BL2-3

Overview
SPEAR3

1.3 Tesla Bend Magnet, 0.75 mrad Acceptance

Beam line 2-3 is a bending magnet side station dedicated to x-ray imaging and micro x-ray absorption spectroscopy (edge, EXAFS) as well as micro diffraction of biological, material, and geological samples. A set of SIGRAY axially symmetric mirror systems are used to achieve a microfocus with an option of a beam size of ~ 3 x 3 microns, or sub-micron spots. The energy range of the beam line optics covers 4.9-23 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 sub-micron accuracy by two different sample stages depending on the experiment. A multisample holder is typically installed to rotate up to 6 different samples into the beam. 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).

Sample Environment —

Ambient temperature and pressure LN2 Cryo-sample holder is in commissioning
Sample size flexible, ~24 X 24 mm in one image, also can accommodate larger samples

Instrumentation —

Detectors Ionization chambers, Vortex Silicon Drift Detector with Xpress3
Sample Positioning Newport Micro sample positioner with 6 position sample holder, SmarAct Piezo positioner for tomography.

Technical Specifications

Energy —

Energy Range Resolution ΔE/E Spot Size Flux
Focused 4900-23000 eV ~5 x 10-4 < 1 x 1 microns ~1.5 x 109

Optics —

Monochromator, SIGRAY Axially Symmetric Mirrors
Water cooled, double crystal, Si(111), Si(220), Si(400)
Monochromator Crystal Glitch Library

Absorption —

584 microns Be, 10.7 meters He, 15.2 microns C

Publications

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Science Highlights

Beam Line 2-3 Science Highlights

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