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- Title
Towards an extremely high resolution broad‐band flat‐field spectrometer in the 'water window'.
- Authors
Li, Zhuo; Li, Bin
- Abstract
The optical design of a novel spectrometer is presented, combining a cylindrically convex pre‐mirror with a cylindrically concave varied‐line‐spacing grating (both in the meridional) to deliver a resolving power of 100000–200000 in the 'water window' (2–5 nm). Most remarkably, the extremely high spectral resolution is achieved for an effective meridional source size of 50 µm (r.m.s.); this property could potentially be applied to diagnose SASE‐FEL and well resolve individual single spikes in its radiation spectrum. The overall optical aberrations of the system are well analysed and compensated, providing an excellent flat‐field at the detector domain throughout the whole spectral range. Also, a machine‐learning scheme – SVM – is introduced to explore and reconstruct the optimal system with high efficiency.
- Subjects
SPECTROMETERS; ELECTROMAGNETIC spectrum; RAY tracing; X-ray optics
- Publication
Journal of Synchrotron Radiation, 2019, Vol 26, Issue 4, p1058
- ISSN
0909-0495
- Publication type
Article
- DOI
10.1107/S1600577519004648