The beamline is equipped with two APPLE II helical insertion devices. They have periods of 44 mm and 80 mm and allow us to cover the whole energy range of the beamline using the first harmonic.

The picture shows the two insertion devices installed in the straight section of Soleil. The HU80 is quasi-periodic to reduce as much as possible the higher harmonic contamination of the photon beam.

The magnetic arrangement can be seen in the small picture in the bottom.