Effects of non-local electron transport in one-dimensional and two-dimensional simulations of shock-ignited inertial confinement fusion targets

2014 ◽  
Vol 21 (1) ◽  
pp. 012701 ◽  
Author(s):  
A. Marocchino ◽  
S. Atzeni ◽  
A. Schiavi
Keyword(s):  
Electron Transport ◽  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
Two Dimensional ◽  
Local Electron ◽  
One Dimensional ◽  
Confinement Fusion ◽  
Non Local

scholarly journals Irradiation symmetry of heavy ion driven inertial confinement fusion (ICF) targets

1983 ◽  
Vol 1 (4) ◽  
pp. 335-345 ◽  
Author(s):  
G. Buchwald ◽  
G. Graebner ◽  
J. Theis ◽  
J. A. Maruhn ◽  
H. Stöcker ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Heavy Ion ◽  
Present Form ◽  
Inertial Confinement ◽  
Two Dimensional ◽  
Beam Angle ◽  
Beam Geometry ◽  
Confinement Fusion ◽  
Hydrodynamic Code

The symmetry of heavy ion driven inertial confinement fusion targets is investigated with a two-dimensional Eulerian hydrodynamic code. The importance of the beam geometry is studied. The HIBALL design in its present form seems to inhibit a spherical implosion of the target. It is shown that the beam angle in the HIBALL geometry should be about 35 degrees.

scholarly journals Numerical simulation of mixing by Rayleigh–Taylor and Richtmyer–Meshkov instabilities

1994 ◽  
Vol 12 (4) ◽  
pp. 725-750 ◽  
Author(s):  
D.L. Youngs
Keyword(s):  
Numerical Simulation ◽  
Turbulence Model ◽  
Turbulent Mixing ◽  
Inertial Confinement Fusion ◽  
Three Dimensional ◽  
Small Scale ◽  
Inertial Confinement ◽  
Two Dimensional ◽  
Confinement Fusion ◽  
Icf Target

Rayleigh-Taylor (RT) and Richtmyer–Meshkov (RM) instabilities at the pusher–fuel interface in inertial confinement fusion (ICF) targets may significantly degrade thermonuclear burn. Present-day supercomputers may be used to understand the fundamental instability mechanisms and to model the effect of the ensuing mixing on the performance of the ICF target. Direct three-dimensional numerical simulation is used to investigate turbulent mixing due to RT and RM instability in simple situations. A two-dimensional turbulence model is used to assess the effect of small-scale turbulent mixing in the axisymmetric implosion of an idealized ICF target.

scholarly journals Developing one-dimensional implosions for inertial confinement fusion science

2016 ◽  
Vol 4 ◽  
Author(s):  
J. L. Kline ◽  
S. A. Yi ◽  
A. N. Simakov ◽  
R. E. Olson ◽  
D. C. Wilson ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Liquid Fuel ◽  
Hot Spot ◽  
High Gain ◽  
Limiting Factors ◽  
Inertial Confinement ◽  
Trade Off ◽  
One Dimensional ◽  
Confinement Fusion ◽  
Fusion Implosions

Experiments on the National Ignition Facility show that multi-dimensional effects currently dominate the implosion performance. Low mode implosion symmetry and hydrodynamic instabilities seeded by capsule mounting features appear to be two key limiting factors for implosion performance. One reason these factors have a large impact on the performance of inertial confinement fusion implosions is the high convergence required to achieve high fusion gains. To tackle these problems, a predictable implosion platform is needed meaning experiments must trade-off high gain for performance. LANL has adopted three main approaches to develop a one-dimensional (1D) implosion platform where 1D means measured yield over the 1D clean calculation. A high adiabat, low convergence platform is being developed using beryllium capsules enabling larger case-to-capsule ratios to improve symmetry. The second approach is liquid fuel layers using wetted foam targets. With liquid fuel layers, the implosion convergence can be controlled via the initial vapor pressure set by the target fielding temperature. The last method is double shell targets. For double shells, the smaller inner shell houses the DT fuel and the convergence of this cavity is relatively small compared to hot spot ignition. However, double shell targets have a different set of trade-off versus advantages. Details for each of these approaches are described.

scholarly journals The k-L turbulence model for describing buoyancy-driven fluid instabilities

