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前言在周期永磁聚焦的行波管中为了减小电子注的脉动,希望尽量缩小周期。过去由于受永磁材料性能的限制,很难将周期缩得很短。自从钐钴磁钢问世以来,由于其优越的磁性能,使这一问题得到了突破。相应地对于聚焦系统的结构也提出了新的要求。我们曾在一个行波管上试验了周期为7.9毫米的平极靴周期永磁聚焦系统并获得成功。本文介绍此种结构的理论分析及由此所得到的工程计算公式,同时给出实验结果。
Preface In order to reduce the pulsation of the electron beam in a traveling wave tube with periodic PM focusing, it is desirable to minimize the period. In the past due to the performance constraints of permanent magnetic materials, it is difficult to shorten the cycle. Since the advent of SmCo magnets, this problem has been overcome due to its superior magnetic properties. Accordingly, new demands have also been placed on the structure of the focusing system. We tested the success of a flat-pole periodical permanent magnet focusing system with a period of 7.9 mm on a traveling-wave tube. This paper introduces the theoretical analysis of the structure and the resulting engineering calculation formula, and gives the experimental results.