Experimental Investigation of MeV X-ray Spectra and Dose Scaling in High-Energy-Density Plasmas in the multi-picosecond regime

POSTER

Abstract

X-ray backlighting aids in extracting various physical properties from the system. The use of high-intensity lasers focused on high-Z foil targets produce relativistic electrons that generate MeV photons via Bremsstrahlung, Compton scattering, and synchrotron emission. The advantages over existing sources include smaller spot size, shorter pulse duration, tailorable spectra, and flexible configurations. This enables imaging with higher spatial and temporal resolution and multiple fields of view. However, certain limiting factors such as energy conversion efficiency, spectra optimization, and source stability must be addressed to achieve such a source. Recent experiments with 1 mm thick W targets at the OMEGA-EP laser explore MeV X-ray spectra and dose scaling with intensity (> 1019 W/cm2), energy (0.125 - 1.25 KJ), and pulse duration (0.5 -10 ps). We also report on shots using CH-coated targets with the goal of increased Bremsstrahlung production from increased laser-energy coupling and enhanced electron temperature. The resulting spectra were obtained using an iterative unfolding algorithm based on VPIC and MNCP transport codes that model the generation of hot-electrons and X-rays. For more details, we encourage you to refer to the contributed talk presented by Dr. Brian J. Albright.

*The experiment was conducted at the Omega Laser Facility at the University of Rochester's Lab- oratory for Laser Energetics with the beam time through the LANL Programmatic Allocations. This work was performed under the auspices of the U.S. DOE by Triad National Security, LLC, and Los Alamos National Laboratory. This work was supported by the LANL Laboratory Directed Re- search and Development program. Alemayehu Solomon Bogale was supported by the Department of Energy, National Nuclear Security Administration under Award Number(s) DE-NA0003842

Presenters

  • Alemayehu Bogale

    • University of California, San Diego

Authors

  • Alemayehu Bogale

    • University of California, San Diego

  • Farhat Beg

    • University of California, San Diego
    • University of California San Diego
    • Center for Energy Research UC San Diego, San Diego, CA 92093

  • Joshua E Coleman

    • Los Alamos Natl Lab

  • Juan C Fernandez

    • Los Alamos Natl Lab

  • Rebecca J Fitzgarrald

    • University of Michigan

  • Cort C Gautier

    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA
    • Los Alamos National Laboratory
    • Los Alamos National Laboratory, USA

  • Chengkun Huang

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA

  • Christopher E Hamilton

    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA
    • Los Alamos National Laboratory
    • LANL
    • Los Alamos Natl Lab

  • James Hunter

    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA
    • Los Alamos National Laboratory
    • LANL
    • Los Alamos Natl Lab

  • Marc Klasky

    • Los Alamos National Laboratory
    • LANL

  • Scott V Luedtke

    • Los Alamos National Laboratory

  • Albert J Mendez

    • Los Alamos National Laboratory

  • Tyler Mix

    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA
    • LANL
    • Los Alamos Natl Lab
    • Los Alamos National Lab

  • Sasi Palaniyappan

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory
    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA
    • Los Alamos National Lab

  • Matthew Schmitt

    • Los Alamos National Laboratory

  • Alexander G Seaton

    • Los Alamos National Laboratory
    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA

  • Avneet Sood

    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA
    • Los Alamos National Laboratory
    • LANL
    • Los Alamos Natl Lab

  • David Stark

    • Los Alamos National Laboratory

  • Christopher Tomkins

    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA
    • Los Alamos National Laboratory
    • LANL
    • Los Alamos Natl Lab

  • Justin Twardowski

    • The Ohio State University
    • OSU

  • Ashlyn Van Pelt

    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA
    • Los Alamos National Laboratory
    • LANL
    • Los Alamos Natl Lab

  • Lin Yin

    • Los Alamos Natl Lab

  • Brian J Albright

    • Los Alamos Natl Lab
    • Los Alamos National Laboratory, Los Alamos, NM 87544, USA

  • Benjamin J Jones

    • Los Alamos National Laboratory
    • LANL
    • Los Alamos Natl Lab