Research of Digital  Low Level  Radio Frequency Control System   for  HIRFL

CONG  Yan; XU-Zhe; LI  Gang; WANG  Xian-wu; SUN  Lie-peng; YI  Xiao-ping

doi:10.11804/NuclPhysRev.29.03.248

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Article Navigation > Nuclear Physics Review > 2012 > 29(3): 248-252

CONG Yan, XU-Zhe, LI Gang, WANG Xian-wu, SUN Lie-peng, YI Xiao-ping. Research of Digital Low Level Radio Frequency Control System for HIRFL[J]. Nuclear Physics Review, 2012, 29(3): 248-252. doi: 10.11804/NuclPhysRev.29.03.248

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CONG Yan, XU-Zhe, LI Gang, WANG Xian-wu, SUN Lie-peng, YI Xiao-ping. Research of Digital Low Level Radio Frequency Control System for HIRFL[J]. Nuclear Physics Review, 2012, 29(3): 248-252. doi: 10.11804/NuclPhysRev.29.03.248

Research of Digital Low Level Radio Frequency Control System for HIRFL

doi: 10.11804/NuclPhysRev.29.03.248

1.
Lanzhou Institute of Modern Physics, Chinese Acadey of Sciences, Lanzhou 730000, China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China;

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2012-09-20

Abstract

In order to ensure that the beam quality is well enough， we need to precisely control the frequency， amplitude and phase of cavity electric field. Traditional control system consists of amplitude loop and phase loop. And these two loops control amplitude and phase stability respectively. The digital low level radio frequency (LLRF) system， which uses advanced digital control technology， needs only one feedback loop to control amplitude and phase stability. The phase control precision and stability of the system are higher than the traditional control system. The LLRF system is based on field programmable gate array (FPGA) and digital signal processing (DSP)， and implemented by direct digital frequency synthesis (DDS) and digital orthogonal modulation and demodulation (I/Q) technology. The digital LLRF system has been tested in a longterm stability and highpower experiments. The amplitude deviation is lower than ±1%， and phase control accuracy is within ±1°.
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Research of Digital Low Level Radio Frequency Control System for HIRFL

doi: 10.11804/NuclPhysRev.29.03.248

1. Lanzhou Institute of Modern Physics, Chinese Acadey of Sciences, Lanzhou 730000, China;2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China;

Received Date: 1900-01-01
Rev Recd Date: 1900-01-01
Publish Date: 2012-09-20

Key words:

digital orthogonal modulation and demodulation /
direct digital frequency synthesizer /
proportional integration control /
digital signal processing /
field programmable gate array

Abstract: In order to ensure that the beam quality is well enough， we need to precisely control the frequency， amplitude and phase of cavity electric field. Traditional control system consists of amplitude loop and phase loop. And these two loops control amplitude and phase stability respectively. The digital low level radio frequency (LLRF) system， which uses advanced digital control technology， needs only one feedback loop to control amplitude and phase stability. The phase control precision and stability of the system are higher than the traditional control system. The LLRF system is based on field programmable gate array (FPGA) and digital signal processing (DSP)， and implemented by direct digital frequency synthesis (DDS) and digital orthogonal modulation and demodulation (I/Q) technology. The digital LLRF system has been tested in a longterm stability and highpower experiments. The amplitude deviation is lower than ±1%， and phase control accuracy is within ±1°.


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