skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Using high-intensity laser-generated energetic protons to radiograph directly driven implosions

Abstract

The recent development of petawatt-class lasers with kilojoule-picosecond pulses, such as OMEGA EP [L. Waxer et al., Opt. Photonics News 16, 30 (2005)], provides a new diagnostic capability to study inertial-confinement-fusion (ICF) and high-energy-density (HED) plasmas. Specifically, petawatt OMEGA EP pulses have been used to backlight OMEGA implosions with energetic proton beams generated through the target normal sheath acceleration (TNSA) mechanism. This allows time-resolved studies of the mass distribution and electromagnetic field structures in ICF and HED plasmas. This principle has been previously demonstrated using Vulcan to backlight six-beam implosions [A. J. Mackinnon et al., Phys. Rev. Lett. 97, 045001 (2006)]. The TNSA proton backlighter offers better spatial and temporal resolution but poorer spatial uniformity and energy resolution than previous D{sup 3}He fusion-based techniques [C. Li et al., Rev. Sci. Instrum. 77, 10E725 (2006)]. A target and the experimental design technique to mitigate potential problems in using TNSA backlighting to study full-energy implosions is discussed. The first proton radiographs of 60-beam spherical OMEGA implosions using the techniques discussed in this paper are presented. Sample radiographs and suggestions for troubleshooting failed radiography shots using TNSA backlighting are given, and future applications of this technique at OMEGA and the NIF are discussed.

Authors:
; ; ; ;  [1]; ; ; ;  [2]; ; ;  [3]
  1. Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
  2. Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)
  3. Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
Publication Date:
OSTI Identifier:
22063775
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 83; Journal Issue: 1; Other Information: (c) 2012 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0034-6748
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ELECTROMAGNETIC FIELDS; ENERGY DENSITY; ENERGY RESOLUTION; ICF DEVICES; IMAGES; IMPLOSIONS; INERTIAL CONFINEMENT; ION BEAM TARGETS; OMEGA FACILITY; PLASMA DENSITY; PLASMA SHEATH; PROTON BEAMS; PROTON RADIOGRAPHY; TIME RESOLUTION; US NATIONAL IGNITION FACILITY

Citation Formats

Zylstra, A B, Li, C K, Rinderknecht, H G, Seguin, F H, Petrasso, R D, Stoeckl, C, Meyerhofer, D D, Nilson, P, Sangster, T C, Le Pape, S, Mackinnon, A, and Patel, P. Using high-intensity laser-generated energetic protons to radiograph directly driven implosions. United States: N. p., 2012. Web. doi:10.1063/1.3680110.
Zylstra, A B, Li, C K, Rinderknecht, H G, Seguin, F H, Petrasso, R D, Stoeckl, C, Meyerhofer, D D, Nilson, P, Sangster, T C, Le Pape, S, Mackinnon, A, & Patel, P. Using high-intensity laser-generated energetic protons to radiograph directly driven implosions. United States. doi:10.1063/1.3680110.
Zylstra, A B, Li, C K, Rinderknecht, H G, Seguin, F H, Petrasso, R D, Stoeckl, C, Meyerhofer, D D, Nilson, P, Sangster, T C, Le Pape, S, Mackinnon, A, and Patel, P. Sun . "Using high-intensity laser-generated energetic protons to radiograph directly driven implosions". United States. doi:10.1063/1.3680110.
@article{osti_22063775,
title = {Using high-intensity laser-generated energetic protons to radiograph directly driven implosions},
author = {Zylstra, A B and Li, C K and Rinderknecht, H G and Seguin, F H and Petrasso, R D and Stoeckl, C and Meyerhofer, D D and Nilson, P and Sangster, T C and Le Pape, S and Mackinnon, A and Patel, P},
abstractNote = {The recent development of petawatt-class lasers with kilojoule-picosecond pulses, such as OMEGA EP [L. Waxer et al., Opt. Photonics News 16, 30 (2005)], provides a new diagnostic capability to study inertial-confinement-fusion (ICF) and high-energy-density (HED) plasmas. Specifically, petawatt OMEGA EP pulses have been used to backlight OMEGA implosions with energetic proton beams generated through the target normal sheath acceleration (TNSA) mechanism. This allows time-resolved studies of the mass distribution and electromagnetic field structures in ICF and HED plasmas. This principle has been previously demonstrated using Vulcan to backlight six-beam implosions [A. J. Mackinnon et al., Phys. Rev. Lett. 97, 045001 (2006)]. The TNSA proton backlighter offers better spatial and temporal resolution but poorer spatial uniformity and energy resolution than previous D{sup 3}He fusion-based techniques [C. Li et al., Rev. Sci. Instrum. 77, 10E725 (2006)]. A target and the experimental design technique to mitigate potential problems in using TNSA backlighting to study full-energy implosions is discussed. The first proton radiographs of 60-beam spherical OMEGA implosions using the techniques discussed in this paper are presented. Sample radiographs and suggestions for troubleshooting failed radiography shots using TNSA backlighting are given, and future applications of this technique at OMEGA and the NIF are discussed.},
doi = {10.1063/1.3680110},
journal = {Review of Scientific Instruments},
issn = {0034-6748},
number = 1,
volume = 83,
place = {United States},
year = {2012},
month = {1}
}