Demonstration of Radiation Symmetry Control for Inertial Confinement Fusion in Double<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi></mml:math>-Pinch Hohlraums

Ra, Vesey; Me, Cuneo; Gr, Bennett; Jl, Porter; Rg, Adams; Ra, Aragon; Pk, Rambo; Le, Ruggles; Ww, Simpson; Smith, Ian D.

doi:10.1103/physrevlett.90.035005

Cited by 48 publications

(8 citation statements)

References 15 publications

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“…18,19 One of the limitations of imaging plate is its relatively poor spatial resolution, which is about 25-50 µm, depending upon the scanner used to read the image. Since the crystal backlighting diagnostics discussed here have reasonably large magnifications (5)(6), this limitation will be mitigated somewhat.…”

Section: Discussionmentioning

confidence: 98%

1- to 10-keV x-ray backlighting of annular wire arrays on the Sandia Z-machine using bent-crystal imaging techniques

Sinars¹,

Wenger²,

Cuneo³

et al. 2004

SPIE Proceedings

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Annular wire array implosions on the Sandia Z-machine can produce >200 TW and 1-2 MJ of soft x rays in the 0.1-10 keV range. The x-ray flux and debris in this environment present significant challenges for radiographic diagnostics. X-ray backlighting diagnostics at 1865 and 6181 eV using spherically-bent crystals have been fielded on the Z-machine, each with a ∼0.6 eV spectral bandpass, 10 µm spatial resolution, and a 4 mm by 20 mm field of view. The Z-Beamlet laser, a 2-TW, 2-kJ Nd:glass laser (λ=527 nm), is used to produce 0.1-1 J x-ray sources for radiography. The design, calibration, and performance of these diagnostics is presented.

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Section: Discussionmentioning

confidence: 98%

1- to 10-keV x-ray backlighting of annular wire arrays on the Sandia Z-machine using bent-crystal imaging techniques

Sinars¹,

Wenger²,

Cuneo³

et al. 2004

SPIE Proceedings

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“…1 From a given X ray backlighting image, one would like to extract the degree of asymmetry of the imploding shell near its peak plasma density or, equivalently, its radius of minimum X ray transmission. [3][4][5][6][7][8][9][10] Identifying that radius is the task at hand with appropriate shell thickness averaging and denoising. The main sources of the noise are thought to be the graininess of the film and the scanner digitization process.…”

Section: Figurementioning

confidence: 99%

“…The main sources of the noise are thought to be the graininess of the film and the scanner digitization process. [3][4][5][6][7][8][9][10] This suggests that the noise is additive and the empirical evidence is that it is white Gaussian. For the very symmetric shot, Z927, and the intermediate one, Z926, this is certainly the case.…”

Section: Figurementioning

confidence: 99%

Wavelets, curvelets, and multiresolution analysis techniques in fast Z-pinch research

et al. 2003

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Z pinches produce an X ray rich plasma environment where backlighting imaging of imploding targets can be quite challenging to analyze. What is required is a detailed understanding of the implosion dynamics by studying snapshot images of its in flight deformations away from a spherical shell. We have used wavelets, curvelets and multiresolution analysis techniques to address some of these difficulties and to establish the Shell Thickness Averaged Radius (STAR) of maximum density, r*(N, θ), where N is the percentage of the shell thickness over which we average. The non-uniformities of r*(N, θ) are quantified by a Legendre polynomial decomposition in angle, θ, and the identification of its largest coefficients. Undecimated wavelet decompositions outperform decimated ones in denoising and both are surpassed by the curvelet transform. In each case, hard thresholding based on noise modeling is used.

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“…Example applications include x-ray imaging and microscopy of ICF targets in z-pinch-driven hohlraums (ZPDH) [9][10][11] and dynamic hohlraums (DH) [12,13], backlighting of radiation-driven and magnetically-driven experiments, and spectroscopy. ZBL was designed to produce > 2 kJ of 2ω energy in up to four pulses of < 2 ns total duration in a 20 ns interval.…”

Section: Ii2 Z-beamlet Backlighter Diagnostic Systemmentioning

confidence: 99%

“…Possible diagnostic applications for ZBL on ZR include: (1) High-spatial-resolution PP radiography backlighting (25-50 µm resolution) or BCI radiography (5-10 µm resolution) of ICF implosion capsules in ZPDH [9][10][11] and DH [12,13] configurations. A side-on backlighting capability with the monochromatic BCI technique may be important for the DH configuration to measure polar symmetry of pellet implosions in secondary hohlraums where spherical convergence is not present.…”

Section: Ii2 Z-beamlet Backlighter Diagnostic Systemmentioning

confidence: 99%

Diagnostics development plan for ZR.

Hanson¹

2003

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The Z Refurbishment (ZR) Project is a program to upgrade the Z machine at SNL with modern durable pulsed power technology, providing additional shot capacity and improved reliability as well as advanced capabilities for both pulsed x-ray production and high pressure generation. The development of enhanced diagnostic capabilities is an essential requirement for ZR to meet critical mission needs. This report presents a comprehensive plan for diagnostic instrument and infrastructure development for the first few years of ZR operation. The focus of the plan is on: (1) developing diagnostic instruments with high spatial and temporal resolution, capable of low noise operation and survival in the severe EMP, bremsstrahlung, and blast environments of ZR; and (2) providing diagnostic infrastructure improvements, including reduced diagnostic trigger signal jitter, more and flexible diagnostic line-of-sight access, and the capability for efficient exchange of diagnostics with other laboratories. This diagnostic plan is the first step in an extended process to provide enhanced diagnostic capabilities for ZR to meet the diverse programmatic needs of a broad range of defense, energy, and general science programs of an international user community into the next decade. ZR Diagnostics Development Plan ________________________________________________________________________ 4 AcknowledgementsThe author would like to thank

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Demonstration of Radiation Symmetry Control for Inertial Confinement Fusion in DoubleZ-Pinch Hohlraums

Cited by 48 publications

References 15 publications

1- to 10-keV x-ray backlighting of annular wire arrays on the Sandia Z-machine using bent-crystal imaging techniques

1- to 10-keV x-ray backlighting of annular wire arrays on the Sandia Z-machine using bent-crystal imaging techniques

Wavelets, curvelets, and multiresolution analysis techniques in fast Z-pinch research

Diagnostics development plan for ZR.

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