Optical design for a bending-magnet beamline based on a varied-line-spacing plane grating

Area of Science:

• Physics
• Optics
• Spectroscopy

Background:

• Grazing-incidence constant-deviation-angle monochromators are popular for their high resolution and throughput.
• Previous work by Yan & Yagishita (1995) improved energy resolution using an undulator light source by eliminating defocus aberration.

Purpose of the Study:

• To design a vacuum ultraviolet beamline utilizing a grazing-incidence constant-deviation-angle monochromator for a bending-magnet light source.
• To evaluate the performance of this monochromator, specifically its energy resolution, photon flux, and spot size, when adapted for a bending-magnet beamline.

Main Methods:

• Design of a grazing-incidence constant-deviation-angle monochromator with a varied-line-spacing plane grating.
• Application of a method to eliminate defocus aberration at specific energies.
• Performance evaluation using a bending-magnet light source with wide emittance.

Main Results:

• The designed monochromator achieves high performance, including high energy resolution, even with a bending-magnet light source.
• The method for eliminating defocus aberration is effective for bending-magnet beamlines.
• Detailed performance data on energy resolution, photon flux, and spot size are reported.

Conclusions:

• The proposed vacuum ultraviolet beamline design is effective for bending-magnet light sources.
• This design offers a viable solution for achieving high-resolution spectroscopy in the vacuum ultraviolet range.
• The monochromator's performance characteristics make it suitable for a wide spectral range and various experimental needs.