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

Mingda LI; Yubin ZHAO; Xiang ZHENG; Yangyang XIA; Zhigang ZHANG; Zhentang ZHAO

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

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

LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS | 更新时间：2021-05-19

- Design and implementation of frequency tracking and amplitude-phase feedback in RFQ low level control system
- NUCLEAR TECHNIQUES Vol. 41, Issue 6, Article number: 060202(2018)
- 作者机构：
  
  1.中国科学院上海应用物理研究所嘉定园区上海 201800
  2.中国科学院大学北京 100049
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2018.hjs.41.060202
  CLC： TL503.6
- Received：22 March 2018，
  
  Revised：13 April 2018，
  
  Published：10 June 2018
- 稿件说明：
移动端阅览
Mingda LI, Yubin ZHAO, Xiang ZHENG, et al. Design and implementation of frequency tracking and amplitude-phase feedback in RFQ low level control system[J]. Nuclear techniques, 2018, 41(6): 060202
DOI：

Mingda LI, Yubin ZHAO, Xiang ZHENG, et al. Design and implementation of frequency tracking and amplitude-phase feedback in RFQ low level control system[J]. Nuclear techniques, 2018, 41(6): 060202 DOI： 10.11889/j.0253-3219.2018.hjs.41.060202.

摘要

射频四极场（Radio Frequency Quadrupole，RFQ）的动态调谐一般是通过控制腔翼和腔壁上冷却水的水温来实现的。为了方便RFQ老练和调试过程中的功率提升，设计了一个使用直接数字合成技术（Direct Digital Synthesis，DDS）和锁相环（Phase-locked Loop，PLL）技术的RFQ低电平控制系统，该系统可以同时实现对RFQ谐振频率的动态跟踪与幅相反馈控制。即使冷却水没有达到热平衡，RFQ也可以加载功率并形成加速场。该控制系统在以FIR（Finite Impulse Response）滤波器为基础的模拟腔实验平台上进行了测试。测试结果表明：该方案能在对虚拟腔谐振频率进行跟踪的同时，实现±0.5%的幅度稳定度和±0.5°的相位稳定度。

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.

关键词

Keywords

references

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