Advanced Photon Source

An Office of Science National User Facility

12-BM Home Page

Welcome to 12-BM

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 30 keV, the beamline uses a water-cooled, double-crystal, fixed-exit monochromator with Si(111) and Si(311) crystals. A double mirror system (flat plus toroidal) focuses the beam in the experimental station to 0.5 mm x 1.2 mm. Unfocused beam can be used for higher energies.

Link to 12BM User Page.

Research Highlights
Research Highlights
Bending Magnet Source Characteristics (nominal)
Source APS Bending Magnet
Critical energy 19.51 keV
on-axis peak brilliance at 16.3 keV 2.9 × 1015 ph/sec/mrad2/mm2/0.1%bw
on-axis peak angular flux at 16.3 keV 9.6 × 1013 ph/sec/mrad2/0.1%bw
on-axis peak horizontal angular flux at 5.6 keV 1.6 × 1013 ph/sec/mradh/0.1%bw
Monochromator type I Si (111)
Energy Range 4.5 keV - 23 keV
Resolution (ΔE/E) 1 × 10-4
Flux (photos/sec) 2 × 1011 @ 12keV
Monochromator type II Si (311)
Energy Range 10 keV - 30 keV
Resolution (ΔE/E) 5 × 10-5
Flux (photos/sec) 5 × 1010 @ 12keV
Beam Size (focused HxV) 500µm × 1200µm
Beam Size (unfocused HxV) 10mm x 2mm