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Description
We present the design of a high-resolution plane-VLS-grating soft X-ray and VUV monochromator of synchrotron radiation for the 125 – 4200 Å spectral range. A concave mirror is located at a distance of 28 m from a synchrotron radiation source. The mirror is set in a highly asymmetric scheme and focuses radiation at a distance of about 1350 mm. The VLS-grating is set close to the mirror and focuses onto the exit slit the radiation diffracted in the first external order. The frequency is scanned by rotation of only the plane VLS grating. Two replaceable VLS-gratings with line densities of 600 1/mm and 150 1/mm are planned for the 125 – 1000 Å and 900 – 4200 Å spectral ranges, respectively. The ruled area of the VLS gratings is 40x20 mm. The gratings and the mirror each operate for a deviation angle of 32˚, the total deviation angle being equal to zero. The resolving power obtained by numerical ray tracing is higher than 2000 in the entire spectral range. This work was partially supported by RFBR grant No.19-12-50059
