TITLE

Extended x-ray absorption fine structure measurements of quasi-isentropically compressed vanadium targets on the OMEGA laser

AUTHOR(S)
Yaakobi, B.; Boehly, T. R.; Sangster, T. C.; Meyerhofer, D. D.; Remington, B. A.; Allen, P. G.; Pollaine, S. M.; Lorenzana, H. E.; Lorenz, K. T.; Hawreliak, J. A.
PUB. DATE
June 2008
SOURCE
Physics of Plasmas;Jun2008, Vol. 15 Issue 6, p062703
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The use of in situ extended x-ray absorption fine structure (EXAFS) for characterizing nanosecond laser-shocked vanadium, titanium, and iron has recently been demonstrated. These measurements are extended to laser-driven, quasi-isentropic compression experiments (ICE). The radiation source (backlighter) for EXAFS in all of these experiments is obtained by imploding a spherical target on the OMEGA laser [T. R. Boehly et al., Rev. Sci. Instrum. 66, 508 (1995)]. Isentropic compression (where the entropy is kept constant) enables to reach high compressions at relatively low temperatures. The absorption spectra are used to determine the temperature and compression in a vanadium sample quasi-isentropically compressed to pressures of up to ∼0.75 Mbar. The ability to measure the temperature and compression directly is unique to EXAFS. The drive pressure is calibrated by substituting aluminum for the vanadium and interferometrically measuring the velocity of the back target surface by the velocity interferometer system for any reflector (VISAR). The experimental results obtained by EXAFS and VISAR agree with each other and with the simulations of a hydrodynamic code. The role of a shield to protect the sample from impact heating is studied. It is shown that the shield produces an initial weak shock that is followed by a quasi-isentropic compression at a relatively low temperature. The role of radiation heating from the imploding target as well as from the laser-absorption region is studied. The results show that in laser-driven ICE, as compared with laser-driven shocks, comparable compressions can be achieved at lower temperatures. The EXAFS results show important details not seen in the VISAR results.
ACCESSION #
32970317

 

Related Articles

  • SEM and EDS Characterisation of Layering TiOx Growth onto the Cutting Tool Surface in Hard Drilling Processes of Ti-Al-V Alloys. Álvarez, M.; Salguero, J.; Sánchez, J. A.; Huerta, M.; Marcos, M. // Advances in Materials Science & Engineering;2011, p1 

    Scanning electron microscopy (SEM) has been used to identify and analyse the secondary adhesion effect precursors formed during the dry drilling processes of Ti-6Al-4V alloy over the rake face and flute of the drilling tools. Subsequent analysis with energy dispersive spectroscopy (EDS) was...

  • Jet-cooled fluorescence excitation spectra and carbonyl wagging and ring-puckering potential energy functions of cyclobutanone and its 2,2,4,4-d4 isotopomer in the S1(n,Ï€*) electronic excited state. Zhang, Jian; Chiang, Whe-Yi; Laane, Jaan // Journal of Chemical Physics;3/1/1994, Vol. 100 Issue 5, p3455 

    The jet-cooled fluorescence excitation spectra of cyclobutanone and its 2,2,4,4-d4 isotopomer have been recorded in the 305–335 nm region. The electronic band origin of the d0 molecule for the S1(n,π*) state of A2 symmetry occurs at 30 292 cm-1 (30 265 cm-1 for the d4 molecule). The...

  • Local structure of porous silicon. Bayliss, S. C.; Anstee, P.; Hutt, D. A.; Zhang, Q.; Danson, N.; Bates, J.; Waddilove, A. // Journal of Applied Physics;11/1/1994, Vol. 76 Issue 9, p5171 

    Investigates the photoluminescence response of porous silicon samples using ultraviolet excitation from the tuneable x-ray source. Information on the x-ray near-edge structure; Mechanisms used to explain the enhanced and shifted emission; Details of the preparation of porous silicon; Methods...

  • Laser-produced reduction of pentavalent vanadium in aqueous solutions and V2O5 powder. Khawaja, E. E.; Khan, M. A.; Al-Adel, F. F.; Hussain, Z. // Journal of Applied Physics;8/1/1990, Vol. 68 Issue 3, p1205 

    Presents a study which confirmed the reduction of pentavalent vanadium ions in aqueous solutions upon laser irradiation by using optical absorption and flourescence techniques. Experimental procedures; Results and discussion; Discussion on x-ray photoelectron spectroscopy and Auger spectra.

  • Investigations of natTi(d,x)48V nuclear reactions for beam monitoring purposes. Khandaker, Mayeen Uddin; Haba, Hiromitsu; Kanaya, Jumpei; Otuka, Naohiko; Kassim, Hasan Abu; Amin, Yusoff Mohd // AIP Conference Proceedings;May2013, Vol. 1528 Issue 1, p433 

    We investigated the natTi(d,x)48V reaction cross-sections by using a stacked-foil activation technique in combination with HPGe γ-ray spectrometry at the AVF cyclotron facility of the RIKEN RI Beam Factory, Wako, Japan. An overall good agreement is found between the measured data and the...

  • X-ray microdiffraction study of Cu interconnects. Zhang, X.; Solak, H.; Cerrina, F.; Lai, B.; Cai, Z.; Ilinski, P.; Legnini, D.; Rodrigues, W. // Applied Physics Letters;1/17/2000, Vol. 76 Issue 3 

    We have used x-ray microdiffraction to study the local structure and strain variation of copper interconnects. Different types of local microstructures have been found in different samples. Our data show that the Ti adhesion layer has a very dramatic effect on Cu microstructure. Strain...

  • Influence of Hydrogen Contents of Ti-6Al-4V Alloy on Friction and Wear Mechanism between Titanium Alloy and Cemented Carbide. Wei Wei-hua; Xu Jiu-hua; Fu Yu-can // Key Engineering Materials;2014, Vol. 584, p34 

    Ti-6Al-4V alloy was hydrogenated at 800°C by thermohydrogen treatment technology. Sliding friction and wear tests were carried out in a special device assembled on CA6140 turning lathe to investigate the friction and wear mechanism between hydrogenated titanium alloys and WC-Co cemented...

  • X-ray Optic Characteristics of Microchannel Plates Studied by X-ray Absorption Spectroscopy. Mazuritskii, M. I.; Soldatov, A. V.; Kasrai, M. // Technical Physics Letters;Apr2005, Vol. 31 Issue 4, p277 

    The X-ray absorption spectra of white and black microchannel plates (MCPs) have been studied in the energy range from 80 to 250 eV. Data on the fine X-ray absorption near edge structure are presented. A new approach is described, which allows the effect of various treatments on the X-ray optic...

  • Laser induced fluorescence spectroscopy of the C3N radical. Hoshina, Kennosuke; Endo, Yasuki // Journal of Chemical Physics;11/14/2007, Vol. 127 Issue 18, p184304 

    Electronic spectra of the C3N radical have been observed for the first time in the near ultraviolet wavelength region by laser induced fluorescence (LIF) spectroscopy. Seventeen vibronic bands of the B 2Πi–X 2Σ+ electronic transition system of C3N were identified in LIF spectra of...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics