Design of a low level control system for the RFQ accelerator of PKUNIFTY

YU Tianjun; LU Yuanrong

doi:10.11889/j.0253-3219.2015.hjs.38.080204

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Design of a low level control system for the RFQ accelerator of PKUNIFTY

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- Design of a low level control system for the RFQ accelerator of PKUNIFTY
- NUCLEAR TECHNIQUES Vol. 38, Issue 8, Article number: 080204(2015)
- 作者机构：
  
  北京大学重离子物理研究所,北京,100871
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.080204
  CLC：
- Published：13 August 2015
- 稿件说明：
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YU Tianjun, LU Yuanrong. Design of a low level control system for the RFQ accelerator of PKUNIFTY[J]. Nuclear techniques, 2015, 38(8): 080204
DOI：

YU Tianjun, LU Yuanrong. Design of a low level control system for the RFQ accelerator of PKUNIFTY[J]. Nuclear techniques, 2015, 38(8): 080204 DOI： 10.11889/j.0253-3219.2015.hjs.38.080204.

摘要

北京大学自主研制了基于射频四极(Radio Frequency Quadrupole

RFQ)强流氘束加速器。为满足该加速器稳定运行的要求，设计了一套低电平控制系统，系统主要包含自动增益控制(Automatic Gain Control

AGC)和自动频率控制(Automatic Frequency Control

AFC)两种方式，可实现对腔体频率、进腔功率的自动控制和手动控制。为保证安全、稳定运行，对SWR (Standing Wave Ratio)、限位信号进行监测，通过RS232协议和LabVIEW界面实现HMI (Human Machine Interface)，亦可实现与PLC (Programmable Logic Controller)的无缝对接。连续闭环运行表明，控制系统对场幅度和相位的控制精度能够达到±1%和±1°之内，证明该低电平控制系统达到了RFQ加速器对各路功率和腔体频率稳定控制的要求。

Abstract

Background: The Peking University Neutron Imaging Facility (PKUNIFTY) was developed by using neutron sources generated by Radio Frequency Quadrupole (RFQ) accelerators. Purpose: This study aims to design a low level control system that meet the requirement of stable operation of the RFQ accelerator. Methods: Both the automatic gain control (AGC) and automatic frequency control (AFC) were designed to control the cavity frequency. The power fed into cavity by automatic and manual ways. In order to make it safe and stable

the standing wave ratio (SWR) and limit signal were constantly monitored. The human machine interface (HMI) was implemented in the remote computer using LabVIEW

it communicates with both the control system’ microcontroller unit (MCU) and the Programmable Logic Controller (PLC) via RS232 interface. Results: The control precision of the accelerating field is ±1% in amplitude and ±1° in phase in a 48-h closed loop test. Conclusion: Test results show that the low level control system meet the requirements for stable control of the power and cavity frequency of RFQ accelerator. Abstract

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