Towards an extremely high resolution broad-band flat-field spectrometer in the `water window'

Li, Z.; Li, B.

doi:10.1107/S1600577519004648

Figure 1
Schematic diagram of four kinds of spectrometer design implementing a concave VLS grating with or without pre-mirror (corresponding to A₁–A₄). S represents the light source, L is the distance from the original light source to the grating, d is the distance between the pre-concave (or convex) mirror and the grating, r_c and $[r_{\rm{c}}^{\,\prime}]$ are the object and image distances of the concave (or convex) mirror, respectively, r is the object distance of grating indicated by a dotted arrow, r′ is the image distance of grating. (a) Single concave VLS grating, where the object distance of grating is r = L. (b) The concave VLS grating is combined with a pre-focusing concave mirror, forming a real source for the grating, r = $[{d}-{{r}}_{\rm{c}}^{\,\prime}]$ > 0. (c) A similar case to (b), where the pre-concave mirror forms a virtual source for the grating, r = $[{d}-{{r}}_{\rm{c}}^{\,\prime}]$ < 0. (d) The concave VLS grating is combined with a pre-diverged convex mirror, where the source of the grating is real, i.e. r = $[{d}-{{r}}_{\rm{c}}^{\,\prime}]$ > d > 0, since $[r_{\rm{c}}^{\,\prime}]$ < 0.

JOURNAL OF
SYNCHROTRON
RADIATION

ISSN: 1600-5775

Volume 26| Part 4| July 2019| Pages 1058-1068

https://doi.org/10.1107/S1600577519004648

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