Magnetic and mechanical design of large-aperture variable-period permanent magnet undulator

I. Davidyuk, O. A. Shevchenko, V. G. Tcheskidov, N. A. Vinokurov

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


The design of the large-aperture variable-period undulator developed for the Novosibirsk free electron laser (FEL) is described. This undulator has a remarkably large (1.4) ratio of the aperture (inner diameter) to the minimum period. High amplitude of on-axis field is achieved due to the arc shape of the magnet blocks and poles of the undulator. Such large-aperture undulators can be used not only for long-wavelength FELs, but also as short-period undulators of modern storage-ring-based high-brightness X-ray sources and X-ray FELs. Results of computer modelling and calculated basic characteristics of the undulator are presented.

Original languageEnglish
Pages (from-to)36-39
Number of pages4
JournalNuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Publication statusPublished - 21 Jan 2019


  • Free electron laser
  • Permanent magnet
  • Synchrotron radiation
  • Undulator


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