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返波管是宽频带调谐器件,其慢波电路的加速电压在一个很宽的范围内是可调的.因而要求电子枪的电流受慢波系统加速电压的影响尽量小,以减小工作频带内的功率起伏.返波管电子枪多采用双阳极补偿电子枪或三阳极补偿电子枪.它们可以大大减小加速电压对枪电流的影响.为了进一步提高返波管的耦合阻抗,往往采用空心注电子枪.空心注还具有导流系数大、效率高、频带宽的优点,对缩小器件尺寸、减轻器件重量有很大意义.空心注使得阳极耐离子轰击,可提高阴极寿命,降低离子噪声.
The return wave tube is a wide band tuning device whose accelerating voltage of the slow wave circuit is adjustable over a wide range and therefore the current of the electron gun is required to be as small as possible by the accelerating voltage of the slow wave system so as to reduce the operating frequency band Of the power fluctuations.Radio-tube electron guns and more use of double anode compensation electron gun or three anode compensation electron gun.They can greatly reduce the acceleration voltage on the gun current.In order to further improve the back-wave tube coupling impedance, often using hollow injection electron gun hollow Note also has the diversion coefficient, high efficiency, the advantages of bandwidth, the device size to reduce the weight of the device has great significance. Hollow Note ion bombardment of the anode can improve cathode life, reduce ion noise.