The F3 station is a versatile bend-magnet station that can accommodate a variety of experimental capabilities. It has a double-crystal Si (111) as a standard monochromator with a sagittal focusing second crystal which focuses about 3 mrad of bending magnet radiation, tunable from 6 to 18 keV. A vertically focusing mirror will be installed downstream of the monochromator in the near future to provide a doubly-focused beam at the station. Alternatively, unfocused multilayers can be used as the monochromator, providing wide-bandpass radiation at 0.22% and 0.6%, with a tunable energy range of 5-18 keV.
Two standard experimental setups are available at F3. The first is a scanning x-ray microscope with resolution approaching 10 micrometers. This setup also is suitable for x-ray imaging, fluorescence imaging, and EXAFS. An energy- dispersive x-ray fluorescence detector monitors fluorescence signals from the specimen, and can generally detect trace elements down to the parts-per- million level. Flat samples up to 28 cm x 28 cm can be accomodated. The scanning x-ray fluorescence microscope is a versatile tool, used for archeology, anthropology, geology, environmental science and materials science.
The second setup at F3 is a standard MacCHESS oscllation camera with a single horizontal rotation axis, controlled through standard MacCHESS oscillation software. Experiments using this setup include studies of disorders in protein crystals, radiation damage control in protein crystallography, and SAD phasing with intrinsic sulfur anomalous signals at <6 keV. 0.22 % energy bandwidth multilayers are used to provide increased flux over the standard Silicon (111) monochromator, providing intense x-ray beams with incident energies of 6-10 keV, sufficient for SAD phasing of metalloproteins bearing iron and manganese, for example.
| F3 Station Summary | |
| Source: | e+s, Hard bend magnet HB7E, 6 mrad (horizontal) into F3 |
| Source size: | FWHM (horizontal) = 3.63 mm, FWHM (vertical) = 0.86 mm |
| Distance to source: | 21.6 m to center of hutch |
| Be Windows: | 0.040 inch to F3 hutch |
| Cave slit sizes: | 0 to 50 mm (horizontal), 0 to 5 mm (vertical) |
| Monochromators: | Double-bounce downward, offset 25 -110 mm |
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| Crystals | Sag. Focus. | Energy (keV) |
| Si (111) | Yes | 6 - 20 |
| 0.6% | No | 6 - 18 |
| 0.22% Multilayers | No | 6 - 11 |
| Monochromatic Mirrors | |||
| Type | Length | Vertical Focus | E*θ°(keV-mrad) |
| Rh coated Si (available soon) |
600 mm | Yes | 67.0 |
| Typical Experiments | |
| Type | Equipment Setup |
| EXAFS | Optical Table |
| Near-edge diffraction | Optical Table |
| Oscillation Crystallography | Optical Table |
| Scanning X-ray Fluorescence Spectroscopy | Optical Table |
2009 Run
Sept. 23rd to Nov. 10th
