Permanent Helical Undulators with Strong Fields

E. Bamberg, E. Magory, N. Balal, V. L. Bratman

Research output: Contribution to journalConference articlepeer-review


Undulators containing magnetized rare-earth helices can provide a significantly higher oscillatory electron velocity than the widely used planar Halbach undulators. Using Wire Electrical Discharge Machining (WEDM), it is possible to manufacture NdFeB helices with a period of 1 mm or less with high accuracy. In this work, we describe the results of manufacturing and studying prototypes of undulators in the form of one or two axially and radially magnetized helices. More efficient hybrid systems of two axially oppositely magnetized and two steel non-premagnetized helices with a field on the axis of the order of 1 T are also shown. Micro-undulators of this type can significantly increase the efficiency of XFELs and Inverse FELs.

Original languageEnglish
Article number032045
JournalJournal of Physics: Conference Series
Issue number3
StatePublished - 2024
Event14th International Particle Accelerator Conference, IPAC 2023 - Venice, Italy
Duration: 7 May 202312 May 2023


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