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在脉冲磁控管中,阳极电流可以用两个不同的公式表示。一是属于具体管型的,包含电磁参数和管的几何尺寸,它描述阳极如何从切向迴旋的电子云中提取电子。另一个只与阴极的热发射、回轰系数和次级发射系数有关,它描述阴极向迴旋电子云供应电子的一般方式。二者有紧密的联系,但又是不同的物理过程。我们将这两个公式和互作用空间中的电子云运动结合起来,便能更好地了解磁控管的工作机制。 为了使磁控管能稳定工作,就要使预振电压低于门槛电压,并且使空间电荷振荡的模式与谐振腔上高频振荡的π模同步。在起振之后,阳极电流应近似地由次级发射供应,而回轰电流则近似地由热发射供应。此条牛能保证得到较好的工作状态。
In a pulsed magnetron, the anode current can be expressed in two different formulas. One is tube-specific and contains the electromagnetic parameters and geometry of the tube, which describes how the anode extracts electrons from the tangential electron cloud. The other is related only to the cathode’s thermal emission, backflush coefficient and secondary emission coefficient, which describes the general way that the cathode supplies electrons to the cyclotron cloud. The two are closely linked, but they are different physical processes. We combine these two equations with the movement of the electron cloud in the interaction space to get a better understanding of how the magnetron works. In order for the magnetron to work stably, the pre-excitation voltage should be lower than the threshold voltage, and the mode of space charge oscillation should be synchronized with the π mode of high-frequency oscillation on the resonant cavity. After start-up, the anode current should be approximately supplied by the secondary emission, while the return current is supplied approximately by the thermal emission. This cow can guarantee a better working condition.