Abstract
In March 2012, SACLA started user operations of the first compact X-ray free-electron laser (XFEL) facility. SACLA has been routinely providing users with stable XFEL light over a wide photon energy range from 4 to 15 keV and an ultrafast pulse duration below 10 fs. The facility supports experimental activities in broad fields by offering high-quality X-ray optics and diagnostics, as well as reliable multiport charge-coupled-device detectors, with flexible experimental configurations. A two-stage X-ray focusing system was developed that enables the highest intensity of 10(20) W cm(-2). Key scientific results published in 2013 and 2014 in diverse fields are reviewed. The main experimental systems developed for these applications are summarized. A perspective on the facility upgrade is presented.
Highlights
In June 2011, SPring-8 Angstrom Compact free-electronLAser (SACLA) in SPring-8, Harima, Japan (Ishikawa et al, 2012), achieved first lasing at 10 keV
The Japanese government approved the project for constructing the compact X-ray free-electron laser (XFEL) facility, later named SPring-8 Angstrom Compact free-electronLAser (SACLA), as one of the key national technologies in 2006
We developed reflective mirrors (Mimura et al, 2008; Yamauchi, 2015), the DCM (Ohashi et al, 2013) and Be windows (Goto et al, 2007) using the 1 km beamline of SPring-8, and installed them into the Optics Hutch (OH) of the SACLA beamline as key common optics for all experiments
Summary
LAser (SACLA) in SPring-8, Harima, Japan (Ishikawa et al, 2012), achieved first lasing at 10 keV. In parallel to these accelerator studies, we performed R&D on X-ray optics to fully utilize coherent X-rays from an XFEL light source (Yabashi et al, 2014) For this purpose, we exploited two unique X-ray beamlines at SPring-8: a 1 km beamline BL29XU (Ishikawa et al, 2001) and a 25 m undulator beamline 19LXU (Hara et al, 2002). We significantly improved the quality of the mirrors in close collaboration with Osaka University, based on elastic emission machining (EEM) technology (Yamauchi et al, 2002) and precise metrologies, as described by Yamauchi (2015) Following these achievements, the Japanese government approved the project for constructing the compact XFEL facility, later named SACLA, as one of the key national technologies in 2006. We discuss the facility upgrade to expand capabilities and capacities
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