.23% conversion efficiency, respectively. Finally, this megawatt asymmetrical resonant magnetron has been successfully applied in the medical linear accelerator.

Keywords:

• Asymmetry resonant
• strap break
• mode competition
• medical linear accelerator