Title: Fresnel zone plate development for x-ray radiography of hydrodynamic instabilities at the National Ignition Facility

Abstract

The study of Rayleigh–Taylor (RT) and Richtmyer–Meshkov (RM) instabilities in a planar geometry at high energy densities at the National Ignition Facility (NIF) requires high spatial resolution imaging. We demonstrate the potential of Fresnel zone plates (FZPs) to achieve resolution that would unlock such studies. FZPs are circular aperiodic gratings that use diffraction to focus x rays and produce an image with high spatial resolution. Taking into account the NIF’s challenging environment, we have designed a specific array of five FZPs for a zinc backlighter to take a radiograph of a target with 9 keV x rays. We measured a mean resolution for the FZP of $1.9\text{µ <\#comment/>}\mathrm{m}\pm \; <\#comment/>0.5\text{µ <\#comment/>}\mathrm{m}$ and a $\pm \; <\#comment/>1\mathrm{m}\mathrm{m}$ depth of focus at an x-ray calibration facility as well as a $2.3\text{µ <\#comment/>}\mathrm{m}\pm \; <\#comment/>0.4\text{µ <\#comment/>}\mathrm{m}$ resolution on a resolution wire mesh shot on the NIF. We also performed an in-depth analysis of the image quality to assess the capability to resolve the small features present in RT and RM instabilities.

Authors:

Do, Alexandre  ^[1];

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Pickworth, Louisa A. ^[2]; Kozioziemski, Bernard J. ^[1]; Angulo, Adrianna M. ^[3]; Hall, Gareth N. ^[1]; Nagel, Sabrina R. ^[1]; Bradley, David K. ^[1]; Mccarville, Tom ^[1]; Ayers, Jay M. ^[1]

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+ Show Author Affiliations

1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lund Univ. (Sweden)
3. Univ. of Michigan, Ann Arbor, MI (United States)

Publication Date:

Mon Nov 30 00:00:00 EST 2020

Research Org.:

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1783918

Alternate Identifier(s):

OSTI ID: 1781484

Report Number(s):

LLNL-JRNL-813934
Journal ID: ISSN 1559-128X; 1021528; TRN: US2210154

Grant/Contract Number:  

AC52-07NA27344

Resource Type:

Accepted Manuscript

Journal Name:

Applied Optics

Additional Journal Information:

Journal Volume: 59; Journal Issue: 34; Journal ID: ISSN 1559-128X

Publisher:

Optical Society of America

Country of Publication:

United States

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY