A grazing incidence spectrograph for recording spectra in the range of 5–50 nm

A wide-range grazing-incidence spectrograph based on a spherical grating has been developed for recording integrated (over time) line spectra in the region of 5–50 nm. Resolution of the spectrograph λ/Δλ has been determined; at a wavelength of 5 nm, it exceeds 500 units. The spectrograph has been used to analyze line spectra of multiply charged ions for strong resonance lines in the range of 15–20 nm and record the line of X-ray lasing on the 3p-3s transition of a Ne-like Ar ion with wavelength λ = 46.9 nm.