Observation of a Reflected Shock in an Indirectly Driven Spherical Implosion at the National Ignition Facility

S. Le Pape, L. Divol, L. Berzak Hopkins, A. Mackinnon, N. B. Meezan, D. Casey, J. Frenje, H. Herrmann, J. McNaney, T. Ma, K. Widmann, A. Pak, G. Grimm, J. Knauer, R. Petrasso, A. Zylstra, H. Rinderknecht, M. Rosenberg, M. Gatu-Johnson, and J. D. Kilkenny

Phys. Rev. Lett. 112, 225002 – Published 4 June 2014

Abstract

A $200 μ m$ radius hot spot at more than 2 keV temperature, $1 g / {cm}^{3}$ density has been achieved on the National Ignition Facility using a near vacuum hohlraum. The implosion exhibits ideal one-dimensional behavior and 99% laser-to-hohlraum coupling. The low opacity of the remaining shell at bang time allows for a measurement of the x-ray emission of the reflected central shock in a deuterium plasma. Comparison with 1D hydrodynamic simulations puts constraints on electron-ion collisions and heat conduction. Results are consistent with classical (Spitzer-Harm) heat flux.

Received 8 November 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.225002

Authors & Affiliations

S. Le Pape¹, L. Divol¹, L. Berzak Hopkins¹, A. Mackinnon¹, N. B. Meezan¹, D. Casey¹, J. Frenje², H. Herrmann³, J. McNaney¹, T. Ma¹, K. Widmann¹, A. Pak¹, G. Grimm³, J. Knauer⁴, R. Petrasso², A. Zylstra², H. Rinderknecht², M. Rosenberg², M. Gatu-Johnson², and J. D. Kilkenny⁵

¹Lawrence Livermore National Laboratory, Livermore, California 94550, USA
²Plasma Science and Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
³Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁴Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623, USA
⁵General Atomics Corporation, La Jolla, California 92121, USA

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Vol. 112, Iss. 22 — 6 June 2014

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