双束回旋行波放大器的研究

A TWO\|STREAM GYROTRON TRAVELLING WAVE AMPLIFIER

提出了运用双束电子束增加回旋行波放大器带宽的新想法，建立了模型并对其做了理论分析和数值模拟．研究表明：该模型不仅可产生宽的输出带宽和高的输出功率，且与已有宽带模型相比，增益要高得多．当两束电子束的电流均为１０ Ａ，电压分别为９０ 和１５３ ｋＶ，速率比分别为１０ 和０６２ ，纵向动量散度分别为５５ ％ 和１２ ％ 时，器件输出的饱和带宽至少可达到２２ ％ ，峰值功率和指数增益分别为３９５ ｋ Ｗ 和６２ ｄＢ，效率为１６ ％ ；如果在相互作用区的末段对引导磁场进行弱的锥化，可以得到约２３ ％ 的常量驱动带宽，输出功率仍有２８０ ｋ

A new idea of using two electron beams to widen the bandwidth of a Gyro\|TWA is put forward.Theoretical and numerical investigations show that:the new model can produce wideband and high\|power output,and its gain is much higher compared with the existing wideband model.When the current of the two beams is 10?A,their voltage are,respectively,90 and 153?kV,the velocity ratio are 1.0 and 0.62,and their axial momentum spreads are 5.5% and 1.2%,the output saturated bandwidth can reach at least 22%,the peak power,efficiency and gain are 395?kW,16% and 62?dB,respectively.If we taper the axial guiding magnetic field at the end of the interaction region,a constant bandwidth of 23% can be achieved with the peak output power 280?kW.