【摘要】：建立了三維非線性返波互作用模型,用于精確分析大功率螺旋線行波管中返波振蕩非線性過(guò)程問(wèn)題,并提出了計(jì)算返波振蕩功率的方法及磁場(chǎng)抑制手段.該理論模型包括三維線路場(chǎng)方程、三維運(yùn)動(dòng)方程以及三維空間電荷場(chǎng).首先比較三維模型與原有一維模型之間的差異,發(fā)現(xiàn)一維空間電荷場(chǎng)的徑向交流電流分布模型與三維模型的差異是導(dǎo)致振蕩頻率偏大及起振長(zhǎng)度縮短的主要原因.然后計(jì)算返波飽和輸出功率大小并揭示返波飽和功率和振蕩頻率與互作用長(zhǎng)度的關(guān)系,并探討了磁場(chǎng)對(duì)返波振蕩的抑制影響.最后以某一毫米波行波管為例,實(shí)驗(yàn)對(duì)比了一維與三維模型計(jì)算的振蕩頻率與熱測(cè)的差異,其中三維模型的相對(duì)誤差小于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.
【作者單位】： 電子科技大學(xué)微波電真空器件國(guó)家級(jí)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):61201003,61301054)資助的課題~~
【分類(lèi)號(hào)】：TN124

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