A new tuning method based on quantitative compensation for uniform and non-uniform travelling-wave accelerating structures

IF 4.6 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2025-06-18 DOI:10.1016/j.rinp.2025.108337

Yu Yang, Bo Wang, Jinghe Yang, Aijun Cui, Yuepeng Lv, Cheng Qin, Yihuai Xiang, Lifeng Zhang, Zhibin Zhu

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Abstract

In this paper, a new tuning method based on quantitative compensation for both uniform and non-uniform structures is proposed after analyzing the relationship between field distribution and RF parameters of each cavity based on the equivalent circuit model. Using field distributions measured when RF power is fed respectively into input and output ports, the frequency deviation of each cavity and both input and output coupling coefficients of the structure can be calculated quantitatively. The reflection caused by coupling coefficient deviation can be eliminated by detuning coupler cavity and the adjacent cavity quantitatively. And the frequency deviation, which is usually tuned by the tuning hole on the cavity, can be also compensated quantitatively by detuning the adjacent cavities especially when it’s not convenient or too large to be tuned by the tuning hole. A S-band non-uniform travelling wave accelerating structure has been tuned successfully with this method. The field distribution is tuned to be close to the design, the VSWR at the operating frequency is minimized to 1.0056 and these results verify the effectiveness of this method

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基于定量补偿的均匀和非均匀行波加速结构调谐新方法

本文在等效电路模型的基础上，分析了各空腔的场分布与射频参数的关系，提出了一种基于定量补偿的均匀和非均匀结构的调谐方法。利用射频功率分别输入和输出端口时测量的场分布，可以定量计算出每个腔的频率偏差以及结构的输入和输出耦合系数。耦合系数偏差引起的反射可以通过对耦合腔和相邻腔进行定量失谐来消除。频率偏差通常通过腔上的调谐孔进行调谐，当调谐孔不方便或调谐太大时，也可以通过对相邻腔进行调谐来定量补偿。用该方法成功地调谐了一个s波段非均匀行波加速结构。调整后的场分布接近设计值，工作频率下的驻波比降至1.0056，验证了该方法的有效性

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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