An initial assessment of three-dimensional polar direct drive capsule asymmetries for implosions at the National Ignition Facility

2012 ◽  
Vol 19 (1) ◽  
pp. 012702 ◽  
Author(s):  
Natalia S. Krasheninnikova ◽  
Sean M. Finnegan ◽  
Mark J. Schmitt
Keyword(s):  
Three Dimensional ◽  
Initial Assessment ◽  
Direct Drive ◽  
National Ignition Facility

Three dimensional low-mode areal-density non-uniformities in indirect-drive implosions at the National Ignition Facility

2021 ◽  
Vol 28 (4) ◽  
pp. 042708
Author(s):  
D. T. Casey ◽  
O. L. Landen ◽  
E. Hartouni ◽  
R. M. Bionta ◽  
K. D. Hahn ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Areal Density ◽  
National Ignition Facility ◽  
Indirect Drive

scholarly journals Transient Three-Dimensional Flow Field Measurements by Means of 3D µPTV in Drying Poly(Vinyl Acetate)-Methanol Thin Films Subject to Short-Scale Marangoni Instabilities

Polymers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1223
Author(s):  
Max Tönsmann ◽  
Philip Scharfer ◽  
Wilhelm Schabel
Keyword(s):  
Flow Field ◽  
Vinyl Acetate ◽  
Three Dimensional ◽  
Field Measurements ◽  
Initial Assessment ◽  
Ambient Conditions ◽  
Three Dimensional Flow ◽  
Dimensional Flow ◽  
Short Scale ◽  
Dry Film

Convective Marangoni instabilities in drying polymer films may induce surface deformations, which persist in the dry film, deteriorating product performance. While theoretic stability analyses are abundantly available, experimental data are scarce. We report transient three-dimensional flow field measurements in thin poly(vinyl acetate)-methanol films, drying under ambient conditions with several films exhibiting short-scale Marangoni convection cells. An initial assessment of the upper limit of thermal and solutal Marangoni numbers reveals that the solutal effect is likely to be the dominant cause for the observed instabilities.

scholarly journals Evidence of Three-Dimensional Asymmetries Seeded by High-Density Carbon-Ablator Nonuniformity in Experiments at the National Ignition Facility

2021 ◽  
Vol 126 (2) ◽  
Author(s):  
D. T. Casey ◽  
B. J. MacGowan ◽  
J. D. Sater ◽  
A. B. Zylstra ◽  
O. L. Landen ◽  
...  
Keyword(s):  
Three Dimensional ◽  
High Density ◽  
National Ignition Facility

scholarly journals The National Direct-Drive Program: OMEGA to the National Ignition Facility

2017 ◽  
Vol 73 (2) ◽  
pp. 89-97 ◽  
Author(s):  
S. P. Regan ◽  
V. N. Goncharov ◽  
T. C. Sangster ◽  
E. M. Campbell ◽  
R. Betti ◽  
...  
Keyword(s):  
Direct Drive ◽  
National Ignition Facility

scholarly journals Long-duration direct drive hydrodynamics experiments on the National Ignition Facility: Platform development and numerical modeling with CHIC

2019 ◽  
Vol 26 (8) ◽  
pp. 082703 ◽  
Author(s):  
C. Mailliet ◽  
E. Le Bel ◽  
L. Ceurvorst ◽  
S. F. Khan ◽  
D. Martinez ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Direct Drive ◽  
National Ignition Facility ◽  
Long Duration ◽  
Platform Development

scholarly journals Direct-drive implosion physics: Results from OMEGA and the National Ignition Facility

2016 ◽  
Vol 688 ◽  
pp. 012006 ◽  
Author(s):  
P. B. Radha ◽  
V. N. Goncharov ◽  
M. Hohenberger ◽  
T. C. Sangster ◽  
R. Betti ◽  
...  
Keyword(s):  
Direct Drive ◽  
National Ignition Facility

Direct-drive implosion physics: Results from OMEGA and the National Ignition Facility

2016 ◽  
pp. 457-462
Author(s):  
P. B. Radha ◽  
V. N. Goncharov ◽  
M. Hohenberger ◽  
T. C. Sangster ◽  
R. Betti ◽  
...  
Keyword(s):  
Direct Drive ◽  
National Ignition Facility

Additively Manufactured Continuous Fibre-Reinforced Thermoplastics for Mechanisms Subjected to Predominant Inertial Load: A Case Study

2020 ◽  
Author(s):  
Luca Luzi ◽  
Giacomo Quercioli ◽  
Riccardo Pucci ◽  
Guido Bocchieri ◽  
Rocco Vertechy ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Topology Optimization ◽  
High Performance ◽  
Permanent Magnet Synchronous Motor ◽  
Three Dimensional ◽  
Direct Drive ◽  
Continuous Fibre ◽  
Mechanical Components ◽  
Reinforced Thermoplastics

Abstract In the last decade, the adoption of additive manufacturing technologies (AMT) (3D printing) has increased significantly in many fields of engineering, initially only for rapid prototyping and more recently also for the production of finished parts. With respect to the long-established material subtractive technologies (MST), AMT is capable to overcome several limitations related to the shape realization of high-performance mechanical components such as those conceived via topology optimization and generative design approaches. In the field of structures and mechanisms, a major advantage of AMT over MST is that, for the same loading and constraining conditions (including kinematic and overall encumbrance), it enables the realization of mechanical components with similar stiffness but smaller volume (thus smaller weight, density being equal). Recently, the potentialities of AMT have also been increased by the introduction of the fuse filament deposition modeling (FDM) of continuous fibre-reinforced thermoplastics (CFRT), which combines the ease of processing of plastic AMT with the strength and specific modulus of the printed components that are comparable to those attainable via metallic AMT. In this context, the present paper investigates the potentialities of FDM-CFRT for the realization of mechanisms subjected to predominant inertial loads such as those found in automated packaging machinery. As a case study a Stephenson six-bar linkage powered in direct drive by a permanent magnet synchronous motor is considered. Starting from an existing mechanism realized in aluminum alloy with traditional MST, a newer version to be realized with FDM-CFRT has been conceived by keeping the kinematics fixed and by redesigning the links via three-dimensional topology optimization. To provide a fair comparison with the more traditional design/manufacturing approach, size optimization of the original mechanism made in aluminum alloy has also been performed. Comparison of the two versions of the mechanism highlights the superior performances of the one manufactured via FDM-CFRT in terms of weight, motor torque requirements and motion precision.

scholarly journals Stimulated Raman scattering mechanisms and scaling behavior in planar direct-drive experiments at the National Ignition Facility

2020 ◽  
Vol 27 (4) ◽  
pp. 042705 ◽  
Author(s):  
M. J. Rosenberg ◽  
A. A. Solodov ◽  
W. Seka ◽  
R. K. Follett ◽  
J. F. Myatt ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Stimulated Raman Scattering ◽  
Scaling Behavior ◽  
Direct Drive ◽  
National Ignition Facility ◽  
Scattering Mechanisms ◽  
Stimulated Raman

Polar direct drive: Proof-of-principle experiments on OMEGA and prospects for ignition on the National Ignition Facility

2005 ◽  
Vol 12 (5) ◽  
pp. 056304 ◽  
Author(s):  
R. S. Craxton ◽  
F. J. Marshall ◽  
M. J. Bonino ◽  
R. Epstein ◽  
P. W. McKenty ◽  
...  
Keyword(s):  
Direct Drive ◽  
National Ignition Facility ◽  
Proof Of Principle
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