A. Herring, OSU, uses tomography at 13 BMD to quantify pore scale trapping and to analyze how mechanisms affect the efficiency of capillary trapping of CO2 in saline aquifers.

Tomography at 13 BMD

A Best-Yet Cell Culture System for Age-Related Macular Degeneration

An international team utilizing 13-ID-E has developed a cell culture model that could help to develop earlier treatment strategies for age-related macular degeneration (AMD). Details in ANL Science Highlights based on press release from the University of Alabama at Birmingham.

A Best-Yet Cell Culture System for Age-Related Macular Degeneration

X-ray diffraction patterns from a diamond anvil cell (DAC).

X-ray diffraction is the most powerful technique for crystal structure determination. From left to right, patterns from a single crystal, polychrystalline, nano-cyrstalline and amorphous crystals.

X-ray diffraction patterns from a diamond anvil cell.

High pressure x-ray tomographic microscopy module

The HPXTM module helps researchers study the texture change of their sample under extreme pressure and temperature conditions by collecting in-situ HP/HT 3D x-ray tomographic images.

High Pressure X-ray Tomographic Microscopy Module sitting outside of the 250 ton press in 13 BMD.

GSECARS hosts experiments at 13 IDE for high school students in the Exemplary Student Research Program (ESRP) representing local area high schools. GSECARS Outreach

GSECARS Outreach

GSECARS is a national user facility
for frontier research in the earth sciences using synchrotron radiation at the
Advanced Photon Source, Argonne National Laboratory.

GSECARS provides earth scientists with access to the high-brilliance hard x-rays from this third-generation synchrotron light source. All principal synchrotron-based analytical techniques in demand by earth scientists are being brought to bear on earth science problems:

  • High-pressure/high-temperature crystallography and spectroscopy using the diamond anvil cell
  • High-pressure/high-temperature crystallography and imaging using the large-volume press
  • Powder, single crystal and interface diffraction
  • Inelastic x-ray scattering
  • X-ray absorption fine structure spectroscopy
  • X-ray fluorescence microprobe analysis
  • Microtomograph

Science Highlights

High pressure synchrotron radial XRD experiment at GSECARS 13 IDD explains the origin of the shear wave anisotropy in the D” layer.

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XRD pattern of pPv25 at 150GPa and 2500K. Variations in peak position of pPv are observed to be small, indicating that elastic stresses in the sample chamber are low. Systematic intensity variations of the peak demonstrate the
texture distributions.

                                                       Abstract

Crystallographic preferred orientation (CPO) of post-perovskite (Mg,Fe)SiO3 (pPv) has been believed to be one potential source of the seismic anisotropic layer at the bottom of the lower mantle (D00 layer). However, the natural CPO of pPv remains ambiguous in the D00 layer. Here we have carried out the deformation experiments of pPv-(Mg0.75,Fe0.25)SiO3 using synchrotron radial X-ray diffraction in a membrane-driven laser-heated diamond anvil cell from 135 GPa and 2,500 K to 154 GPa and 3,000 K. Our results show that the intrinsic texture of pPv-(Mg0.75,Fe0.25)SiO3 should be (001) at realistic P–T conditions of the D00 layer, which can produce a shear wave splitting anisotropy of B3.7% with VSH4VSV. Considering the combined effect of both pPv and ferropericlase, we suggest that 50% or less of deformation is sufficient to explain the origin of the shear wave anisotropy observed seismically in the D00 layer beneath the circum-Pacific rim.

Wu, X., Lin, J.F., Kaercher, P., Mao, Z., Liu, J., Wenk, H.R. and Prakapenka, V.B., 2017. Seismic anisotropy of the D 00 layer induced by (001) deformation of post-perovskite. NATURE, 8(14669), p.1.


► Science Careers in Search of Women

The conference provided participants with the unique opportunity to explore their desired profession or area of interest through interaction with Argonne’s world-class women scientists and engineers.
Web Site

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Irina Kosheleva (BioCARS) gave a tour of the Sector 14 facilities to the young women participating in the Science Careers in Search of Women event.

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Joanne Stubbs and Margaret Koker (GSECARS) talked to the participants about science careers in the geological sciences and computer programming.