The design of Hefei advanced light facility timing system

Gangjia ZHAI; Xiaokang SUN; Ke XUAN; Liuguo CHEN; Chuan LI; Gongfa LIU

doi:10.11889/j.0253-3219.2022.hjs.45.120102

Journals >NUCLEAR TECHNIQUES >Volume 45 >Issue 12 >Page 120102 > Article

NUCLEAR TECHNIQUES
Vol. 45, Issue 12, 120102 (2022)

The design of Hefei advanced light facility timing system

Gangjia ZHAI, Xiaokang SUN, Ke XUAN, Liuguo CHEN, Chuan LI^*, and Gongfa LIU

Author Affiliations

National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China

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DOI: 10.11889/j.0253-3219.2022.hjs.45.120102 Cite this Article

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 Copy Citation Text

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Fig. 1. Layout of HALF

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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. 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)

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Fig. 3. Hardware structure diagram of timing system

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Fig. 4. Schematic diagram of arbitrary bucket filling in storage ring

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Fig. 5. Software design of timing system

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Fig. 6. Operation interface of timing system

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Fig. 7. Hardware structure diagram of the prototype system (a) and photo of a prototype system (b)

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Fig. 8. Jitter result of RF clock (arrows point to enlarged test results)

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Fig. 9. Oscilloscope output without DC (a) and with DC (b) (arrows point to enlarged test results)

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Fig. 10. Graph of optical fiber transmission delay with temperature

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Fig. 11. Measurements of delay adjustment (a) and delay range (b) (arrows point to enlarged test results)

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Fig. 12. Test result of delay adjustment (a) and test result of pulse width adjustment (b)

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Fig. 13. Measurements of the first four pulse width adjustment range (a) and other pulses width range (b) (arrows point to enlarged test results)

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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 1. Design specifications of HALF timing system

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 2. The timing system of some accelerator facilities

参数 Parameters	方案一 Option one	方案二 Option two
电子枪激光频率 $f_{L a s e r}$ E-Gun laser frequency $f_{L a s e r}$	83.3 MHz	79.333 MHz
直线加速器微波频率 $f_{M o d u}$ Linac microwave frequency $f_{M o d u}$	2 998.8 MHz	2 856 MHz
储存环高频腔频率 $f_{R f}$ Storage Ring RF Frequency $f_{R f}$	499.8 MHz	499.8 MHz
谐波数H Harmonic numberH	799	800

Table 3. Two frequency design schemes of injection and storage ring

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 4. Event code distribution of timing system

测试项 Test items	无DC Without DC / ns	有DC With DC / ns
$t_{1}$	$5.166 0 \times 10^{2}$	$2.347 0 \times 10^{- 1}$
$t_{2}$	$- 5.161 4 \times 10^{2}$	$2.286 0 \times 10^{- 1}$
系统误差System error	$2.300 0 \times 10^{- 1}$	$2.316 5 \times 10^{- 1}$
信号漂移Signal drift	$5.163 7 \times 10^{2}$	$3.050 0 \times 10^{- 3}$

Table 5. Test results of DC

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

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