S. W. Haan
A5072559905- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Laser-Matter Interactions and Applications
- Combustion and Detonation Processes
- Nuclear Physics and Applications
- Energetic Materials and Combustion
- Atomic and Molecular Physics
- Laser Design and Applications
- Magnetic confinement fusion research
- Fusion materials and technologies
- Ion-surface interactions and analysis
- Cold Fusion and Nuclear Reactions
- Traumatic Ocular and Foreign Body Injuries
- Particle Dynamics in Fluid Flows
- Engineering and Material Science Research
- Electromagnetic Launch and Propulsion Technology
- Advanced Optical Sensing Technologies
- Nuclear Materials and Properties
- Fluid Dynamics and Turbulent Flows
- Diamond and Carbon-based Materials Research
- Radiation Detection and Scintillator Technologies
- Infrared Target Detection Methodologies
- Rocket and propulsion systems research
- High-Velocity Impact and Material Behavior
Lawrence Livermore National Laboratory
2014-2024
Los Alamos National Laboratory
2008-2021
General Atomics (United States)
2012-2021
École Polytechnique
2021
Diamond Materials (Germany)
2021
Schafer Corporation (United States)
2018
Massachusetts Institute of Technology
2012-2018
University of Rochester
2008-2017
Energetics (United States)
2008-2017
Fusion Academy
2012-2017
The 1990 National Academy of Science final report its review the Inertial Confinement Fusion Program recommended completion a series target physics objectives on 10-beam Nova laser at Lawrence Livermore Laboratory as highest-priority prerequisite for proceeding with construction an ignition-scale facility, now called Ignition Facility (NIF). These were chosen to demonstrate that there was sufficient understanding ignition targets requirements laboratory could be accurately specified. This...
The performance of a targets designed for the National Ignition Facility (NIF) are simulated in three dimensions using HYDRA multiphysics radiation hydrodynamics code. [M. Marinak et al., Phys. Plasmas 5, 1125 (1998)] In simulations cylindrical NIF hohlraum that include an imploding capsule, all relevant features and detailed laser illumination pattern, motion wall material inside shows high degree axisymmetry. Laser light is able to propagate through entrance hole required duration pulse....
Point design targets have been specified for the initial ignition campaign on National Ignition Facility [G. H. Miller, E. I. Moses, and C. R. Wuest, Opt. Eng. 443, 2841 (2004)]. The contain D-T fusion fuel in an ablator of either CH with Ge doping, or Be Cu. These shells are imploded a U Au hohlraum peak radiation temperature set between 270 300 eV. Considerations determining point include laser-plasma interactions, hydrodynamic instabilities, laser operations, target fabrication....
Abstract Obtaining a burning plasma is critical step towards self-sustaining fusion energy 1 . A one in which the reactions themselves are primary source of heating plasma, necessary to sustain and propagate burn, enabling high gain. After decades research, here we achieve burning-plasma state laboratory. These experiments were conducted at US National Ignition Facility, laser facility delivering up 1.9 megajoules pulses with peak powers 500 terawatts. We use lasers generate X-rays radiation...
The National Ignition Facility (NIF) at Lawrence Livermore Laboratory includes a precision laser system now capable of delivering 1.8 MJ 500 TW 0.35-μm light to target. NIF has been operational since March 2009. A variety experiments have completed in support NIF's mission areas: national security, fundamental science, and inertial fusion energy. capabilities infrastructure are place its missions with nearly 60 X-ray, optical, nuclear diagnostic systems. primary goal the Campaign (NIC) on...
Radiative hydrodynamics simulations of ignition experiments show that energy transfer between crossing laser beams allows tuning the implosion symmetry. A new full-scale, three-dimensional quantitative model has been developed for crossed-beam transfer, allowing calculations propagation and coupling multiple their associated plasma waves in hohlraums. This implemented a radiative-hydrodynamics code, demonstrating control symmetry by wavelength separation cones beams.
A series of cryogenic, layered deuterium-tritium (DT) implosions have produced, for the first time, fusion energy output twice peak kinetic imploding shell. These experiments at National Ignition Facility utilized high density carbon ablators with a three-shock laser pulse (1.5 MJ in 7.5 ns) to irradiate low gas-filled ($0.3\text{ }\text{ }\mathrm{mg}/\mathrm{cc}$ helium) bare depleted uranium hohlraums, resulting hohlraum radiative temperature $\ensuremath{\sim}290\text{ }\mathrm{eV}$. The...
Deuterium-tritium inertial confinement fusion implosion experiments on the National Ignition Facility have demonstrated yields ranging from 0.8 to 7×10(14), and record fuel areal densities of 0.7 1.3 g/cm2. These implosions use hohlraums irradiated with shaped laser pulses 1.5-1.9 MJ energy. The peak power duration at were varied, as capsule ablator dopant concentrations shell thicknesses. We quantify level hydrodynamic instability mix into hot spot measured elevated absolute x-ray emission...
In order to achieve the several hundred Gbar stagnation pressures necessary for inertial confinement fusion ignition, implosion experiments on National Ignition Facility (NIF) [E. I. Moses et al., Phys. Plasmas 16, 041006 (2009)] require compression of deuterium-tritium fuel layers by a convergence ratio as high forty. Such implosions are subject degradation range perturbations, including growth small-scale defects due hydrodynamic instabilities, well longer scale modulations radiation flux...
