Undulator Systems

The Undulator Systems Group is responsible to maintain and operate the undulators as well as important elements of the intersections as quadrupole movers, correction coils and phase shifters of the European XFEL undulator lines. European XFEL has three undulator lines: two for hard and one for soft X-rays. The two hard X-ray lines SASE1 and SASE2 consist of 35 undulators cells, while SASE3, the soft X-ray line of 22. All these undulators are planar permanent magnet ones. In order to obtain different polarization modes, as required by the soft X-ray beamlines, a helical afterburner consisting of four APPLE X undulators (designed by PSI) is installed at the downstream end of the present SASE3 undulator line.

Superconducting Undulators

The group is also leading R&D of superconducting undulators (SCUs), which is of strategic importance for European XFEL facility upgrade. The group is responsible of the following relevant infrastructure:

  • a winding machine and impregnation chamber to build SCU mock-up coils in house,

  • development of two test stands (vertical bath SUNDAE1 and horizontal SUNDAE2) in collaboration with DESY to perform training and magnetic field measurements of SCU coils.

The development program is advised by the Superconducting Undulators Technical Advisory Committee (SCU-TAC).


The Superconducting Undulators Technical Advisory Committee (SCU-TAC) consults the Undulator Systems Group and reports to the Management of the European XFEL in matters of fundamental importance for the development and potential upgrades of the superconducting undulators.