The design and analysis of a novel multistage depressed collector for gyro-TWT

A novel method of spatial separation of electrons with different initial energies in the helical electron beams of gyro-traveling wave tube (gyro-TWT), configured by two orthogonal external transverse magnetic fields, is presented. To demonstrate the method, an advanced asymmetric two-stage depressed collector has been designed. The structure of the collector and the electronic classification method are analyzed in detail in this article. The simulation shows that the application of this method can realize electronic classification effectively. The overall efficiency of the gyro-TWT improved from 32.6% to 55.7% and increased by 70.8%. The maximum power dissipation and the maximum thermal loading on the electrode were 2.12 kW/cm2 and 299 °C, respectively. The secondary electron analysis shows that the rectangular groove on the electrode surface can effectively suppress the influence of secondary electrons on the collector's efficiency.