Multi-frequency point supported LLRF front-end for CiADS
wide-bandwidth application

doi:10.1007/s41365-020-0733-9

Nuclear Science and Techniques ›› 2020, Vol. 31 ›› Issue (3): 29 doi: 10.1007/s41365-020-0733-9

• ACCELERATOR, RAY AND APPLICATIONS • Previous Articles Next Articles

Multi-frequency point supported LLRF front-end for CiADS wide-bandwidth application

Qi Chen^1,2 • Zheng Gao¹ • Zheng-Long Zhu¹ • Zong-Heng Xue¹ • Yuan He¹ • Xian-Wu Wang¹

¹ Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
² School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China

Received:2019-11-11 Revised:2019-12-20 Accepted:2020-01-11
Contact: Yuan He E-mail:hey@impcas.ac.cn
Supported by:
The multi-frequency supported front-end prototype was guided and supported by Lawrence Doolittle, Gang Huang, Derun Li, and John Byrd from LBNL, and benefited from Lawrence Doolittle’s and Gang Huang’s valuable comments and suggestions on the design. Thanks to Derun Li and John Byrd’s project financial support.

Export Citation

Qi Chen, Zheng Gao, Zheng-Long Zhu, Zong-Heng Xue, Yuan He, Xian-Wu Wang. Multi-frequency point supported LLRF front-end for CiADS wide-bandwidth application.Nuclear Science and Techniques, 2020, 31(3): 29 doi: 10.1007/s41365-020-0733-9

Citations

Altmetrics

Abstract

Abstract: The China initiative Accelerator Driven System, CiADS, physics design adopts 162.5 MHz, 325 MHz, and 650 MHz cavities, which are driven by the corresponding radio frequency (RF) power system, requiring frequency translation front-end for the RF station. For that application, a general-purpose design front-end prototype has been developed to evaluate the multi-frequency point supported design feasibility. The difficult parts to achieve the requirements of the general-purpose design are reasonable device selection and balanced design. With a carefully selected low-noise wide-band RF mixer and amplifier to balance the performance of multi-frequency supported down-conversion, specially designed LO distribution net to increase isolation between adjacent channels, and external band-pass filter to realize expected up-conversion frequencies, high maintenance and modular front-end general-purpose design has been implemented. Results of standard parameters show an 𝑅² value of at least 99.991% in the range of − 60–10 dBm for linearity, up to 18 dBm for P1dB, and up to 89 dBc for cross talk between adjacent channels. The phase noise spectrum is lower than 80 dBc in the range of 0–1 MHz; cumulative phase noise is 0.006°; and amplitude and phase stability are 0.022% and 0.034°, respectively.

Key words: Frequency jump, RF Front-end, LLRF, CiADS

[1]	Cheng-Cheng Xiao, Jun-Qiang Zhang, Jian-Hao Tan, Wen-Cheng Fang. Design and preliminary test of the LLRF in C band high-gradient test facility for SXFEL [J]. Nuclear Science and Techniques, 2020, 31(10): 100-100.
[2]	Kui Liu, Lin Li, Cheng Wang, Qiang Gu, Ming-Hua Zhao. Multi-port cavity model and Low-level RF Systems design for VHF gun [J]. Nuclear Science and Techniques, 2020, 31(1): 8-8.
[3]	Hui YUAN, Yubin ZHAO, Xiang ZHENG, Pengpeng GONG, Xuefang HUANG, Yangyang XIA, Shenjie ZHAO, Zhigang ZHANG, Kai XU, Qiang CHANG, Jianfei LIU. Design and implementation of high performance frequency synthesizer for SSRF [J]. Nuclear Science and Techniques, 2019, 42(4): 40105-040105.
[4]	Lubei LIU, Chunlong LI, Peiyan YU, Fengfeng WANG, Chenzhang YUAN, Yuan HE, Shenghu ZHANG, Bin ZHANG. Development of RF superconducting cavity forward power coupler [J]. Nuclear Science and Techniques, 2019, 42(2): 20201-020201.
[5]	Pengpeng GONG, Yubin ZHAO, Hongtao HOU, Zhigang ZHANG, Xiang ZHENG, Kai XU, Qiang CHANG, Yangyang XIA, Jianfei LIU. Front-end frequency conversion module design for harmonic RF system in SSRF [J]. Nuclear Science and Techniques, 2019, 42(1): 10101-010101.
[6]	Long Chen, Shen-Hu Zhang, Yong-Ming Li, Ruo-Xu Wang, Tiancai Jiang, Lei Yang, Chun-Long Li, An-Dong Wu, Shi-Chun Huang, Feng Pan, Xin-Meng Liu, Yuan He. Room-temperature test system for 162.5 MHz high power couplers [J]. Nuclear Science and Techniques, 2019, 30(1): 7-7.
[7]	Zhe-Qiao Geng. Beam-based optimization of SwissFEL low-level RF system [J]. Nuclear Science and Techniques, 2018, 29(9): 128-128.
[8]	LI Mingda, ZHAO Yubin, ZHENG Xiang, XIA Yangyang, ZHANG Zhigang, ZHAO Zhentang. Design and implementation of frequency tracking and amplitude-phase feedback in RFQ low level control system [J]. Nuclear Techniques, 2018, 41(6): 60202-060202.
[9]	Jin Yang, Ying-Chao Du, Li-Xin Yan, Gang Huang, Qiang Du, Yi-Lun Xu, Wen-Hui Huang, Huai-Bi Chen. Laser–RF synchronization based on digital phase detector [J]. Nuclear Science and Techniques, 2017, 28(4): 57-57.
[10]	Jin Yang, Gang Huang, Qiang Du, Lawrence Doolittle, John Byrd. ADC evaluation boards design and test framework for LCLS-II precision receiver [J]. Nuclear Science and Techniques, 2016, 27(5): 118-118.
[11]	ZHANG Junqiang, LIU Yajuan, ZHONG Shaopeng, LI Lin, LI Yingmin, GU Qiang. Low level radio frequency system of 15-MeV electrons linac [J]. Nuclear Techniques, 2016, 39(3): 30403-030403.
[12]	ZHANG Zhi-Gang, ZHAO Yu-Bin, XU Kai, ZHENG Xiang, LI Zheng, ZHAO Shen-Jie, CHANG Qiang, HOU Hong-Tao, MA Zhen-Yu, LUO Chen, MAO Dong-Qing, SHI Jing, WANG Yan, LIU Jian-Fei . Digital LLRF controller for SSRF booster RF system upgrade [J]. Nuclear Science and Techniques, 2015, 26(3): 30106-030106.
[13]	YI Xing, LENG Yongbin, LAI Longwei, ZHANG Ning, YANG Guisen. RF front-end for digital beam position monitor signal processor [J]. Nuclear Science and Techniques, 2011, 22(2): 69-65-69.

Nuclear Science and Techniques

Multi-frequency point supported LLRF front-end for CiADS wide-bandwidth application

Abstract

References

Related Articles 13

Metrics

Comments

10