Efficiency Optimization of an L-band Continuous-wave Magnetron
In the development process of an L-band continuous-wave magnetron,it is found that the anode current is relatively high,the parasitic current is excessively high,and the efficiency is much lower than the theo-retical calculation value.In the operation of a magnetron,the sympathetic space electron cloud,cathode,and resonant cavity are interdependent and mutually restrictive,making the efficiency improvement a complex prob-lem.Two measures are taken to optimize the electronic efficiency of the magnetron,including fine-tuning the magnetic induction intensity by surface coating on magnet steel and improving the carbonization process of the thorium tungsten cathode.By changing the end structure of the antenna output section,the appearance quality factor Qe between the antenna and the waveguide excitation cavity is reduced,and the circuit efficiency of the magnetron is optimized.On the basis of a 10.6％increase in electronic efficiency,further circuit efficiency opti-mization results in a 6.4％increase in the overall efficiency of the continuous-wave magnetron.The continuous-wave magnetron has an output power of 1350 W at a working voltage of 4 kV.The anode current decreases from 596 mA to 465 mA,and the overall efficiency increases significantly from the initial 55.8％to 72.6％.
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