Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (8): 80204-080204.doi: 10.11889/j.0253-3219.2015.hjs.38.080204

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

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

YU Tianjun LU Yuanrong   

  1. (Institute of Heavy Ion Physics, Peking University, Beijing 100871, China)
  • Received:2014-12-22 Revised:2015-03-09 Online:2015-08-10 Published:2015-08-13

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.

Key words: RFQ accelerator, Low level control system