Brillouin Scattering With Simultaneous X-Ray Diffraction at GSECARS, Advanced Photon Source: Toward Determination of Absolute Pressure Scales. Jay Bass 1 Stanislav Sinogeikin 1,2 Dmitry Lakshtanov 1 Carmen Sanchez-Valle 1 Vitali Prakapenka 2, Guoyin Shen 2,3 Jean-Philippe Perrillat 1
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Brillouin Scattering With Simultaneous X-Ray Diffraction at GSECARS, Advanced Photon Source: Toward Determination of Absolute Pressure Scales
1 University of Illinois at UC, Geology Dept.
2 GSECARS, The University of Chicago
3 HPCAT, Advanced Photon Sourse, Argonne National Laboratory
4 Carnegie Institution of Washington, Geophysical Laboratory
Fall AGU 2006
Brillouin Scattering with synchrotron X-rays at the APS
Elasticity Grand Challenge
COMPRES Infrastructure Development Project
Measure sound velocities and density simultaneously
“Absolute” or internally consistent Pressure Scales
Zha et al., Brillouin on MgO (PNAS, 2000)
Isothermal bulk modulus
Adiabatic elastic moduli
Phase Transitions: Stishovite - CaCl2
Stishovite - CaCl2 : Brillouin scattering velocities
Platelet (symmetric) geometry
Vi = / 2sin (*/2)
Vi = / 2n*sin (/2)
Schematic diagram of the Brillouin system installed at sector 13-BMD (GSECARS) at APS
Sinogeikin et al.,Rev.
Sci. Instr. 77, 2006
Schematic diagram of the Brillouin system installed at sector 13-BMD at APS (Lower Tier)
Motorized translation components (controllable from outside the hatch, blue boxes): HMTS - horizontal motorized translation stage; VMTS - vertical motorized translation stage; MLFA - motorized laser focusing assembly; MSCA - motorized signal collecting assembly; SPOA - sample positioning and orientation assembly; SL-LB - sample light / light block.
Observation / feedback elements (red boxes): VC - video camera; BT - beam target.
X-ray components: MAR - MAR Imaging plate; XBS - X-ray beam stop; CS - cleanup slit.
Schematic view of simultaneous Brillouin scattering and X-ray diffraction in DAC
X-ray image and spectrum of single-crystal NaCl in Ne at 30 GPa
Single crystal and aggregate elastic moduli of NaCl (B1) as a function of density
Aggregate velocities of NaCl (B1) as a function of density
Isothermal bulk modulus (volume measurements)
Adiabatic elastic moduli (velocity measurements)
We measure Ks as a function of volume directly. The problem is to convert KS to KT at high pressure, e.g. we need to know volume dependence of a and g.