各向异性铁氧体速调管束流聚焦系统性能评价
Performance Evaluation of Klystron Beam Focusing System with Anisotropic Ferrite Magnet
摘要：
本文报道了一种采用永磁体的速调管束流聚焦系统，它比电磁聚焦系统可靠性高。为评价永磁体聚焦系统的可行性，设计并制作了一台1.3 GHz、800 kW速调管的样机。为了降低生产成本和减轻复杂的磁场调谐过程，采用各向异性铁氧体磁体作为磁性材料。作为功率测试的结果，使用原型聚焦系统成功地实现了798 kW的峰值输出功率。考虑到电磁体聚焦系统的功率消耗，利用永磁体系统产生标称800 kW输出功率所需的壁插功率小于利用电磁体的壁插功率。然而，发现具有永磁体系统的速调管的功率转换效率受到横向多极磁场的限制。通过减小横向多极磁场分量，特别是偶极子和四极子，功率转换效率将接近电磁铁。
英文摘要：
A klystron beam focusing system using permanent magnets, which increases reliability in comparison with electromagnet focusing system, is reported. A prototype model has been designed and fabricated for a 1.3 GHz, 800 kW klystron for evaluation of the feasibility of the focusing system with permanent magnets. In order to decrease the production cost and to mitigate complex tuning processes of the magnetic field, anisotropic ferrite magnet is adopted as the magnetic material. As the result of a power test, 798 kW peak output power was successfully achieved with the prototype focusing system. Considering a power consumption of the electromagnet focusing system, the required wall-plug power to produce nominal 800 kW output power with the permanent magnet system is less than that with electromagnet. However, the power conversion efficiency of the klystron with the permanent magnet system was found to be limited by transverse multipole magnetic fields. By decreasing transverse multipole magnetic field components, especially the dipole and the quadrupole, the power conversion efficiency would approach to that with electromagnets.
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