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问题的提出许多有关磁控管的文献书籍在分析不计空间电荷和高频场的电子运动时,一般都假定电子初速为零和初位置为零,这样得出的电子轨迹方程结构形式简单,所表示的物理图象清晰,使用方便。但这毕竟是一种特例,不能以偏概全,因此有它的局限性。有的磁控管文献解出了初速不为零、初位置不为零的电子轨迹,得到一组冗长的数学表达式,而且不易看出它所反映的物理图象,使用不
PROBLEM PROBLEMS Many literatures related to magnetrons generally assume that the electron velocity is zero and the initial position is zero when analyzing electron motion without regard to space charge and high-frequency fields. The resulting electronic trajectory equation has a simple structure Said the physical image is clear, easy to use. But after all, this is a special case, can not be over-general, so it has its limitations. Some literatures of magnetrons solve the electron trajectory with non-zero initial velocity and non-zero initial position, and obtain a set of lengthy mathematical expressions, and it is not easy to see the physical image it reflects.