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- Toroidal/cylindrical mirror with bender
Toroidal/cylindrical mirror with bender
Variable radius X-ray mirror
The mirror is integrated inside a mechanical bender for continuous adjustment of the radius of curvature in the meridional direction between 20 km convex and 11 km concave. The mirror is composed of 3 regions:
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a central region with a cylindrical shape in the sagittal direction (acts as a toroidal mirror, if bent to the appropriate radius) ;
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2 outer flat regions. For R =
The variable radius in the meridional plane allows the optional utilisation of additional collimating and focusing elements in the same plane. At present, there is a collimating refractive compound lens (CRL), made out of Beryllium, installed at 28.5 m from the source point in OH1. The purpose of this lens is to better match the spectral angular acceptance of the high-heatload silicon (1 1 1) and the postmonochromator, as well as to keep the vertical size of the X-ray beam as small as possible so that a focusing CRL can be effectively used (demagnifiaction M 1:11 with p=94 m and q=8 m).
Mirror name: MRX 64 M2 (engraved on mirror side) Mirror dimensions (LxWxT) : 1200x118x80 mm 3 Material : Silicon Coating : Pt (600Å) Shape U-BENDER Supplier : SESO Characteristics: Optical surface: 800x20 mm2 Surface roughness : < 3 Å rms over 1.3 mm x 100m Meridional Slope error: on 800mm < 1.2 rad rms (see below) Meridional Radius: -20 km up to 11 km Sagittal radius: 101.9mm ± 0.2mm Reflectivity: 83 – 76% Focal size: 280 x 60 m (hor. x vert.; FWHM)