Development of an x-ray eight-image Kirkpatrick–Baez diagnostic system for China’s laser fusion facility

This article presents the development of an x-ray eight-image Kirkpatrick–Baez diagnostic system to be used at China’s Shenguang-III (SG-III) laser facility in aspects of the optical design, multilayers, and online/offline tests. Six pieces of concave spherical substrates are used for constituting a special optical structure. Dual-periodic tungsten/carbon (W/C) multilayers are used for high reflectivity and large angular bandwidth of ∼0.1°. The global spatial resolution is ∼5  μm in the ±100  μm range. The schemes of system installation, transport, collimation, and image acquisition at China’s SG-III facility are also discussed.