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

Qi Chen; Zheng Gao; Zheng-Long Zhu; Zong-Heng Xue; Yuan He; Xian-Wu Wang

doi:10.1007/s41365-020-0733-9

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

ACCELERATOR, RAY AND APPLICATIONS | Updated：2021-01-26

- Multi-frequency point supported LLRF front-end for CiADS wide-bandwidth application
- Multi-frequency point supported LLRF front-end for CiADS wide-bandwidth application
- 核技术（英文版） 2020年31卷第3期文章编号：29
- Affiliations：
  
  1.Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
  2.School of Nuclear Sciences and Technology, University of Chinese Academy of Sciences, Beijing 100049, China
- Author bio：
  
  Corresponding author, hey@impcas.ac.cn
- Funds：
- DOI：10.1007/s41365-020-0733-9
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Qi Chen, Zheng Gao, Zheng-Long Zhu, 等. Multi-frequency point supported LLRF front-end for CiADS wide-bandwidth application[J]. 核技术（英文版）, 2020,31(3):29

Qi Chen, Zheng Gao, Zheng-Long Zhu, et al. Multi-frequency point supported LLRF front-end for CiADS wide-bandwidth application[J]. Nuclear Science and Techniques, 2020,31(3):29
Qi Chen, Zheng Gao, Zheng-Long Zhu, 等. Multi-frequency point supported LLRF front-end for CiADS wide-bandwidth application[J]. 核技术（英文版）, 2020,31(3):29 DOI： 10.1007/s41365-020-0733-9.

Qi Chen, Zheng Gao, Zheng-Long Zhu, et al. Multi-frequency point supported LLRF front-end for CiADS wide-bandwidth application[J]. Nuclear Science and Techniques, 2020,31(3):29 DOI： 10.1007/s41365-020-0733-9.

摘要

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 ,R,2, 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 crosstalk between adjacent channels. The phase noise spectrum is lower than 80 dBc in the range of 0-1 MHz, and cumulative phase noise is 0.006°; amplitude and phase stability are 0.022

关键词

Keywords

Frequency jumpRF Front-endLLRFCiADS

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