Field measurement facility for the PAL-XFEL undulator

• Published in: Journal of the Korean Physical Society Vol. 66; no. 3; pp. 317 - 322
• Main Authors: Park, K. H., Jung, Y. G., Kim, D. E., Lee, H. G., Suh, H. S., Han, H. S., Lee, S. B., Lee, M. S., Lee, B. H., Sung, C. W., Kim, S. N., Ko, I. S.
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Physical Society 01.02.2015; 한국물리학회
• Subjects: Mathematical and Computational Physics; Particle and Nuclear Physics; Physics; Physics and Astronomy; Theoretical; 물리학; Magnetic field measurement; Magnet
• ISSN: 0374-4884; 1976-8524
• DOI: 10.3938/jkps.66.317

The Pohang Accelerator Laboratory (PAL) is developing a self amplification of spontaneous emission (SASE) based free electron laser (FEL) for X-ray coherent photon sources. The PAL developed a prototype undulator that had a 5.0 m magnetic length and a 7.2 mm minimum gap at a magnetic field of ∼0.908 T. The PAL has constructed an undulator field measurement facility to confirm the field qualities of the X-ray free electron laser (XFEL) undulators in the assembly building. Two field measurement benches which included a Hall probe scanner, a flip coil and a stretched wire system were installed and their performances were evaluated. This paper describes the field measurement facility and presents the performance test results of the two benches.