Time resolved inner-shell spectroscopy of laser produced plasmas using a HOPG crystal in Von Hamos geometry

POSTER

Abstract

Time resolved heat transport in warm dense matter, an essential component of the Fast Ignition concept, has been studied using inner-shell spectra from Ti and Al/Ti/Al foils. Thermal emission is generated by irradiation with either 527 nm and 1ns or 1053 nm and 5 ps pulses using the Vulcan laser at RAL. Fluorescence emission was recorded with a ZYA grade HOPG crystal used in mosaic focusing mode and Von Hamos geometry. The crystal was coupled with a Kentech Low Magnification Streak Camera, fitted with a fluffy CsI photocathode, providing a temporal resolution of about 50 ps. Although the small dynamic range of the streak camera restricts measurement of the full duration of He-alpha emission, our data indicates that the FWHM duration of the resonance line is approximately 1.5 ns when the Ti foil is irradiated with 1 ns pulses.

*This work was partially funded by the US DOE by the University of California Lawrence Livermore National Laboratory under contract no. W-7405-ENG-48 and by the US Office of Fusion Energy Science.

Authors

  • R.L. Weber

    • The Ohio State University

  • Richard Freeman

    • College of Mathematical and Physical Sciences, Ohio State University, Columbus, Ohio 43210

  • L. Van Woerkom

    • The Ohio State University

  • A. MacKinnon

    • Lawrence Livermore National Lab

  • A.G. MacPhee

  • R. Dickson

  • D. Hey

    • Lawrence Livermore National Lab

  • F. Khattak

  • E. Garcia Saiz

    • Queens University of Belfast, N. Ireland, UK

  • D. Riley

    • Queens University of Belfast

  • S.N. Chen

    • University of California, San Diego

  • F.N. Beg

    • University of California
    • University of California, San Diego

  • R.B. Stephens

    • General Atomics

  • M. Notley

  • D. Neely

  • G. Gregori

    • Rutherford Appleton Laboratory