螺旋线行波管三维返波互作用理论与数值模拟
发布时间：2018-10-17 09:30
【摘要】：建立了三维非线性返波互作用模型,用于精确分析大功率螺旋线行波管中返波振荡非线性过程问题,并提出了计算返波振荡功率的方法及磁场抑制手段.该理论模型包括三维线路场方程、三维运动方程以及三维空间电荷场.首先比较三维模型与原有一维模型之间的差异,发现一维空间电荷场的径向交流电流分布模型与三维模型的差异是导致振荡频率偏大及起振长度缩短的主要原因.然后计算返波饱和输出功率大小并揭示返波饱和功率和振荡频率与互作用长度的关系,并探讨了磁场对返波振荡的抑制影响.最后以某一毫米波行波管为例,实验对比了一维与三维模型计算的振荡频率与热测的差异,其中三维模型的相对误差小于4.8%.
[Abstract]:A three-dimensional nonlinear back-wave interaction model is established to accurately analyze the nonlinear process of the back-wave oscillation in a high-power helical traveling wave tube. A method for calculating the power of the back-wave oscillation and a magnetic field suppression method are proposed. The theoretical model includes three dimensional line field equation, three dimensional motion equation and three dimensional space charge field. It is found that the difference between the radial AC current distribution model of one-dimensional space charge field and the three-dimensional model is the main reason for the large oscillation frequency and the shortening of the starting length. Then the saturation output power of the backwave is calculated and the relationship between the saturation power and the oscillation frequency and the interaction length is revealed and the influence of the magnetic field on the suppression of the backwave oscillation is discussed. Finally, taking a millimeter wave traveling wave tube as an example, the difference between the oscillation frequency and the thermal measurement calculated by one dimensional and three dimensional models is compared experimentally, in which the relative error of the three dimensional model is less than 4.8.
【作者单位】： 电子科技大学微波电真空器件国家级重点实验室;
【基金】：国家自然科学基金(批准号:61201003,61301054)资助的课题~~
【分类号】：TN124
本文编号：2276235
[Abstract]:A three-dimensional nonlinear back-wave interaction model is established to accurately analyze the nonlinear process of the back-wave oscillation in a high-power helical traveling wave tube. A method for calculating the power of the back-wave oscillation and a magnetic field suppression method are proposed. The theoretical model includes three dimensional line field equation, three dimensional motion equation and three dimensional space charge field. It is found that the difference between the radial AC current distribution model of one-dimensional space charge field and the three-dimensional model is the main reason for the large oscillation frequency and the shortening of the starting length. Then the saturation output power of the backwave is calculated and the relationship between the saturation power and the oscillation frequency and the interaction length is revealed and the influence of the magnetic field on the suppression of the backwave oscillation is discussed. Finally, taking a millimeter wave traveling wave tube as an example, the difference between the oscillation frequency and the thermal measurement calculated by one dimensional and three dimensional models is compared experimentally, in which the relative error of the three dimensional model is less than 4.8.
【作者单位】： 电子科技大学微波电真空器件国家级重点实验室;
【基金】：国家自然科学基金(批准号:61201003,61301054)资助的课题~~
【分类号】：TN124
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