上海光源谐波腔系统的前端变频模块方案设计

doi:10.11889/j.0253-3219.2019.hjs.42.010101

Nuclear Science and Techniques ›› 2019, Vol. 42 ›› Issue (1): 10101-010101.doi: 10.11889/j.0253-3219.2019.hjs.42.010101

Front-end frequency conversion module design for harmonic RF system in SSRF

Pengpeng GONG^1,^2,³,Yubin ZHAO^1,³,Hongtao HOU^1,³,Zhigang ZHANG^1,³,Xiang ZHENG^1,³,Kai XU^1,³,Qiang CHANG^1,³,Yangyang XIA^1,^2,³,Jianfei LIU^1,³()

1. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
2. University of Chinese Academy of Sciences, Beijing 100049, China
3. Shanghai Key Laboratory of Cryogenics & Superconducting RF Technology, Shanghai 201800, China

Received:2018-08-24 Revised:2018-09-18 Online:2019-01-10 Published:2019-01-25
Contact: Jianfei LIU E-mail:liujianfei@sinap.ac.cn
Supported by:
Supported by National Natural Science Foundation of China (No.11335014)

Abstract

Abstract: Background

Shanghai synchrotron radiation facility (SSRF) is the third generation synchrotron radiation source. In the phase II project, the third harmonic superconducting cavity will be used to improve Touschek lifetime by lengthening the bunch.

Purpose

This study aims to achieve the tuning control of the harmonic radio frequency (RF) system by frequency reduction of the 1.5 GHz signal from harmonic cavity for signal sampling in the control system.

Methods

First of all, three kinds of frequency conversion schemes were introduced. Then outcomes of reducing 1.5 GHz RF signal to 31.25 MHz intermediate frequency (IF) signal by using these three schemes were performed. Finally the characteristics of each scheme and the factors affecting the results of down conversion are analyzed.

Results

The test results shown that three down conversion schemes has good linearity in different dynamic range and met control system specifications. The optimal scheme based on frequency multiplier achieved best performance of linear dynamic range greater than 70 dB and lowest phase noise of IF signal.

Conclusion

A down conversion scheme with frequency multiplier will be applied in the harmonic RF control system.

Key words: Third harmonic cavity, Down conversion, Low level radio frequency (LLRF), Touschek lifetime

CLC Number:

TL503.2

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.

Figures/Tables 7

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Front-end frequency conversion module design for harmonic RF system in SSRF

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