Compres Laser Heating Activities Technical CO2 laser heating system at GSECARS Component of ID-D upgrade (in progress) Staff: Andy Campbell (50%, beginning.

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Presentation transcript:

Compres Laser Heating Activities Technical CO2 laser heating system at GSECARS Component of ID-D upgrade (in progress) Staff: Andy Campbell (50%, beginning July 1) Scientific Thermal pressure studies in laser heated DAC at GPa (Kubo, Duffy, Shen) Finite element modeling of thermal structures in laser-heated diamond cell (Kiefer and Duffy) Ultrahigh P-T studies of crystal structures and phase relations SiO2 (Shieh, Duffy, Shen) MgSiO3 (Shim, Jeanloz, Duffy, Shen) Outreach Laser heating workshop held in March 2004 at APS

Laser-Heated Diamond Anvil Cell

The Computational Grid Finite element modeling (Flexpde) * Local refinement of mesh. * nodes

Temperature Distribution in LHDAC

ΔT axial (K) Predicted Axial Temperature Drop 

YAG:Ce Ruby Ar Silicate + Pt 175  m X-ray fluorescence of YAG:Ce Thermal emission from heated sampleAfter multiple heating cycles Laser heating of Pyrope (Mg 3 Al 2 Si 3 O 12 ) Garnet at ~30 GPa Precision (~3 micron) alignment of heating and x-ray spots achieved using fluorescent YAG:Ce crystals

Highest pressure experiments (stishovite starting material)

Cristobalite starting material

Conclusions: CaCl 2 -phase of SiO 2 stable to 131 GPa (2800 km depth in the mantle) Complications: Kinetic factors/ metastable phases length, homogeneity of heating starting material stishovite (CaCl 2 -type) glass cristobalite deviatoric stress, minor elements low temperature (<1000 K) metastable phases also observed (Prakapenka et al., 2004) Teter et al., 1998

MgSiO 3 perovskite to 116 GPa (2550 km depth) Shim et al., Science 2001; Geophys. Res. Lett., in press.

MgSiO 3 perovskite at 140 GPa Cmcm post-perovskite phase (Murakami et al., Science 2004) + Modified MgSiO 3 perovskite (Shim et al., Science 2001) Shim et al., Geophys. Res. Lett., in press

Enstatite -type Perovskite -type 10 GPa 40 GPa 74 GPa Laser Heating of MgGeO 3 at HPCAT, April, 2004

Laser heating workshop -- March 19-20, 2004 at the Advanced Photon Source participants including representation from Europe, Japan, and the US -- Sponsored by COMPRES and GSECARS -- Invited Speakers: Heinz (Chicago)Yoo (LLNL)Kavner (UCLA) Tschauner (UNLV)Shen (Chicago)Kiefer (NMSU) Shim (MIT)Lin (CIW)Zha (Cornell) Sturhahn (ANL)Meng (HPCAT)Clark (LBNL) Sata (JAMSTEC)Dubrovinsky (Bayreuth) -- Discussion Sessions: What features are required in the next generation laser heating system at GSECARS? What are the key technical issues for next-generation laser heating? What community-wide efforts are needed to advance laser heating capabilities at synchrotrons? -- Dissemination Meeting presentations (PPT) posted at COMPRES website Meeting summary document available for dissemination