| 铁磁性加载复合管壳电子注聚焦性能的研究 |
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| 引用本文： | 刘洋,魏义学,史雪春,费娜,邱立,王严梅.铁磁性加载复合管壳电子注聚焦性能的研究[J].强激光与粒子束,2023,35(2):023008-1-023008-6. |
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| 作者姓名： | 刘洋 魏义学 史雪春 费娜 邱立 王严梅 |
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| 作者单位： | 中国电子科技集团公司 第十二研究所，北京 100015 |
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| 摘 要： | 大功率行波管通常利用复合管壳提升高频系统的集成度和散热特性。宽带行波管采用复合管壳高频制造工艺时,由于加载翼片含有铁磁性材料(纯铁)使得聚焦系统的横向磁场分量变大,径向和角向磁场分量呈非均匀性,电子注聚焦困难。本文研究了周期永磁聚焦系统横向磁场产生的原因并建立理论模型,并对磁场分量和其对电子注形态的影响进行了仿真,仿真结果与理论计算结果一致。根据横向磁场分布模型对加载翼片的形状和数量进行优化仿真,结果表明9片齿形加载翼片方案可在保持慢波电路参数的同时,降低聚焦系统的横向磁场分量,改善电子注聚焦效果。
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| 关 键 词： | 行波管 铁磁性 复合管壳 周期永磁聚焦系统 横向磁场 电子注 |
| 收稿时间： | 2022-10-14 |
Study of electron beam focusing performance of ferromagnetic material loaded compound pipe shell |
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| Affiliation: | The 12th Research Institute of China Electronics Technology Group Corporation, Beijing 100015 , China |
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| Abstract: | High power traveling wave tubes (TWTs) usually use compound pipe shells to enhance the integration and heat dissipation characteristics of high frequency system. When broadband TWT adopts the compound pipe shell high frequency manufacturing process, the vane load contains ferromagnetic material (pure iron), which makes the transverse magnetic field component of the focusing system become larger, radial and angular magnetic field components being non-homogeneous, resulting in the difficulty of electron beam focusing. This paper studies the causes of transverse magnetic field generation in periodic permanent magnet (PPM) focusing system and establishes theoretical model and simulates the transverse magnetic field component’s effect on the morphology of electron beam. The simulation results are consistent with the theoretical model. The optimized combination of shape and number of vanes based on the theoretical model shows that the 9 tooth-shaped loaded vanes can maintain slow-wave circuit parameters while reducing transverse magnetic field component of the focusing system, improving the focusing performance of electron beam. |
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