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收集效率和回流率是体现多级降压收集极性能的两个重要指标,本文尝试在收集极表面加上一定弧度的磁钢贴片,以此在收集极内引入非轴对称磁场,通过调节磁场的大小和位置,观察磁场对收集极内电子运动轨迹的影响,寻求实现收集极效率的最大化并抑制二次电子回流。针对某一Ku波段行波管多级降压收集极,加入优化磁场后的计算结果与未加磁场时相比,各电极电流分布发生变化,部分电子被更靠后的电极所收集,中频点处回流率由原来的2.49%降低到0.54%,同时收集效率提高超过3%达到79.07%。收集极性能的改善也为行波管效率的提高提供了保证。
The collection efficiency and the reflux rate are two important indexes that reflect the performance of multi-stage buck collector. In this paper, we try to add a certain radian magnetic steel patch on the collector surface to introduce a non-axisymmetric magnetic field in the collector, The size and position of the magnetic field are observed. The effect of the magnetic field on the trajectories of the electrons in the collector is observed, and the maximization of the collector efficiency and the suppression of the secondary electron backflow are sought. For a Ku-band traveling-wave tube multi-stage buck collector, the current distribution changes with the addition of the optimized magnetic field, and the partial electrons are collected by the more rearward electrodes. The intermediate frequency point The reflux rate decreased from 2.49% to 0.54%, while the collection efficiency increased more than 3% to 79.07%. The improvement of the collector performance also provides a guarantee for the improvement of traveling wave tube efficiency.