Experimental Station 2-3

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 Kirkpatrick-Baez mirrors system is used to achieve microfocus with a beam size of ~ 2 x 2 microns. 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 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). 

Supported Techniques
X-ray absorption spectroscopy imaging
Main Scientific Disciplines
Environmental Sciences
Materials Sciences
Beam Line Specifications


1.3 Tesla Bend Magnet, 0.75 mrad acceptance

  Energy Range Resolution ΔE/E Spot Size Flux
Unfocused 4900-23000 eV ~5 x 10-4 1 and 5 micron ~1 x 1010



Cynlindrical Kirkpatrick-Baez optics, Si(111)

Monochromator Crystal Glitch Library

Crystal changes need to be scheduled and coordinated in advance with BL support staff.


584 microns Be, 10.7 meters He, 15.2 microns C


Detectors: ionization chambers, Vortex Silicon Drift Detector, CCD detector for µXRD

Sample Positioning: Newport Micro sample positioner, SmarAct Piezo positioner for tomographysample positioner 

Sample Environment

Ambient temperature and pressure, cryostage available upon request

Sample size: flexible, ~24 X 24 mm in one image, also accommodates larger samples

Data Acquisition and Analysis
Beam Line Phone
650-926-5223. On-site Users: Contact the Duty Operator at 9-926-4040
Beam Line Contact

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