RFQ低电平控制系统频率跟踪与幅相反馈的设计与实现

doi:10.11889/j.0253-3219.2018.hjs.41.060202

Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (6): 60202-060202.doi: 10.11889/j.0253-3219.2018.hjs.41.060202

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles Next Articles

Design and implementation of frequency tracking and amplitude-phase feedback in RFQ low level control system

LI Mingda^1,2, ZHAO Yubin¹, ZHENG Xiang¹, XIA Yangyang^1,2, ZHANG Zhigang¹, ZHAO Zhentang¹

1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2018-03-22 Revised:2018-04-13 Online:2018-06-10 Published:2018-06-06

Abstract

Abstract: [Background] The dynamic tuning of a radio frequency quadrupole (RFQ) is generally achieved via thermal regulation over the vanes and walls. However it takes tens of minutes to reach nominal power.[Purpose] The dynamic tracking of the RFQ's resonant frequency and the amplitude-phase feedback control will make it possible for the RFQ to be powered and form an acceleration field quickly, even though the cooling water of the RFQ does not reach thermal equilibrium.[Methods] An RFQ low-level control system implemented with direct digital synthesis (DDS) and phase-locked loop (PLL) technology was designed and tested at an experimental platform based on a simulation cavity.[Results] The test results show that this scheme can achieve the tracking of resonant frequency with ±0.5% amplitude stability and ±0.5° phase stability.[Conclusion] The performance of system meets expectation, and reaches acquired accuracy.

Key words: RFQ, Low Level Radio Frequency (LLRF), Field Programmable Gate Array (FPGA), DDS

CLC Number:

TL503.6

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.

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Design and implementation of frequency tracking and amplitude-phase feedback in RFQ low level control system

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