A wide-band, high-resolution vacuum flat crystal spectrometer for LEAF facility

Abstract

A wide-band, high-resolution vacuum flat-crystal spectrometer was developed for analyzing the x-rays spectra of hollow atoms. The spectrometer was designed to cover an energy dynamic range of 0.6 to 16 keV by combining different flat crystals and an x-ray CCD detector mounted on a twistable bellows that could modulate the Bragg angles ranging from 25° to 50°.The performance of the spectrometer was evaluated in energy range of 3–12 keV by measuring the K and L x-rays generated by 10–30 keV electron beam collisions with solid titanium, silver and gold targets, respectively. The typical resolving power of the spectrometer is estimated to be around 103, with a single exposure measurement range of 144–1411 eV and corresponding energy resolution of 3.5–33.2 eV. This spectrometer could be utilized to investigate the fine hyper-satellite line structure of hollow atoms with 10 ≤ Z ≤ 26.