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对多注行波管周期永磁(PPM)聚焦结构中横向磁场的分布规律进行了研究,模拟分析了多注PPM聚焦系统中横向场的旋转对称特性,并对该系统中的电子流通率进行了分析。结果表明,单注PPM结构设计中普遍采用的横向磁场设计原则不适用于多注PPM聚焦结构,因为后者磁场的非旋转对称现象将随着电子通道内径向位置的增大而增强。本文针对多注PPM聚焦系统中横向磁场分布特点,提出了一种多注PPM聚焦磁场设计的一般性方法,首次将对磁场旋转对称性的判断纳入多注PPM磁场设计中。测试结果证明该方法对多注PPM聚焦磁场的设计提供了较好的指导作用。
The distribution law of transverse magnetic field in a multi-injection-wave-tube periodic permanent magnet (PPM) focusing structure is studied. The rotational symmetry characteristics of a transverse field in a multi-injection PPM focusing system are simulated and analyzed. The electron flow rate Analysis. The results show that the principle of transverse magnetic field commonly used in single-shot PPM structure design is not suitable for multi-shot PPM focusing structure because the non-rotational symmetry of the latter magnetic field will increase with the radial position of the electron channel. Aiming at the characteristics of transverse magnetic field in multi-injection PPM focusing system, this paper presents a general method for multi-injection PPM focusing magnetic field design. For the first time, the judgment of magnetic field rotational symmetry is incorporated into the design of multi-injection PPM magnetic field. The test results show that this method provides a good guidance for the design of multi-injection PPM focusing magnetic field.