Recording system upgrade for the Dante x-ray diagnostic on the National Ignition Facility

2017 ◽  
Author(s):  
Perry M. Bell ◽  
Todd J. Clancy ◽  
Bart V. Beeman ◽  
Alastair S. Moore ◽  
Benjamin Prat ◽  
...  
Keyword(s):  
Recording System ◽  
National Ignition Facility ◽  
X Ray

scholarly journals Investigation of high X-ray conversion efficiency Kr filled gas sources at the National Ignition Facility

2019 ◽  
Vol 26 (6) ◽  
pp. 063105 ◽  
Author(s):  
M. J. May ◽  
G. E. Kemp ◽  
J. D. Colvin ◽  
D. A. Liedahl ◽  
P. L. Poole ◽  
...  
Keyword(s):  
Conversion Efficiency ◽  
National Ignition Facility ◽  
X Ray

scholarly journals Multi-keV x-ray source development experiments on the National Ignition Facility

2010 ◽  
Vol 17 (8) ◽  
pp. 082701 ◽  
Author(s):  
K. B. Fournier ◽  
M. J. May ◽  
J. D. Colvin ◽  
J. O. Kane ◽  
M. Schneider ◽  
...  
Keyword(s):  
National Ignition Facility ◽  
X Ray

scholarly journals Capsule design for the National Ignition Facility

1999 ◽  
Vol 17 (2) ◽  
pp. 217-224 ◽  
Author(s):  
T.R. DITTRICH ◽  
S.W. HAAN ◽  
M.M. MARINAK ◽  
D.E. HINKEL ◽  
S.M. POLLAINE ◽  
...  
Keyword(s):  
Dopant Concentration ◽  
Three Dimensions ◽  
Initial Surface ◽  
National Ignition Facility ◽  
X Ray ◽  
Ongoing Effort ◽  
Surface Finishes ◽  
Material Homogeneity ◽  
Indirect Drive ◽  
Reduced Scale

Several choices exist in the design and production of capsules intended to ignite and propagate fusion burn of the deuterium–tritium (D–T) fuel when imploded by indirect drive at the National Ignition Facility (NIF). These choices include ablator material, ablator dopant concentration and distribution, capsule dimensions, and X-ray drive profile (shock timings and strengths). The choice of ablator material must also include fabrication and material characteristics, such as attainable surface finishes, permeability, strength, transparency to radio frequency and infrared radiation, thermal conductivity, and material homogeneity. Understanding the advantages and/or limitations of these choices is an ongoing effort for LLNL and LANL designers. At this time, simulations in one-, two-, and three-dimensions show that capsules with either a copper-doped beryllium or a polyimide (C22H10N2O4) ablator material have both the least sensitivity to initial surface roughnesses and favorable fabrication qualities. Simulations also indicate the existence of capsule designs based on these ablator materials which ignite and burn when imploded by less than nominal laser performance (900-kJ energy, 250-TW power, producing 250-eV peak radiation temperature). We will describe and compare these reduced-scale capsules, in addition to several designs which use the expected 300-eV peak X-ray drive obtained from operating the NIF laser at 1.3 MJ and 500 TW.

scholarly journals Bremsstrahlung x-ray generation for high optical depth radiography applications on the National Ignition Facility

2018 ◽  
Vol 89 (10) ◽  
pp. 10G121 ◽  
Author(s):  
C. M. Huntington ◽  
J. M. McNaney ◽  
E. Gumbrell ◽  
A. Krygier ◽  
C. Wehrenberg ◽  
...  
Keyword(s):  
Optical Depth ◽  
National Ignition Facility ◽  
X Ray

X-Ray Mapping with Energy-Dispersive and Wavelength-Dispersive X-Ray Spectrometry in the Scanning Electron Microscope: a Tutorial

1999 ◽  
Vol 5 (S2) ◽  
pp. 518-519
Author(s):  
Dale E. Newbury ◽  
David S. Bright
Keyword(s):  
Image Processing ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Recording System ◽  
X Ray ◽  
On Line ◽  
Current Electron ◽  
Sem Imaging ◽  
Display Systems ◽  
Scanning Electron

X-ray mapping is one of the most popular modes for displaying information obtained with x-ray spectrometry performed in the scanning electron microscope. This popularity arises from the ready accessibility and apparent simplicity of information presented in a pictorial fashion, especially when used in conjunction with other SEM imaging modes, such as backscattered, secondary, and specimen current electron images. Further, the rise of powerful, inexpensive computer systems capable of image processing and display has given the analyst a dedicated, on-line tool with the capacity and flexibility needed for problem solving. Figure 1 shows a typical example of mapping. Although the interpretation of x-ray images obtained with a modern digital control and recording system would seem to be straightforward and relatively trivial, there are significant pitfalls and limitations that can easily fool the unwary. In Figure 1, within an individual x-ray map, the observer can reasonably judge where the concentration is lower or higher, at least for a group of contiguous pixels. Can such judgments be made among a set of maps of the same region for different elements, or even for the same element from different regions of the same specimen? With current x-ray processing and display systems, the answers are generally no. In fact, problems that can influence interpretation can arise at each stage of x-ray generation/emission, x-ray spectral collection, processing, and display.

scholarly journals Combined neutron and x-ray imaging at the National Ignition Facility (invited)

2016 ◽  
Vol 87 (11) ◽  
pp. 11D703 ◽  
Author(s):  
C. R. Danly ◽  
K. Christensen ◽  
V. E. Fatherley ◽  
D. N. Fittinghoff ◽  
G. P. Grim ◽  
...  
Keyword(s):  
National Ignition Facility ◽  
X Ray ◽  
X Ray Imaging

scholarly journals Absolute calibration of the continuum x-ray spectrometer (ConSpec) at the National Ignition Facility

2019 ◽  
Vol 14 (12) ◽  
pp. P12009-P12009 ◽  
Author(s):  
M.J. MacDonald ◽  
B. Kozioziemski ◽  
A.G. MacPhee ◽  
M.B. Schneider ◽  
J. Ayers ◽  
...  
Keyword(s):  
Absolute Calibration ◽  
National Ignition Facility ◽  
X Ray ◽  
The Continuum

scholarly journals X-ray driven implosions at ignition relevant velocities on the National Ignition Facility

2013 ◽  
Vol 20 (5) ◽  
pp. 056311 ◽  
Author(s):  
N. B. Meezan ◽  
A. J. MacKinnon ◽  
D. G. Hicks ◽  
E. L. Dewald ◽  
R. Tommasini ◽  
...  
Keyword(s):  
National Ignition Facility ◽  
X Ray
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