本文關鍵詞： 多間隙耦合腔 諧振頻率 特性阻抗 模式重疊 穩(wěn)定性　出處：《北方工業(yè)大學》2017年碩士論文　論文類型：學位論文

【摘要】：分布互作用速調管是在傳統(tǒng)速調管中引入多間隙耦合腔,分布互作用速調管更容易在高頻段獲得更大的輸出功率、增益和帶寬能夠滿足現代設備的需求。多間隙耦合腔是分布互作用速調管發(fā)展的一項關鍵技術。本文圍繞多間隙耦合腔電磁仿真與設計這一重要主題,基于現有等效電路、微波網絡基本原理和空間電荷波基本理論,運用三維電磁仿真軟件圍繞耦合腔中諧振頻率、特性阻抗、模式重疊及其穩(wěn)定性展開理論分析和數值模擬,主要開展了以下幾方面的工作:1.從微波網絡基本原理出發(fā),結合諧振腔等效電路的研究方法,得到了多間隙耦合腔等效電路基本模型。以三間隙休斯結構耦合腔為例,分析三間隙休斯結構耦合腔各個模式諧振頻率及其特性阻抗隨耦合槽諧振頻率和耦合系數變化規(guī)律。2.運用三維電磁仿真軟件,通過調整耦合槽結構尺寸及其位置,計算各個模式諧振頻率及其對應特性阻抗,結果發(fā)現耦合槽角度對于模式頻率分布及其特性阻抗數值起著主導作用,耦合槽位置對各個模式特性阻抗影響較大,耦合槽寬度主要影響各個模式諧振頻率的間隔大小。3.結合耦合腔中不同模式的冷參特性與結構尺寸變化規(guī)律,從諧振頻率和特性阻抗角度出發(fā),最終優(yōu)化得到在耦合角度在105°,前三個模式(-π模、-π/2模、2π模)重疊,耦合角度在225°后三個模式(π模、π/2模、2π模)重疊狀態(tài),對應特性阻抗幅值相對較大。4.基于空間電荷波理論得到多間隙耦合腔電子注電導的計算公式,根據三維電磁仿真軟件得到三間隙休斯結構耦合腔中各個模式的特性阻抗,通過計算各個模式電子注的品質因數倒數,在三間隙耦合腔在兩種多模式重疊前提下,分析了各個模式的隨直流電壓變化曲線,指出注-波同步作用是實現其穩(wěn)定工作的關鍵因素,選擇工作電壓20kV可以實現三個工作模式穩(wěn)定工作,寄生模式也容易得到抑制。
[Abstract]:The distributed interaction klystron is a multi-gap coupling cavity introduced into the traditional klystron. It is easier for the distributed interaction klystron to obtain more output power in the high frequency band. Gain and bandwidth can meet the needs of modern equipment. Multi-gap coupled cavity is a key technology in the development of distributed interaction klystron. This paper focuses on the electromagnetic simulation and design of multi-gap coupled cavity. Based on the existing equivalent circuit, microwave network principle and space charge wave theory, the resonant frequency and characteristic impedance in the coupling cavity are simulated by three-dimensional electromagnetic simulation software. The theoretical analysis and numerical simulation of mode overlap and its stability are mainly carried out in the following aspects: 1. Starting from the basic principle of microwave network and combining with the research method of resonant cavity equivalent circuit. The equivalent circuit model of multi-gap coupled cavity is obtained. The three-gap Hughes structure coupling cavity is taken as an example. The resonant frequency and characteristic impedance of the three-gap Hughes structure coupled cavity are analyzed with the change of resonant frequency and coupling coefficient. 2. Three-dimensional electromagnetic simulation software is used to simulate the resonant frequency and the characteristic impedance of the coupling cavity. By adjusting the structure size and position of the coupling slot, the resonant frequency and its corresponding characteristic impedance of each mode are calculated. The results show that the angle of the coupling slot plays a leading role in the mode frequency distribution and the value of the characteristic impedance. The coupling slot position has a great influence on the impedance of each mode, and the width of the coupling slot mainly affects the interval between the resonant frequencies of each mode. 3. Combining the cold parameter characteristics of different modes in the coupling cavity and the variation of structure size. From the angle of resonant frequency and characteristic impedance, it is finally optimized that the first three modes are overlapped at 105 擄and the first three modes-蟺 / 2 mode / 2 蟺 mode). The three modes (蟺 mode, 蟺 / 2 mode and 2 蟺 mode) overlap at 225 擄. The corresponding characteristic impedance amplitude is relatively large. 4. Based on the space charge wave theory, the formula for calculating the electron beam conductance of multi-gap coupled cavity is obtained. According to the three-dimensional electromagnetic simulation software, the characteristic impedance of each mode in the three-gap Hughes structure coupling cavity is obtained, and the inverse of the quality factor of each mode electron beam is calculated. Under the premise of two kinds of multi-mode overlap, the curves of each mode with DC voltage are analyzed, and it is pointed out that the synchronous beam-wave action is the key factor to realize the stability of the cavity. The operation voltage of 20kV can work stably in three modes, and the parasitic mode can be easily suppressed.
【學位授予單位】：北方工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN122

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