TITLE

Laser wakefield generated X-ray probe for femtosecond time-resolved measurements of ionization states of warm dense aluminum

AUTHOR(S)
Mo, M. Z.; Chen, Z.; Fourmaux, S.; Saraf, A.; Otani, K.; Kieffer, J. C.; Tsui, Y. Y.; Ng, A.; Fedosejevs, R.
PUB. DATE
December 2013
SOURCE
Review of Scientific Instruments;Dec2013, Vol. 84 Issue 12, p123106
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We have developed a laser wakefield generated X-ray probe to directly measure the temporal evolution of the ionization states in warm dense aluminum by means of absorption spectroscopy. As a promising alternative to the free electron excited X-ray sources, Betatron X-ray radiation, with femtosecond pulse duration, provides a new technique to diagnose femtosecond to picosecond transitions in the atomic structure. The X-ray probe system consists of an adjustable Kirkpatrick-Baez (KB) microscope for focusing the Betatron emission to a small probe spot on the sample being measured, and a flat Potassium Acid Phthalate Bragg crystal spectrometer to measure the transmitted X-ray spectrum in the region of the aluminum K-edge absorption lines. An X-ray focal spot size of around 50 μm was achieved after reflection from the platinum-coated 10-cm-long KB microscope mirrors. Shot to shot positioning stability of the Betatron radiation was measured resulting in an rms shot to shot variation in spatial pointing on the sample of 16 μm. The entire probe setup had a spectral resolution of ∼1.5 eV, a detection bandwidth of ∼24 eV, and an overall photon throughput efficiency of the order of 10-5. Approximately 10 photons were detected by the X-ray CCD per laser shot within the spectrally resolved detection band. Thus, it is expected that hundreds of shots will be required per absorption spectrum to clearly observe the K-shell absorption features expected from the ionization states of the warm dense aluminum.
ACCESSION #
93390555

 

Related Articles

  • The Oxford-Diamond In Situ Cell for studying chemical reactions using time-resolved X-ray diffraction. Moorhouse, Saul J.; Vranjesˇ, Nenad; Jupe, Andrew; Drakopoulos, Michael; O'Hare, Dermot // Review of Scientific Instruments;Aug2012, Vol. 83 Issue 8, p084101 

    A versatile, infrared-heated, chemical reaction cell has been assembled and commissioned for the in situ study of a range of chemical syntheses using time-resolved energy-dispersive X-ray diffraction (EDXRD) on Beamline I12 at the Diamond Light Source. Specialized reactor configurations have...

  • Frequency dependence of electron dynamics during femtosecond laser resonant photoionization of Li4 cluster. Wang, Cong; Jiang, Lan; Li, Xin; Wang, Feng; Yuan, Yanping; Yuan, Lei; Qu, Liangti; Duan, Ji'an // Journal of Applied Physics;Oct2013, Vol. 114 Issue 14, p143105 

    This study investigates the resonant effects on nonlinear photoionization of Li4 cluster under femtosecond laser irradiation. The real-time and real-space time-dependent density functional theory is applied to describe the optical linear response and nonlinear electron dynamics during the...

  • K-shell ionization cross section of aluminium induced by low-energy highly charged argon ions. Chen, X. M.; Shao, J. X.; Yang, Z. H.; Zhang, H. Q.; Cui, Y.; Xu, X.; Xiao, G. Q.; Zhao, Y. T.; Zhang, X. A.; Zhang, Y. P. // European Physical Journal D -- Atoms, Molecules, Clusters & Opti;Feb2007, Vol. 41 Issue 2, p281 

    Al K-shell X-ray yields are measured with highly charged Arq+ ions (q=12–16) bombarding against aluminium. The energy range of the Ar ions is from 180 to 380 keV. K-shell ionization cross sections of aluminium are also obtained from the yields data. The experimental data is explained...

  • Kilovolt radiation from a laser-produced Al plasma. Cobble, J. A.; Tierney, T. E.; Abdallah, J. // Journal of Applied Physics;7/15/2007, Vol. 102 Issue 2, p023303 

    We have characterized kilo-electron-volt (keV) emission from Al plasmas for various laser illuminations at the OMEGA laser with the goal of optimizing the ability to backlight low-atomic-number materials such as beryllium for fusion ignition studies. The plasma is diagnosed by...

  • Collisionally pumped Ni-like and Pd-like optical field ionization soft x-ray lasers. Sebban, S.; Mocek, T.; Ros, D.; Upcraft, L.; Balcou, Ph.; Haroutunian, R.; Grillon, G.; Rus, B.; Klisnick, A.; Carillon, A.; Jamelot, G.; Valentin, C.; Rousse, A.; Rousseau, J. P.; Notebaert, L.; Pittman, M.; Hulin, D. // AIP Conference Proceedings;2002, Vol. 641 Issue 1, p204 

    We report recent investigations of Optical-Field Ionization soft-x ray lasers. A gain of 67 cm[SUP-1] on the 4d[SUP9]5p-4d[SUP9]5d transition at 41.8 nm in Pd-like xenon and a gain-length product of 15 have been inferred at saturation. This source delivers about 5x10[SUP9] photons per pulse....

  • An X-ray preionised self sustained discharge HF/DF laser. Anderson, N.; Bearpark, T.; Scott, S. J. // Applied Physics B: Lasers & Optics;1996, Vol. 63 Issue 6, p565 

    We report the design and characterisation of a flash X-ray preionised, transversely excited HF/DF laser with energy outputs at the joule level. The laser used a H[sub 2] /D[sub 2] : SF[sub 6] mixture at a pressure of around 120 Torr. X-ray photon fluxes and ionisation rates in the laser gas are...

  • Tabletop x-ray lasers*. Eder, D.C.; Amendt, P.; DaSilva, L.B.; London, R.A.; MacGowan, B.J.; Matthews, D.L.; Penetrante, B.M.; Rosen, M.D.; Wilks, S.C.; Donnelly, T.D.; Falcone, R.W.; Strobel, G.L. // Physics of Plasmas;May94, Vol. 1 Issue 5, p1744 

    Discusses details of schemes for two tabletop size x-ray lasers that require a high-intensity short-pulse driving laser. Propagation in the confocal geometry; Methods of calculating electron heating following field ionization; Experiments that are possible with existing lasers.

  • 50 & 100 Years Ago. Arnott, Struther; Bragg, W. H. // Nature;1/24/2013, Vol. 493 Issue 7433, p484 

    The article discusses news reported in the journal years ago that includes the development of X-ray crystallographic techniques as a structure-determining tool, and measuring the ionisation produced by the radiation reflected by crystals.

  • Toward elucidating the mechanism of femtosecond pulse shaping control in photodynamics of molecules by velocity map photoelectron and ion imaging. Irimia, Daniel; Janssen, Maurice H. M. // Journal of Chemical Physics;6/21/2010, Vol. 132 Issue 23, p234302 

    The control of photofragmentation and ionization in a polyatomic molecule has been studied by femtosecond chirped laser pulse excitation and velocity map photoelectron and ion imaging. The experiments aimed at controlling and investigating the photodynamics in CH2BrCl using tunable chirped...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

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

Try another library?
Sign out of this library

Other Topics