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周期永磁聚焦行波管特性最严重和最主要的限制是由于一些零散电子注的截获而在高频结构上引起的过量热耗散。电子注聚焦质量很大程度上决定于铝镍钴(Alnico)一类永久磁体的性能。采用稀土钴合金以后,周期磁聚焦行波管的特性将会有所突破。本文描述了一个用钐钴磁铁聚焦的行波管,在百分之十的工作比下得到2千瓦的输出功率。利用普通的螺旋线慢波结构,管子覆盖着3.5～10.6千兆赫超过倍频程的频率范围。在负载驻波比达10:1时仍能获得良好的工作。这类磁铁由稀土钴粉末合金经下列过程制成的:粉末配制,磁埸定向,压制,烧结和磁化。用于这类管子的磁铁,其磁能积已大于15兆高一奥。
The most serious and the most important limitation of periodic PMF characteristics is the excess heat dissipation caused by the high frequency structure due to the interception of some scattered electrons. The quality of the electron beam focus is largely determined by the properties of a permanent magnet such as Alnico. After the use of rare earth cobalt alloy, the characteristics of periodic magnetic focusing TWT will be a breakthrough. This article describes a traveling-wave tube focused with a samarium-cobalt magnet, yielding 2 kW of output power at a 10% duty cycle. Using a common spiral slow-wave structure, the tube covers a frequency range of more than octave 3.5 to 10.6 GHz. Good load-to-wave ratio up to 10: 1 still get good work. This type of magnet is made of a rare earth cobalt powder alloy by the following process: powder preparation, magnet orientation, pressing, sintering and magnetization. Magnets used for this type of tube have a magnetic energy product of more than 15 megawatts.