A time-gated multi-channel x-ray crystal spectrometer on the Shenguang-III laser facility.

An eight-channel x-ray flat crystal spectrometer was developed for high energy density physics research at the Shenguang-III (SG-III) laser facility. The spectrometer uses trihydroxymethylaminomethane crystals (2 d = 8.78 Å) to record Ti K-shell emission in the photon energy range of 4.65-5.05 keV. The spectrometer couples to an x-ray framing camera to achieve time-resolution. This has four microstrips, and each strip records two snapshots of the emission image. Based on the intersection positioning system with a dual-charge coupled device, the alignment system is easily operated and efficient. The instrument was tested and used for Au hohlraum plasma diagnosis experiments on SG-III. The He- α line and its Li-like satellites and the Ly- α line of a Ti tracer were detected, from which the spectral resolution of the instrument was analyzed. The spectral resolution E /Δ E at the Ti He- α line ranges from about 500 to 880 and mainly limited by the x-ray source size.