2006 ◽  
Vol 24 (3) ◽  
pp. 381-394 ◽  
Author(s):  
VINCENT P. CHIRAVALLE
Keyword(s):  
Turbulence Model ◽  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
Turbulent Eddy ◽  
One Dimensional ◽  
Fluid Instabilities ◽  
Confinement Fusion ◽  
Free Parameters ◽  
Atwood Number ◽  
Scale Length

The k-L turbulence model, where k is the turbulent kinetic energy and L represents the turbulent eddy scale length, is a two-equation turbulence model that has been proposed to simulate turbulence induced by Rayleigh-Taylor (RT) and Richtmyer Meshkov (RM) instabilities, which play an important role in the implosions of inertial confinement fusion (ICF) capsule targets. There are three free parameters in the k-L model, and in this paper, I calibrate them independently by comparing with RT and RM data from the linear electric motor (LEM) experiments together with classical Kelvin-Helmoholtz (KH) data. To perform this calibration, I numerically solved the equations of one-dimensional (1D) Lagrangian hydrodynamics, in a manner similar to that of contemporary ICF codes, together with the k-L turbulence model. With the three free parameters determined, I show that the k-L model is successful in describing both shear-driven and buoyancy-driven instabilities, capturing the experimentally observed separation between bubbles and spikes at high Atwood number for the RT case, as well as the temporal mix width recorded in RM shock tube experiments.

scholarly journals Improved surrogates in inertial confinement fusion with manifold and cycle consistencies

2020 ◽  
Vol 117 (18) ◽  
pp. 9741-9746 ◽  
Author(s):  
Rushil Anirudh ◽  
Jayaraman J. Thiagarajan ◽  
Peer-Timo Bremer ◽  
Brian K. Spears
Keyword(s):  
Inertial Confinement Fusion ◽  
Predictive Performance ◽  
Data Driven ◽  
Inertial Confinement ◽  
Test Bed ◽  
One Dimensional ◽  
Sampling Artifacts ◽  
Inverse Results ◽  
Confinement Fusion ◽  
Numerical Simulator

Neural networks have become the method of choice in surrogate modeling because of their ability to characterize arbitrary, high-dimensional functions in a data-driven fashion. This paper advocates for the training of surrogates that are 1) consistent with the physical manifold, resulting in physically meaningful predictions, and 2) cyclically consistent with a jointly trained inverse model; i.e., backmapping predictions through the inverse results in the original input parameters. We find that these two consistencies lead to surrogates that are superior in terms of predictive performance, are more resilient to sampling artifacts, and tend to be more data efficient. Using inertial confinement fusion (ICF) as a test-bed problem, we model a one-dimensional semianalytic numerical simulator and demonstrate the effectiveness of our approach.

Fully kinetic simulation of coupled plasma and neutral particles in scrape-off layer plasmas of fusion devices

1999 ◽  
Vol 61 (2) ◽  
pp. 347-364 ◽  
Author(s):  
O. V. BATISHCHEV ◽  
M. M. SHOUCRI ◽  
A. A. BATISHCHEVA ◽  
I. P. SHKAROFSKY
Keyword(s):  
Inertial Confinement Fusion ◽  
Inertial Confinement ◽  
Local Effects ◽  
Particle In Cell ◽  
Neutral Particles ◽  
Transient Regimes ◽  
Confinement Fusion ◽  
Non Local ◽  
Collisional Regime ◽  
Statistical Noise

Fluid descriptions of plasmas, which are usually applied to a collisional plasma, can only be justified for very small Coulomb Knudsen numbers. However, the scrape-off layer (SOL) plasmas of experimental magnetic confinement fusion devices tend to have operational regimes characterized by a Coulomb Knudsen number around 0.1. In interesting detached regimes of an SOL plasma in a tokamak, when the plasma detaches from the limiters or divertors, this number may increase along with the local plasma gradients. Plasma gradients are also known to increase (and thus drive non-local effects) in inertial confinement fusion. Neutrals, which are being produced owing to plasma recombination at the plasma–divertor interface, may be in a mixed collisional regime as well. Thus simultaneous kinetic treatments of plasma and neutral particles with self-consistent evaluation of boundary conditions at the material walls are required. We present a physical model and a numerical scheme, and discuss results of purely kinetic simulations of plasmas and neutrals for actual conditions in the Alcator C-Mod and Tokamak-de-Varennes experimental tokamaks. Results for both steady-state and transient regimes of SOL plasma flow are presented. Our approach, unlike particle-in-cell and Monte Carlo methods, is free from statistical noise.

Sign in / Sign up

Export Citation Format

Share Document