D. R. Harding
A5076323043- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Laser-Matter Interactions and Applications
- Laser Design and Applications
- Nuclear Physics and Applications
- Fusion materials and technologies
- Advanced Drug Delivery Systems
- Synthesis and properties of polymers
- Combustion and Detonation Processes
- Hydrogels: synthesis, properties, applications
- Diamond and Carbon-based Materials Research
- Spacecraft and Cryogenic Technologies
- Superconducting Materials and Applications
- Spectroscopy and Laser Applications
- Metal and Thin Film Mechanics
- Gamma-ray bursts and supernovae
- Astro and Planetary Science
- Atomic and Molecular Physics
- Tribology and Wear Analysis
- Semiconductor materials and devices
- Nanocomposite Films for Food Packaging
- Electrohydrodynamics and Fluid Dynamics
- Chemical Synthesis and Analysis
- Advanced Chemical Physics Studies
Energetics (United States)
2014-2024
University of Rochester
2014-2024
Applied Energetics (United States)
1997-2024
Massey University
2008-2023
Evonik (Germany)
2020-2023
National Cheng Kung University
2017-2018
Sandia National Laboratories
2017-2018
General Atomics (United States)
2018
Lawrence Livermore National Laboratory
2018
Hamamatsu Photonics (Japan)
2018
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...
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...
Reaching ignition in direct-drive (DD) inertial confinement fusion implosions requires achieving central pressures excess of 100 Gbar. The OMEGA laser system [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)] is used to study the physics that are hydrodynamically equivalent designs on National Ignition Facility (NIF) [J. A. Paisner Laser Focus World 30, 75 (1994)]. It shown highest hot-spot (up 40 Gbar) achieved target with a fuel adiabat α ≃ 4, an implosion velocity 3.8 × 107 cm/s, and...
The utilization of Fe<sub>3</sub>O<sub>4</sub>-boosted MWCNT in PET glycolysis is considered a successful attempt to achieve an efficient procedure.
Three recent developments in direct-drive target design have enhanced the possibility of achieving high gain on National Ignition Facility (NIF): (1) Laser absorption was increased by almost 50% using wetted-foam targets. (2) Adiabat shaping significantly hydrodynamic stability during acceleration phase implosion without sacrificing gain. (3) Techniques to reduce laser imprint pulse and radiation preheat were developed. These features can be employed for direct-drive-ignition experiments...
Significant progress in direct-drive inertial confinement fusion (ICF) research has been made since the completion of 60-beam, 30-kJUV OMEGA Laser System [Boehly, Opt. Commun. 133, 495 (1997)] 1995. A theory ignition requirements, applicable to any ICF concept, developed. Detailed understanding laser-plasma coupling, electron thermal transport, and hot-electron preheating lead measurement neutron-averaged areal densities ∼200mg∕cm2 cryogenic target implosions. These correspond an estimated...
Polar drive [Skupsky et al., Phys. Plasmas 11, 2763 (2004)] will enable direct-drive experiments to be conducted on the National Ignition Facility (NIF) [Miller Opt. Eng. 43, 2841 (2004)], while facility is configured for x-ray drive. A polar-drive ignition design NIF has been developed that achieves a gain of 32 in two-dimensional (2-D) simulations, which include single- and multiple-beam nonuniformities ice outer-surface roughness. This requires both single-beam UV polarization smoothing...
Laser-induced fluorescence (LIF) spectra of the A–X system LiH isotopes, excited by UV lines an argon and a krypton ion laser, were observed analyzed. Three long LIF series different isotopes taken with 3.4 m high resolution spectrograph. The results combined previous experimental data to study breakdown Born–Oppenheimer approximation in X 1Σ+ electronic ground state isotopic molecules. Using quantum mechanical variational method, potential energy curves four extended almost up dissociation limits.
To support direct-drive inertial confinement fusion experiments at the National Ignition Facility (NIF) [G. H. Miller, E. I. Moses, and C. R. Wuest, Opt. Eng. 43, 2841 (2004)] in its indirect-drive beam configuration, polar-direct-drive (PDD) concept [S. Skupsky et al., Phys. Plasmas 11, 2763 has been proposed. PDD geometry requires direct-drive–specific smoothing, phase plates, repointing NIF beams toward equator to ensure symmetric target irradiation. First study energetics preheat...
A major advantage of the laser direct-drive (DD) approach to ignition is increased fraction drive energy coupled hot spot and relaxed hot-spot requirements for peak pressure convergence ratios relative indirect-drive at equivalent energy. With goal a successful demonstration using DD, recently established national strategy has several elements involves multiple international institutions. These include experimental on OMEGA cryogenic implosions conditions relevant MJ-scale energies available...
Chemical modifications of chitosan were interest to scientific researchers for its wide applications. Chitosan has been widely used synthesis unique compounds with potential biological activity and also effective wastewater treatment. In the current study fabrication new chitosan-based Schiff base hydrogels fabricated through modification isonicotinic aldehyde give hydrogel I or epichlorohydrin sodium tripolyphosphate via ionotropic gelation processes under same reaction conditions Ie,...
We are carrying out a multidisciplinary multi-institutional program to develop the scientific and technical basis for inertial fusion energy (IFE) based on laser drivers direct-drive targets. The key components developed as an integrated system, linking science, technology, final application of 1000-MWe pure-fusion power plant. science technologies here flexible enough be applied other size systems. justification this work is family target designs (simulations) that show direct drive has...
A flexible direct-drive target platform is used to implode cryogenic deuterium–tritium (DT) capsules on the OMEGA laser [Boehly et al., Opt. Commun. 133, 495 (1997)]. The goal of these experiments demonstrate ignition hydrodynamically equivalent performance where drive intensity, implosion velocity, fuel adiabat, and in-flight aspect ratio (IFAR) are same as those for a 1.5-MJ [Goncharov Phys. Rev. Lett. 104, 165001 (2010)] designed ignite National Ignition Facility [Hogan Nucl. Fusion 41,...
Spherically symmetric, low-adiabat (adiabat α ≲ 3) cryogenic direct-drive-implosion experiments on the OMEGA laser [T. R. Boehly et al., Opt. Commun. 133, 495 (1995)] yield less than 10% of neutrons predicted in one-dimensional hydrodynamic simulations. Two-dimensional simulations suggest that this performance degradation can be explained assuming perturbations from isolated defects submicron to tens-of-micron scale outer surface or inside shell implosion targets. These develop during...
Magneto-inertial fusion (MIF) combines the compression of fuel, a hallmark inertial confinement (ICF), with strongly magnetized plasmas that suppress electron heat losses, magnetic fusion. It can reduce traditional velocity, pressure, and convergence ratio requirements ICF. The liner (MagLIF) concept being studied at Z Pulsed-Power Facility is key target in U.S. ICF Program. Laser-driven MagLIF developed on OMEGA to test scaling over range absorbed energy order 1 kJ 500 Z. also valuable as...
A 1.8-million-member D-octapeptide combinatorial library was constructed in which each member comprised a diversity-containing N-terminal pentapeptide and C-terminal amidated triarginine motif. The motif concentrated the members at fungal cell surface. primary screen for inhibitors of Saccharomyces cerevisiae Candida albicans growth, together with an vitro secondary S. plasma membrane ATPase (Pma1p) as target, identified antifungal BM0 (D-NH(2)-RFWWFRRR-CONH(2)). Optimization led to...