Nuclear Techniques ›› 2019, Vol. 42 ›› Issue (10): 100203-100203.doi: 10.11889/j.0253-3219.2019.hjs.42.100203


Design and measurement of CTFEL magnets

Longgang YAN1,Yuzhu CUI1,Hao ZHANG1,Derong DENG1(),Qing LI2,3,Yingshun ZHU2,Xingfan YANG1,Ming LI1   

  1. 1. Institute of Applied Electronic, China Academy of Engineering Physics, Mianyang 621900, China
    2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
    3. Dongguan Neutron Science Center, Dongguan 523803, China
  • Received:2018-09-04 Revised:2019-04-28 Online:2019-10-13 Published:2019-10-16
  • Contact: Derong DENG
  • About author:YAN Longgang, male, born in 1986, graduated from Lanzhou University with a master's degree in 2010, focusing on free electron laser theory and technology
  • Supported by:
    National Major Scientific Instruments and Equipment Development Project(2011YQ130018);National Natural Science Foundation Project of China(11505174)

Abstract: Background

China Academy of Engineering Physics THz Free electron laser (CAEP THz FEL), referred to as CTFEL, is the first scientific facility in China that can provide users with high power and wide-spectrum terahertz waves. As an accelerator-based radiation source, magnet is one of the most important components for the transportation, measurement and manipulation of electron bunch.


This study aims at the design and measurement of magnets to satisfy that requirements of CTFEL.


According to the specifications of CTFEL magnets, the magnet system was designed to consist three solenoids, three 45° dipoles, one 90° dipole, six circular quadrupoles and six square quadrupoles. The problems of design and their solution schemes were described. The magnetic field distribution, integral field distribution, transverse field distribution and magnetic axis were measured.

Results & Conclusion

The test results show that all magnets satisfied the specification requirements. At present, all magnets have been completely installed and commissioned to ensure the laser operation of the CTFEL facility.

Key words: CTFEL, Magnet, Structure design, Magnetic field measurement

CLC Number: 

  • TL503.8