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Physics of Plasmas / Volume 18 / Issue 9 / ARTICLES / Inertially Confined Plasmas, High Energy Density Plasma Science, Warm Dense Matter

Phys. Plasmas 18, 092703 (2011); http://dx.doi.org/10.1063/1.3624497 (9 pages)

Experimental demonstration of early time, hohlraum radiation symmetry tuning for indirect drive ignition experiments

E. L. Dewald1, J. Milovich1, C. Thomas1, J. Kline2, C. Sorce1, S. Glenn1, and O. L. Landen1

1Lawrence Livermore National Laboratory, Livermore, California 94550, USA
2Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA

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(Received 27 May 2011; accepted 14 July 2011; published online 8 September 2011)

Early time radiation symmetry at the capsule for indirect drive ignition on the National Ignition Facility (NIF) [G. H. Miller, E. I. Moses, and C. R. Wuest, Nucl. Fusion 44, 228 (2004)] will be inferred from the instantaneous soft x-ray re-emission pattern of a high-Z sphere replacing the ignition capsule. This technique was tested on the OMEGA laser facility [J. M. Soures, R. L. McCrory, T. Boehly et al., Laser Part. Beams 11, 317 (1991)] in near full ignition scale vacuum hohlraums using an equivalent experimental setup to the one planned for NIF. Two laser cones entering each laser entrance hole heat the hohlraums to radiation temperatures of 100 eV, mimicking the NIF ignition pulse foot drive. The experiments have demonstrated accuracies of ±1.5% (±2%) in inferred P2/P0 (P4/P0) Legendre mode incident flux asymmetry and consistency between 900 eV and 1200 eV re-emission patterns. We have also demonstrated the expected tuning capability of P2/P0, from positive (pole hot) to negative (waist hot), decreasing linearly with the inner/outer beams power fraction. P4/P0 on the other hand shows very little variation with power fraction. We developed a simple analytical viewfactor model that is in good agreement with both measured P2/P0 and P4/P0 and their dependence on inner beam power fraction.

© 2011 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. EXPERIMENTAL SETUP
  3. RE-EMIT EXPERIMENTS IN 0.9 IGNITION-SCALE VACUUM HOHLRAUMS ON THE OMEGA LASER FACILITY
  4. EXPERIMENTAL RESULTS ON THE OMEGA LASER
  5. DATA COMPARISON TO ANALYTICAL MODEL
  6. SUMMARY

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KEYWORDS and PACS

Keywords

plasma diagnostics, plasma inertial confinement, plasma light propagation, plasma temperature, plasma X-ray sources

PACS

  • 52.25.Os

    Emission, absorption, and scattering of electromagnetic radiation

  • 52.57.Kk

    Fast ignition of compressed fusion fuels

  • 52.70.La

    X-ray and γ-ray measurements

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3624497

PUBLICATION DATA

ISSN

1070-664X (print)  
1089-7674 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

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