In order to enhance the output power of gyrotrons and meet the demands of plasma heating and other fields,a 220GHz planar gyrotron is designed.The numerical simulation method for a multi-mode time-domain model of the planar gyrotron is introduced,and the MATLAB is used to optimize the pro-gramming.Ultimately,the transverse interaction efficiency reaches 36.6％,the total interaction efficiency reaches 25.4％.The mode field is uniformly distributed along the lateral direction,achieving lateral energy output with an output power of 142kW.Compared with the numerical simulation results of 220GHz cylin-drical gyrotrons,the output power of the planar gyrotron is increased by an order of magnitude.
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