Resolving hot spot microstructure using x-ray penumbral imaging (invited)

被引：52

作者：

Bachmann, B. ^{[1
]}

Hilsabeck, T. ^{[2
]}

Field, J. ^{[1
]}

Masters, N. ^{[1
]}

Reed, C. ^{[2
]}

Pardini, T. ^{[1
]}

Rygg, J. R. ^{[1
]}

Alexander, N. ^{[2
]}

Benedetti, L. R. ^{[1
]}

Doppner, T. ^{[1
]}

Forsman, A. ^{[2
]}

Izumi, N. ^{[1
]}

LePape, S. ^{[1
]}

Ma, T. ^{[1
]}

MacPhee, A. G. ^{[1
]}

Nagel, S. ^{[1
]}

Patel, P. ^{[1
]}

Spears, B. ^{[1
]}

Landen, O. L. ^{[1
]}

机构：

[1] Lawrence Livermore Natl Lab, Livermore, CA 94550 USA

[2] Gen Atom, San Diego, CA 92186 USA

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 2016年 / 87卷 / 11期

关键词：

FUSION-TARGETS; PLASMAS;

D O I：

10.1063/1.4959161

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We have developed and fielded x-ray penumbral imaging on the National Ignition Facility in order to enable sub-10 mu m resolution imaging of stagnated plasma cores (hot spots) of spherically shock compressed spheres and shell implosion targets. By utilizing circular tungsten and tantalum apertures with diameters ranging from 20 mu m to 2 mm, in combination with image plate and gated x-ray detectors as well as imaging magnifications ranging from 4 to 64, we have demonstrated high-resolution imaging of hot spot plasmas at x-ray energies above 5 keV. Here we give an overview of the experimental design criteria involved and demonstrate the most relevant influences on the reconstruction of x-ray penumbral images, as well as mitigation strategies of image degrading effects like over-exposed pixels, artifacts, and photon limited source emission. We describe experimental results showing the advantages of x-ray penumbral imaging over conventional Fraunhofer and photon limited pinhole imaging and showcase how internal hot spot microstructures can be resolved. Published by AIP Publishing.

引用

页数：7

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