Abstract
A new stretched-wire system is built for a cryogenic permanent magnet undulator in High Energy Photon Source Testing Facility. The system has two functions: integral field measurement and magnet gap measurement. Integral field measurement and gap measurement are important for evaluation and optimization of the magnetic performance of the undulator in cryogenic–vacuum environment. Two high-precision, high-load motion stages are used for accurate positioning. A special fix structure of stretched wire is adopted for vacuum environment. To reduce the deflection of the 3-meter-long wire, constant tension is maintained along the wire. The measurement repeatability of field integral and magnetic gap is the key performance which depends on the stability of wire and suppression of the electric noise. Strategy of improving the measurement accuracy and stability is presented.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
H.H. Lu, et al., Development of a prfeb cryogenic permanent magnet undulator (CPMU) prototype at IHEP, in Proceeding of the IPAC17, 8th International Particle Accelerator Conference, May 14–19, COPENHAGEN, DENMARKTUPAB064 (2017)
Y. Yang, H. Lu, S. Sun, et al., Field error correction considerations of cryogenic permanent magnet undulator (CPMU) for high energy photon source test facility (HEPS-TF) in 7th International Particle Accelerator Conference (IPAC’16), Busan, Korea, May 8–13. JACOW, Geneva, Switzerland, 2016: 4038–4040 (2016)
Z. Patel, A. George, P. Harris, S.R. Milward, E.C.M. Rial, J.H. Williams, In-Vaccum Cold Measurement Bench Development, International Magnetic Measurement Workshop 21 (ESRF, Grenoble, FR, (2019)
S.C. Sun, et al., Mechanical design of a cryogenic permanent magnet undulator at IHEP, in Proceeding of the IPAC17, 8th International Particle Accelerator Conference, May 14–19, COPENHAGEN, DENMARKTUPAB066 (2017)
L. Zhang, et al., Design of the CPMU vacuum system at the HEPS, in Proceeding of the IPAC17, 8th International Particle Accelerator Conference, May 14–19, COPENHAGEN, DENMARKTUPAB068 (2017)
C. Kitegi, Development of a Cryogenic Permanent Magnet Undulator at the ESRF. Université Joseph Fourier, (2009)
G. LeBec, J. Chavanne, et al., Overview of Magnetic Measurement Activities at the ESRF, IMMW20, DLS, Didcot, UK, (2017)
Y.K. Cheng, J-C. Jan, F-Y. Lin, C-K. Yang, T-Y. Chung, S.H. Ching, A stretched wire system for the measurement of accelerator lattice and insertion device magnets, in International Magnetic Measurement Workshop 21, ESRF, Grenoble, FR, (2019)
P. Arpaia, A. Beaumont, G. Deferne, J. Garcia-Perez, C. Petrone, S. Russenschuck, L. Walckiers, et al. Single-Stretched and Vibrating-Wire Measurements at CERN, IMMW18, Brookhaven, (2013)
W. Lei, W. Xiao-Long, L. Chun-Hua et al., Preliminary R&D of vibrating wire alignment technique for HEPS. Chin. Phys. C 39(8), 087002 (2015)
J. Chavanne, P. Elleaume, Technology of insertion devices. Undulators Wigglers Appl. 1, 148–213 (2003)
J. Chavanne, et al., Magnetic Measurement of a Cryogenic Permanent Magnet Undulator (CPMU), IMMW 16, PSI, (2009)
Acknowledgements
The authors would like to acknowledge colleagues of insertion device project group for great helpful discussion and suggestion.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Li, Z., Chen, W., Lu, H. et al. High-accuracy stretched-wire measurement system for cryogenic permanent magnet undulator (CPMU) in High Energy Photon Source (HEPS). Radiat Detect Technol Methods 4, 492–496 (2020). https://doi.org/10.1007/s41605-020-00204-x
Received:
Revised:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s41605-020-00204-x
Keywords
- Magnetic measurement system
- Cryogenic permanent magnet undulator
- Stretched wire
- Integral field measurement
- Gap measurement