BioMAX optics layout schematics
BioMAX optics layout schematics
X-ray source (IVU)In-vacuum undulator, 18 mm period,
4.2 mm minimal gap, 2 m magnetic length
Energy (wavelength) range5 - 25 keV (0.5 - 2.5 Å) using 3rd - 11th harmonic of the IVU
Monochromator (HDCM)At 26 m, Si (111), double crystal monochromator,
horizontally deflecting, LN2 side-cooling
Energy bandwidth2 x 10-4 ΔE/E
Focusing opticsKirkpatrick-Baez (KB) mirror pair (VFM, HFM)
Vertical focusing mirror (VFM)At 31.5 m, 3 mrad grazing incidence angle
Flat substrate bent to an elliptical cylinder:
0.148 μrad RMS slope error over 200 mm,
0.18 μrad RMS slope error over 350 mm
Horizontal focusing mirror (HFM)At 32.1 m, 3 mrad grazing incidence angle
Flat substrate bent to a circular cylinder:
0.14 μrad RMS slope error over 250 mm
Harmonic rejectionVFM and HFM with Si/Rh/Pt stripes
Beam size at sample position (37 m)20 x 5 μm2 (FWHM, horizontal x vertical),
larger beam by defocusing or using unfocused beam
Divergence at sample0.1 x 0.1 mrad2 (FWHM)
Flux at sample (focused) at 1 Å2 x 1013 ph/s (through 20 x 5 μm2 pinhole)

 

Contact info: Uwe Mueller