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首页> 外文学位 >Modeling and analysis of radio frequency structures using an equivalent circuit methodology with application to charged particle accelerator RF resonators.
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Modeling and analysis of radio frequency structures using an equivalent circuit methodology with application to charged particle accelerator RF resonators.

机译：使用等效电路方法对射频结构进行建模和分析，并应用于带电粒子加速器RF谐振器。

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摘要

The delineation of analysis techniques for high power radio frequency resonators, used as a fundamental component of particle accelerators, receives little attention in the literature. This dissertation reviews, describes, and develops techniques for resolving a transmission line mode rf resonator into an approximate equivalent circuit. Specifically, it presents a toolbox of techniques used to model and represent rf structures.; One technique develops models of transmission lines with varying characteristic impedance (referred to as non-uniform) using multiple series connected circuits consisting of lumped elements and constant impedance transmission lines based on a conserved energy approach. This technique is tested for exponentially tapered and linearly tapered quarter-wave resonators. Another technique developed, maps transmission lines with arbitrary cross-sections (referred to as nonstandard) to a standard structure that preserves the characteristic impedance and loss properties of the original line.; The techniques developed are applied to the analysis of the complex K1200 Superconducting Cyclotron rf resonators at the National Superconducting Cyclotron Laboratory (NSCL). The results predicted from the model are compared to measurements. The K1200 rf resonators are tunable over the frequency range of 9.5 to 27 MHz with tuning stems that vary from 300 cm to 11 cm respectively. The resonators are operated in the continuos wave (cw) mode and sustain peak voltages of up to 180 kV requiring drive power of up to 250 kW.; Using the techniques developed, the resonant frequency versus tuning stem position was predicted to within a positioning error that varied from 1 to 3.5 cm over the tuning range of 9.5 to 27 Mhz. The discrepancy between model predictions and the experimental data for the resonator power dissipation is postulated to be due to high surface resistance in regions where the rf surfaces were heavily worked or welded. After adjusting the surface resistance of these regions uniformly, the equivalent shunt circuit resistance was predicted accurately across the tuning range to within the maximum measurement accuracy of +/{dollar}-{dollar}5%.
机译：作为粒子加速器的基本组成部分的高功率射频谐振器的分析技术的描述在文献中很少受到关注。本文回顾，描述和发展了将传输线模式射频谐振器分解为近似等效电路的技术。具体来说，它提供了用于建模和表示RF结构的技术工具箱。一种技术基于保守的能量方法，使用由集总元件和恒定阻抗传输线组成的多个串联电路，开发出具有变化的特征阻抗（称为不均匀）的传输线模型。该技术已针对指数锥形和线性锥形四分之一波长谐振器进行了测试。开发的另一种技术是将具有任意横截面（称为非标准）的传输线映射到保留原始线的特征阻抗和损耗特性的标准结构。在国家超导回旋加速器实验室（NSCL），所开发的技术被用于分析复杂的K1200超导回旋加速器rf谐振器。将模型预测的结果与测量结果进行比较。 K1200 rf谐振器可在9.5至27 MHz的频率范围内进行可调，其调谐杆分别在300 cm至11 cm之间变化。谐振器以连续波（cw）模式工作，并维持最高180 kV的峰值电压，需要高达250 kW的驱动功率。使用开发的技术，可以预测共振频率与音调杆位置的关系在9.5至27 Mhz的音调范围内，定位误差在1至3.5 cm之间。假设谐振腔功率耗散的模型预测与实验数据之间存在差异，是由于在射频表面被大量加工或焊接的区域中的高表面电阻所致。在均匀调整这些区域的表面电阻后，可以在整个调谐范围内准确预测等效分路电路电阻，使其在最大测量精度为+/- 5％至5％之间。

著录项

  • 作者

    Vincent, John J.;

  • 作者单位

    Michigan State University.;

  • 授予单位 Michigan State University.;
  • 学科 Engineering Electronics and Electrical.; Physics Electricity and Magnetism.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 219 p.
  • 总页数 219
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;电磁学、电动力学;
  • 关键词

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