The source of the SIM beamline is a pair of APPLE X UE36knot undulators, which produce up to 1015 photons/second in a photon energy range of 260 - 1600 eV covering most relevant core levels from the C K-edge (280eV) up to the rare earth M-edges (~1600 eV) on the fundamental harmonic.
| Type | Elliptical twin undulator UE36knot X-type |
|---|---|
| Period length | 36 mm |
| Number of periods | |
| Gap | 11.5 - 30.5 mm |
| Polarization | Linear: 0o (horizontal), ±45o and 90o (vertical) Circular: right / left |
| K value | |
| Operating on harmonics | 1 |
| Maximum field | |
| Energy range | 260 - 1600 eV |
Figure 1: APPLE X UE36knot undulator during construction in May 2024.