Welcome to 12BM

12-BM is a multi-purpose beamline for spectroscopy (XAS), small angle scattering (SAXS) and surface scattering. The beamline is designed to provide a versatile platform to cover a wide range of experimental needs; XAS, SAXS/WAXS and Surface Scattering or even a combination of techniques on the samples under different experimental conditions (heating, cooling, in situ catalytic reaction conditions). In order to achieve an easily adjustable wavelength between 4.5 and 23 keV, the beamline uses a water-cooled, double-crystal, fixed-exit monochromator with Si(111) crystals. A double mirror system (flat plus toroidal) with a cutoff energy of 23 keV focuses the beam in the experimental station to 0.5 mm x 1.2 mm. Unfocused beam can be used for higher energies.

Research Highlights

Bending Magnet Source Characteristics (nominal)

Source APS Bending Magnet
Critical energy 19.51 keV
on-axis peak brilliance at 16.3keV 2.9 x 1015 ph/sec/mrad2/mm2/0.1%bw
on-axis peak angular flux at 16.3keV 9.6 x 1013 ph/sec/mrad2/0.1%bw
on-axis peak horizontal angular flux at 5.6keV 1.6 x 1013 ph/sec/mradh/0.1%bw
Monochromator type Si (111)
Energy Range 4.5keV - 23keV
Resolution (ΔE/E) 1 x 10-4
Flux (photos/sec) 2 x 1011 @ 12keV
Beam Size (focused HxV) 500µm x 1200µm