X-Ray Backlighting for the National Ignition Facility

  title={X-Ray Backlighting for the National Ignition Facility},
  author={Otto L. Landen and David Rushton Farley and Sharon Gail Glendinning and E M Logory and Perry M. Bell and J. A. Koch and F. Dean Lee and Donal Bradely and D H Kalantar and Christina A. Back and Robert E. L. Turner},
X-ray backlighting is a powerful tool for diagnosing a large variety of high-energy-density phenomena. Traditional area backlighting techniques used at Nova and Omega cannot be extended efficiently to NIF-scale. New, more efficient backlighting sources and techniques are required and have begun to show promising results. These include a backlit-pinhole point projection technique, pinhole and slit arrays, distributed polychromatic sources, and picket fence backlighters. In parallel, there have… 

Development of a short duration backlit pinhole for radiography on the National Ignition Facility.

A vanadium pinhole backlighter producing (1.8±0.5)×10(15) x-ray photons into 4π sr near the vanadium He-like characteristic x-rays energy of 5.18 keV is detailed.

Improved pinhole-apertured point-projection backlighter geometry

Pinhole-apertured point-projection x-ray radiography is an important diagnostic technique for obtaining high resolution, high contrast, and large field-of-view images used to diagnose the

Uniform large-area x-ray imaging at 9 keV using a backlit pinhole.

The results of a Zn 9 keV point-backlighter source are presented using the technique of pinhole aperturing to define the source size and hence the resolution.

Mitigation of hard x-ray background in backlit pinhole imagers.

Experiments performed to mitigate the hard x-ray background commonly observed in backlit pinhole imagers found a potential design using V scaffold offers a signal-to-background ratio of 6:1, a factor of 2 greater than using the bare plastic scaffold.

Development of intense point x-ray sources for backlighting high energy density experiments (invited)

High-energy-density (HED) experiments are often diagnosed using x-ray backlighting. Recently, experiments have been designed and fielded that require x-ray backlighting having large fields of view

High-energy point-projection radiography of a driven, shielded Hohlraum

Point projection backlighting is a high magnification, high resolution x-ray backlighting configuration that provides detailed images of large objects at a reduced energy budget compared to area

Debris mitigation in pinhole-apertured point-projection backlit imaging

Pinhole-apertured point-projection x-ray radiography is an important diagnostic technique for obtaining high resolution, high contrast, and large field-of-view images used to diagnose the

Single line-of-sight dual energy backlighter for mix width experiments.

Initial experimental results testing the backlighter spectrum are presented along with simulated images showing the calculated radiographic images though the nickel picket fence filter which are used to measure the mix width in an accelerated nickel foam.

Close-in nosecone configuration and blast damage in point backlight x-ray radiography

Radiography of driven targets using point projection backlighting often requires extensive baffling to mitigate background x rays and physical damage due to target debris. One solution to this

Monochromatic x-ray radiography for areal-density measurement of inertial fusion energy fuel in fast ignition experiment.

In the experiment, 2.8 or 5.2 keV backlight x-rays emitted from laser-irradiated polyvinyl chloride or vanadium foils were selectively imaged by spherically bent quartz crystals with discriminating the out-of-band emission from the fuel core, achieving 24 μm and 100 ps of spatial and temporal resolutions, respectively.



Composite x-ray pinholes for time-resolved microphotography of laser compressed targets.

Mating the pinhole camera with an x-ray streaking camera is described, along with experiments which spatially and temporally resolve the implosion of laser irradiated targets.

Spatial resolution of gated x-ray pinhole cameras

We have conducted an investigation of the spatial resolution of a new gated x-ray pinhole camera (FXI). The spatial resolution, or its Fourier transform the modulation transfer function (MTF), is

X-ray backlighting imaging of mixed imploded targets

The X-ray image of a compressed shell (enhanced by high-Z doping) was used in recent experiments to diagnose the effect of shell-fuel mixing. The emission ring (due to the limb effect) moves toward

Point projection radiography with the flexible x-ray imager

Radiography techniques utilizing large-area x-ray sources (typically ⩽7 keV) and pinhole-imaging gated x-ray diagnostics have long been used at the Nova laser facility. However, for targets requiring

X-ray backlit imaging measurement of in-flight pusher density for an indirect drive capsule implosion

Both the efficiency of an implosion and the growth rate of hydrodynamic instability increase with the aspect ratio of an implosion. In order to study the physics of implosions with high

High energy x ray imaging diagnostic on Nova

We have developed a diagnostic suitable for high photon energy ({approximately}7 kev) time resolved one dimensional x-ray imaging on Nova. This diagnostic using a 15 {mu}m wide, 750 {mu}m long

High-Energy X-ray Microscopy Techniques for Laser-Fusion Plasma Research at the National Ignition Facility.

It is concluded that near-normal-incidence single spherical or toroidal crystals may offer the best general solution for high-energy x-ray microscopy at NIF and similar large facilities.

X-ray absorption spectroscopy of laser-produced plasmas: A study of the experiment and data analysis.

  • BalmerLewis Lee
  • Physics
    Physical review. A, General physics
  • 1989
The novel technique of point-projection backlighting is used to probe a laser-produced plasma using both low-Z and high-Z elements for backlighting to obtain temporal resolution of the absorption spectrum.