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为了满足载人航天用超小型脉冲栅控行波管阴极工作温度低、发射电流密度大、阴极活性好及可靠性高等技术要求,本文研制了一种具有NiReIr混合海绵及新型Ti粉激活剂贮存活性物质的新型贮存式氧化物阴极,测试了该阴极的发射性能。结果表明,新型阴极具有良好的发射性能在该行波管中应用脉冲宽度8～10μs,工作比1%,发射电流密度5～6A/cm2,寿命1000h;此外,为了缩短该阴极的启动时间对阴极结构及支撑带材料进行改进,改进后阴极加热功率3.6W在二极管试验中30s启动,成功用于某侦查卫星中。
In order to meet the requirements of man-made space-based ultra-small pulse gated traveling-wave tube cathode operating temperature is low, the emission current density, good cathode activity and high reliability requirements, this paper developed a NiReIr mixed sponge and a new Ti powder activator storage The new storage-type oxide cathode for active materials was tested for its emission performance. The results show that the new cathode has good emission performance. The pulse width is 8 ~ 10μs, the working ratio is 1%, the emission current density is 5 ~ 6A / cm2 and the lifetime is 1000h. In addition, in order to shorten the time Cathode structure and support strip material to improve the improved cathode heating power 3.6W 30s in the diode test start, successfully used in a detection satellite.