Abstract In a burning plasma state 1–7 , alpha particles from deuterium–tritium fusion reactions redeposit their energy and are the dominant source of heating. This has recently been achieved at US National Ignition Facility 8 using indirect-drive inertial-confinement fusion. Our experiments use laser-generated radiation-filled cavity (a hohlraum) to spherically implode capsules containing deuterium tritium fuel in central hot spot where occur. We have developed more efficient hohlraums...
An inertial fusion implosion on the National Ignition Facility, conducted August 8, 2021 (N210808), recently produced more than a megajoule of yield and passed Lawson's criterion for ignition [Phys. Rev. Lett. 129, 075001 (2022)]. We describe experimental improvements that enabled N210808 present first measurements from an igniting plasma in laboratory. metrics like product hot-spot energy pressure squared, absence self-heating, increased by ∼35%, leading to record values enhancement...
We present the design of first igniting fusion plasma in laboratory by Lawson's criterion that produced 1.37 MJ energy, Hybrid-E experiment N210808 (August 8, 2021) [Phys. Rev. Lett. 129, 075001 (2022)10.1103/PhysRevLett.129.075001]. This uses indirect drive inertial confinement approach to heat and compress a central "hot spot" deuterium-tritium (DT) fuel using surrounding dense DT piston. Ignition occurs when heating from absorption α particles created process overcomes loss mechanisms...
In this work we present the design of first controlled fusion laboratory experiment to reach target gain G>1 N221204 (5 December 2022) [Phys. Rev. Lett. 132, 065102 (2024)], performed at National Ignition Facility, where energy produced (3.15 MJ) exceeded amount laser required drive (2.05 MJ). Following demonstration ignition according Lawson criterion N210808, experiments were impacted by nonideal experimental fielding conditions, such as increased (known) defects that seeded hydrodynamic...
Several targets are described that in simulations give yields of 1–30 MJ when indirectly driven by 0.9–2 0.35 μm laser light. The article describes the targets, modeling was used to design them, and done set specifications for system proposed National Ignition Facility. Capsules with beryllium or polystyrene ablators enclosed gold hohlraums. All designs utilize a cryogenic fuel layer; it is very difficult achieve ignition at this scale noncryogenic capsule. It necessary use multiple bands...
It is generally recognized that a single Rayleigh-Taylor unstable mode grows exponentially, proportional to the initial amplitude, until amplitude about (1/10 (1/5 of wavelength. The growth then becomes nonlinear, and evolves into spikes bubbles. This paper considers how this picture transition nonlinearity changes when, instead there being mode, full spectrum modes. We argue nonlinear behavior begins whenever sum modes over specified small region k space comparable In case reduces usual...
For many cases of interest to inertial fusion, growth Rayleigh–Taylor and other hydrodynamic instabilities is such that the perturbations remain linear or weakly nonlinear. The transition nonlinearity studied via a second-order solution for multimode classical growth. shows how systems forget initial amplitude information in nonlinear phase. Stabilized relevant fusion qualitatively different, amplitudes are not dominated by effects. In all with full spectrum modes, effects begin when mode...
This article deals with the diffusivelike migration of electronic excitation between molecules that are randomly distributed in space. A generalized (non-Markoffian) diffusion equation is obtained, and coefficient expanded to second order molecular concentration. At early times mean squared displacement increases as 5/6th power time, instead usual first time. We conjecture that, at long times, may be described by a conventional (Markoffian) equation.
Power series in number density are used to study the distribution of cluster sizes a continuum analogue bond percolation on lattice. The clusters formed by overlapping geometrical regions that randomly distributed space. circles and oriented squares two dimensions, spheres cubes three dimensions. power based graphical expansion, using topological weights from theory probabilities obtained integrals. Analysis mean size provides estimates critical density, associated exponent.
Ignition requires precisely controlled, high convergence implosions to assemble a dense shell of deuterium-tritium (DT) fuel with ρR>∼1 g/cm2 surrounding 10 keV hot spot ρR ∼ 0.3 g/cm2. A working definition ignition has been yield ∼1 MJ. At this the α-particle energy deposited in would have ∼200 kJ, which is already ∼10 × more than kinetic typical implosion. The National Campaign includes low dudded layers study and optimize hydrodynamic assembly diagnostics rich environment. mixture...
The “High-Foot” platform manipulates the laser pulse-shape coming from National Ignition Facility to create an indirect drive 3-shock implosion that is significantly more robust against instability growth involving ablator and also modestly reduces convergence ratio. This strategy gives up on theoretical high-gain in inertial confinement fusion order obtain better control of bring experimental performance in-line with calculated performance, yet keeps absolute capsule relatively high. In...
We investigate yield degradation due to applied low mode P2 and P4 asymmetries in layered inertial confinement fusion implosions. This study has been performed with a large database of >600 2D simulations. show that radiation induced drive can result significant deviation between the core hot spot shape fuel ρR at peak compression. In addition, we residual kinetic energy compression be by these asymmetries. have developed metric, which is function shape, compression, well correlated...
Capsule performance optimization campaigns will be conducted at the National Ignition Facility [G. H. Miller, E. I. Moses, and C. R. Wuest, Nucl. Fusion 44, 228 (2004)] to substantially increase probability of ignition. The experimentally correct for residual uncertainties in implosion hohlraum physics used our radiation-hydrodynamic computational models using a variety ignition capsule surrogates before proceeding cryogenic-layered implosions experiments. quantitative goals technique...