BEPCⅡ直线加速器速调管的反射保护

王湘鉴; 张敬如; 裴士伦; 贺祥; 赵风利

doi:10.11884/HPLPB201931.180276

BEPCⅡ直线加速器速调管的反射保护

doi: 10.11884/HPLPB201931.180276

王湘鉴^{1, 2,},
张敬如¹,
裴士伦¹,
贺祥¹,
赵风利¹

1.
中国科学院高能物理研究所, 粒子加速物理与技术重点实验室, 北京 100049
2.
中国科学院大学, 北京 100049

基金项目:

国家自然科学基金项目 11475201

详细信息

作者简介:
王湘鉴(1984—)，男，高级工程师，主要从事直线加速器微波技术研究；wangxj@ihep.ac.cn

中图分类号: TL503
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出版历程
- 收稿日期: 2018-10-19
- 修回日期: 2019-01-18
- 刊出日期: 2019-02-15

Reflection protection of BEPCⅡ linear accelerator klystron

1.
Key Laboratory of Particle Acceleration Physics and Technology, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China

摘要

摘要: 为了使速调管陶瓷窗免受大功率微波反射信号的损伤，延长速调管使用寿命，要求当前反射信号功率超过阈值后，系统能够在下一个脉冲到达之前发出报警信号，进而切断触发信号，实现对速调管的保护。提出了3种较高性价比、易实施的方案，即PicoScope虚拟示波器的遮罩报警方案、基于自带检波和报警输出功能的芯片制作反射保护插件以及原功率计的升级改进。创新性地提出“3+1”反射保护响应时间测试法，并对上述3种方案进行详细测试。最终后两种方案取得较好的结果，综合考虑后，将改进型功率计作为最终实施方案。目前该改进型功率计已稳定可靠地上线运行超过1年。
- 速调管 /
- 陶瓷窗 /
- 功率计 /
- 反射保护 /
- 微波 /
- 虚拟示波器
Abstract: In the RF system of the accelerator, when the reflected power back to the klystron in the current RF pulse exceeds certain threshold, the system should send out an alarm signal before the next RF pulse arrives, and then cut off the trigger signal. By this way, the klystron ceramic window can be protected by reducing the damage caused by the high-power RF reflection; the online lifetime of the klystron can be prolonged. Three cost-effective and easy-to-implement solutions have been introduced: the mask alarm scheme by using the PicoScope virtual oscilloscope, the chip-made reflective protection plug-in based on the RF detection and alarm output functions, and the upgrade of the original RF power meter. The "3+1" reflection protection response time test method was innovatively proposed, it was used to thoroughly test the above three schemes. Finally, better results were obtained by using the latter two schemes. After comprehensive consideration, the upgraded RF power meter was used in the final implementation plan. At present, the upgraded RF power meter has been operating online stably and reliably for more than one year.
- klystron /
- ceramic window /
- RF power meter /
- reflection protection /
- microwave /
- virtual oscilloscope

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图 1 虚拟示波器PicoScope 3203D遮罩和报警设置

Figure 1. PicoScope 3203D mask and alarm settings

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图 2 LTC5564演示板

Figure 2. LTC5564 demo board

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图 3 改进型功率计的内部结构示意图

Figure 3. Internal structure of the upgraded RF power meter

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图 4 反射保护三种状态示意图

Figure 4. Schematic diagram of three typical reflection protection states

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图 5 一种基于功分器、微波开关的反射保护响应时间测试方法

Figure 5. A measurement method of reflection protection response time based on power divider and microwave switch

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图 6 改进型功率计在极端保护情况下反射保护响应时间测试

Figure 6. Improved power meters reflection protection response time test in extreme protection situations

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表 1 实验室50 Hz, 4 μs脉宽下三种方案的反射保护响应时间测试结果

Table 1. Reflection protection response time results of the three schemes tested at 50 Hz with 4 μs RF pulse width in the laboratory

	normal protection/ms	continuous protection/ms	extreme protection/ms
picoscope virtual oscilloscope	72	—	—
reflection protection plug-in	8×10^-5	7×10^-5	8×10^-5
upgraded RF power meter	5.2	5.5	5.9

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参考文献(10)

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