NUCLEAR TECHNIQUES, Volume. 45, Issue 12, 120102(2022)
The design of Hefei advanced light facility timing system
Figures & Tables(18)
Fig. 2. Schematic diagram of the actual working sequence of each subsystem after receiving the trigger from the timing system (the horizontal axis only represents the chronological order)
Fig. 4. Schematic diagram of arbitrary bucket filling in storage ring
Fig. 7. Hardware structure diagram of the prototype system (a) and photo of a prototype system (b)
Fig. 8. Jitter result of RF clock (arrows point to enlarged test results)
Fig. 9. Oscilloscope output without DC (a) and with DC (b) (arrows point to enlarged test results)
Fig. 10. Graph of optical fiber transmission delay with temperature
Fig. 11. Measurements of delay adjustment (a) and delay range (b) (arrows point to enlarged test results)
Fig. 12. Test result of delay adjustment (a) and test result of pulse width adjustment (b)
Fig. 13. Measurements of the first four pulse width adjustment range (a) and other pulses width range (b) (arrows point to enlarged test results)
Table 1. Design specifications of HALF timing system
View tableView in ArticleTable 1. Design specifications of HALF timing system
触发信号的抖动
Jitter of trigger signals
<30 ps 触发信号延迟的调节步长
Delay adjustment length of trigger signals
<10 ns 触发信号延迟的范围
Delay range of trigger signals
≥1 s 触发信号脉宽的调节步长
Pulse width adjustment length of trigger signals
20 ns 触发信号脉宽的范围
Pulse width range of trigger signals
≥60 μs
Table 2. The timing system of some accelerator facilities
View tableView in ArticleTable 2. The timing system of some accelerator facilities
装置
Facilities
技术路线
Technical route
建成年份
Completion date of construction
MAX IV Event timing 2016 Sirius Event timing 2019 ESRF-EBS White Rabbit 2019 HEPS Event timing 建设中 Under construction APS-U Event timing 建设中 Under construction SHINE White Rabbit 建设中 Under construction
Table 3. Two frequency design schemes of injection and storage ring
View tableView in ArticleTable 3. Two frequency design schemes of injection and storage ring
参数 Parameters 方案一 Option one 方案二 Option two 电子枪激光频率 E-Gun laser frequency 83.3 MHz 79.333 MHz 直线加速器微波频率 Linac microwave frequency 2 998.8 MHz 2 856 MHz 储存环高频腔频率 Storage Ring RF Frequency 499.8 MHz 499.8 MHz 谐波数H Harmonic numberH 799 800
Table 4. Event code distribution of timing system
View tableView in ArticleTable 4. Event code distribution of timing system
事件码 Event codes 功能 Functions 0x00 空事件信号 Null event signal 0x01 光阴极微波电子枪的触发信号 Trigger signal of photocathode RF electron gun 0x02 热阴极电子枪的触发信号 Trigger signal of thermionic cathode electron gun 0x03 调制器等注入设备的触发信号 Trigger signal of injection devices such as modulator 0x04 直线加速器束流测量设备的触发信号 Trigger signal of beam diagnostics devices at Linac 0x05 储存环束流测量设备的触发信号 Trigger signal of beam diagnostics devices in storage ring 0x7E 延迟补偿信号 Delay compensation signal 0x7F 序列结束信号 End of sequence signal
Table 5. Test results of DC
View tableView in ArticleTable 5. Test results of DC
测试项
Test items
无DC
Without DC / ns
有DC
With DC / ns
系统误差System error 信号漂移Signal drift
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Gangjia ZHAI, Xiaokang SUN, Ke XUAN, Liuguo CHEN, Chuan LI, Gongfa LIU. The design of Hefei advanced light facility timing system[J]. NUCLEAR TECHNIQUES, 2022, 45(12): 120102
Paper Information
Category: Research Articles
Received: Jul. 25, 2022
Accepted: --
Published Online: Jan. 3, 2023
The Author Email: LI Chuan (lichuan@ustc.edu.cn)
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