PAL-XFEL has operated general user program successfully from 2017 in both hard (2.5 – 14 keV) and soft (250 – 1300 eV) X-ray beamlines. Particularly in Soft X-ray Scattering and Spectroscopy (SSS) beamline, X-ray absorption and emission spectroscopy (XAS / XES) endstation has conducted general user programs.
In SSS beamline, second experimental instrument, Resonant Soft X-ray Scattering (RSXS) endstation, was built and open from 2020. This endstation mainly supports optical laser pump (800-nm-wavelength and harmonics) soft X-ray probe (400-1300 eV, covers 3d transition metal L2,3-edge, O K-edge, and part of 5f rare-earth element M4,5-edge) time-resolved RSXS experiments, with a time resolution better than 100 fs. Within less than a year, there have been several successful experiments, mainly in 3d transition metal compounds which are important magnetic and strongly correlated materials. The details of the endstation and selected experimental results will be introduced in the presentation.
Pohang Accelerator Laboratory (PAL) is developing a 0.1 nm SASE based FEL based on 10 GeV S-band linear accelerator named PAL-XFEL. At the first stage, PAL-XFEL needs two undulator lines for photon source. The hard Xray undulator line requires 18 units of 5 m long hybrid-type conventional planar undulator and soft X-ray line requires 6 units of 5 m long hybrid type planar undulator with additional few EPUs for final polarization control. PAL is developing undulator magnetic structure based on EU-XFEL concepts. The key parameters are min pole gap of 8.3 mm, with period length 26 mm (HXU), 35 mm (SXU), and 5.0 m magnetic length. . In this report, the prototyping, and the development of pole tuning procedure, the impact of the background field error, and the effects of the girder bending on the optical phase error will be presented.
The PAL-XFEL, a 0.1-nm hard X-ray FEL facility consisting of a 10-GeV S-band linac, is being constructed in Pohang, South Korea. Its building construction was completed at the end of 2014. The major procurement contracts were complete for the critical components of S-band linac modules and undulators. The installation of linac, undulator, and beam line will be completed by 2015. The commissioning will get started in January 2016 aiming for the first lasing in 2016. We will report the current status, construction progress, and commissioning plans for the PAL XFEL project, including major subsystem preparations.