Q Factor Measure and Calculate in SFC RF Cavity

• 作者: Wang Shixian Zhao Jianming Su Xuemin Wang Xianwu Yang Weiqing Zhang Zhiming
• 来源期刊: 近代物理研究所和兰州重离子加速器实验室年报：英文版
• 学科: 工学
• 关键词: Q值测量 高频腔 计算 SFC 射频发生器 佛罗里达州 证监会 功率损耗
• 年，卷（期）: 2004,（1）
• 页码范围: 155
• 页数: 1页
• 分类号: TL594

摘要

<正>Q factor is a main parameter of SFC RF cavity, it is related not only to RF power loss, but also high or low output power in RF generator and it directly affects RF generator. SFC accelerator vacuum-chamber has been improved, we have measured resonance frequency, situation of short-plate, reflect impedance and phase and calculated Q factor of SFC RF cavity. We used the method of capacitance coupling and frequency band to calculated Q factor, Q=Fo/(Fh-Fl), Fo, Fh, Fl are resonate frequency, upper frequency, down frequency of resonance point. Every point resonate frequency is got by changing Ld, Co, Cp. Here Ld is position of short-plate, Co is coupling capacity, Cp is compensating capacity. Test principle diagram is as follows (shown in Fig.1).