Design and test of permanent magnet used in high power microwave devices
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摘要: 报道了用于高功率相对论返波管振荡器的永磁体的设计和试制。以Halbach阵列结构为基础, 通过选择高性能的永磁材料, 调整磁钢的充磁方向、排列方式和尺寸, 优化设计了可用于某相对论返波管振荡器的永磁体结构, 其均匀区磁场强度0.98 T。采用粒子模拟方法, 进行了永磁体与返波管振荡器的一体化设计, 设计结果表明：器件输出功率超过1 GW, 设计的永磁体能够满足器件对磁场强度和位形的要求。对永磁体进行了试制和测试, 测试结果为：均匀区磁场0.88 T, 均匀区长110 mm, 磁体重量约306 kg。Abstract: A permanent magnet (PM) is one of the guiding magnet systems of high power microwave (HPM) sources. A relativistic backward wave oscillator (RBWO) packaged by the PM system has the advantages of compact structure, high efficiency and high repetition frequency. On the basis of the Halbach array, the theoretical design and the manufacture structure of the PM are proposed. The simulated magnetic flux density reaches 0.98 T, within a diameter of 50 mm. By employing the PIC simulation, the integrated design is carried out combining the PM and the RBWO. The output power of the RBWO is larger than 1 GW. Furthermore, the PM is manufactured and tested. The uniform length is 110 mm, the weight is 306 kg and the measured magnetic flux density is 0.88 T in center.
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