Overview
Beam line 2-3 is a bending magnet side station dedicated to x-ray imaging and micro x-ray absorption spectroscopy (XANES, EXAFS) of biological, material science, and geological samples. A SIGRAY axially symmetric mirror system is used to achieve microfocus with a beam size of either ~ 5 x 5 microns or ~ 1 x 1 microns. The energy range of the beam line optics covers 4.9-20 keV, with detection of fluorescent x-rays as low as Si. BL2-3 is equipped with a Vortex silicon drift detector and ionization chambers. Sample positions are controlled with submicron accuracy by two different sample stages depending on the experiment. BL2-3 is ideal for obtaining elemental maps of small samples (about 10 microns to 25 mm) as well as performing spectroscopy on selected points in the sample (~ 2 x 2 microns).
Status —
Beamline Parameters —
| Energy Range | Resolution ΔE/E | Spot Size | Flux | |
|---|---|---|---|---|
| Unfocused | 4900-23000 eV | ~5 x 10-4 | < 1 x 1 microns | ~2x 1010 |
| Focused | 4900-20000 eV | ~5 x 10-4 | 1 and 5 micron | ~2 x 109 |
Optics —
| Axially Symmetric SIGRAY Mirrors, Si(111) |
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| Crystal changes need to be scheduled and coordinated in advance with BL support staff. |
Source —
Instrumentation —
| Detectors | Detectors: ionization chambers, Vortex Silicon Drift Detector, Visible CCD camera with fluorescence filters Sample Positioning: Newport Micro sample positioner, SmarAct Piezo positioner for tomography sample positioner |
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Sample Environment —
| Ambient temperature and pressure | Cryostage available upon request |
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| Sample size | flexible, ~24 X 24 mm in one image, also accommodates larger samples. Sample cartridges mounted on multi-position sample wheel. |
Absorption —
| 584 microns Be, 10.7 meters He, 15.2 microns C |
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