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X-ray shadow imprint of hydrodynamic instabilities on the surface of inertial confinement fusion capsules by the fuel fill tube

A. G. MacPhee1, D. T. Casey1, D. S. Clark1, S. Felker1, J. E. Field1, S. W. Haan1, B. A. Hammel1, J. Kroll1, O. L. Landen1 et al.

D. A. Martinez1, P. Michel1, J. Milovich1, A. Moore1, A. Nikroo1, N. Rice2, H. F. Robey1, V. A. Smalyuk1, M. Stadermann1, and C. R. Weber1

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  • 2General Atomics, P.O. Box 85608, San Diego, California 92186-5608, USA

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Phys. Rev. E 95, 031204(R) – Published 30 March, 2017

DOI: https://doi.org/10.1103/PhysRevE.95.031204

Abstract

Measurements of hydrodynamic instability growth for a high-density carbon ablator for indirectly driven inertial confinement fusion implosions on the National Ignition Facility are reported. We observe significant unexpected features on the capsule surface created by shadows of the capsule fill tube, as illuminated by laser-irradiated x-ray spots on the hohlraum wall. These shadows increase the spatial size and shape of the fill tube perturbation in a way that can significantly degrade performance in layered implosions compared to previous expectations. The measurements were performed at a convergence ratio of ∼2 using in-flight x-ray radiography. The initial seed due to shadow imprint is estimated to be equivalent to ∼50–100 nm of solid ablator material. This discovery has prompted the need for a mitigation strategy for future inertial confinement fusion designs as proposed here.

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Corrections

16 June, 2017

Erratum

Publisher's Note: X-ray shadow imprint of hydrodynamic instabilities on the surface of inertial confinement fusion capsules by the fuel fill tube [Phys. Rev. E 95, 031204(R) (2017)]

A. G. MacPhee, D. T. Casey, D. S. Clark, S. Felker, J. E. Field, S. W. Haan, B. A. Hammel, J. Kroll, O. L. Landen, D. A. Martinez, P. Michel, J. Milovich, A. Moore, A. Nikroo, N. Rice, H. F. Robey, V. A. Smalyuk, M. Stadermann, and C. R. Weber
Phys. Rev. E 95, 069905 (2017)

Article Text

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Outline

Information

Phys. Rev. E 95, 031204(R)– Published 30 March, 2017
  • Received 14 October 2016
  • Revised 19 January 2017
  • Corrected 16 June 2017
Article part of CHORUS

©2017 American Physical Society

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