Magnetic and mechanical design of large-aperture variable-period permanent magnet undulator
Abstract
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.
- Publication:
-
Nuclear Instruments and Methods in Physics Research A
- Pub Date:
- January 2019
- DOI:
- 10.1016/j.nima.2018.10.168
- Bibcode:
- 2019NIMPA.915...36D
- Keywords:
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- Undulator;
- Free electron laser;
- Synchrotron radiation;
- Permanent magnet