A5052239753- Fusion materials and technologies
- Magnetic confinement fusion research
- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Nuclear Materials and Properties
- Nuclear reactor physics and engineering
- Superconducting Materials and Applications
- Atomic and Molecular Physics
- Laser Design and Applications
- Nuclear Physics and Applications
- Laser Material Processing Techniques
- Analytical chemistry methods development
- Advanced ceramic materials synthesis
- Ion-surface interactions and analysis
- Particle accelerators and beam dynamics
- Solid State Laser Technologies
- High-pressure geophysics and materials
- Metallurgical Processes and Thermodynamics
- Nuclear and radioactivity studies
- Advanced Optical Sensing Technologies
- Plasma Diagnostics and Applications
- Laser-Matter Interactions and Applications
- Optical Systems and Laser Technology
- Graphite, nuclear technology, radiation studies
- X-ray Spectroscopy and Fluorescence Analysis
General Atomics (United States)
2022
University of California, San Diego
2011-2021
Lawrence Livermore National Laboratory
1999-2013
Molina Center for Energy and the Environment
2009
University of California System
2002-2007
University of California, Los Angeles
1988-2003
Fusion (United States)
1994-2003
Fusion Academy
1994-2003
Rensselaer Polytechnic Institute
1997-2003
Los Alamos National Laboratory
1999
The effect of ambient gas on the expansion dynamics plasma generated by laser ablation an aluminum target has been investigated using frequency doubled radiation from a Q-switched Nd:YAG laser. diagnostic tools include fast photography overall visible plume emission 2 ns gated intensified charged coupled device and space time resolved spectroscopy 50 cm monochromator/spectrograph photomultiplier tube. behavior was studied with air pressure ranging 10−6 to 100 Torr. Free expansion, splitting...
Intermittent plasma objects (IPOs) featuring higher pressure than the surrounding plasma, and responsible for ∼50% of E×BT radial transport, are observed in scrape off layer (SOL) edge DIII-D tokamak [J. Watkins et al., Rev. Sci. Instrum. 63, 4728 (1992)]. Conditional averaging reveals that IPOs, produced at a rate ∼3×103 s−1, positively charged also polarized, poloidal electric fields up to 4000 V/m. The IPOs move poloidally speeds 5000 m/s radially with E×BT/B2 velocities ∼2600 near last...
The dynamics and confinement of laser-created plumes expanding across a transverse magnetic field have been investigated. 1.06 microm, 8 ns pulses from neodymium-doped yttrium aluminum garnet laser were used to create an plasma which was allowed expand 0.64 T field. Fast photography, emission spectroscopy, time flight spectroscopy as diagnostic tools. Changes in plume structure dynamics, enhanced ionization, velocity enhancement observed the presence Photographic studies showed that is not...
Optical emission spectroscopic studies have been carried out on a tin plasma generated using 1064-nm, 8-ns pulses from Nd:yttrium aluminum garnet laser. Temperature and density were estimated the analysis of spectral data. The temperature measurements performed by Boltzmann diagram method singly ionized Sn lines, while made Stark broadening method. An initial 3.2 eV 7.7×1017cm−3 measured. Temporal spatial behaviors electron in laser-generated analyzed. Time evolutions are found to decay...
Plume splitting and sharpening were observed in laser-produced aluminium plasma created using 532 nm, 8 ns pulses from a frequency doubled Nd : YAG laser. Measurements made 2 gated fast photography as well space time resolved optical emission spectroscopy. The motion of the leading edge plume was studied with several background air pressures expansion front compared various models. Combining imaging together diagnostics, triple structure observed.
Ablation plumes caused by short-pulse laser irradiation provide conditions which are well suited to the formation of nanoclusters. The high saturation ratios and presence ionization lead extraordinarily nucleation rates small critical radii. We have explored homogeneous heterogeneous growth condensates from Si targets expanding into a low-pressure He ambient using Nd:YAG with pulse length 8 ns, wavelength 532 nm intensities in range 5 × 107–5 109 W cm−2. Clusters 5–50 been produced. In...
Controlling the debris from a laser-generated tin plume is one of prime issues in development an extreme ultraviolet lithographic light source. An ambient gas that transparent to 13.5nm radiation can be used for controlling highly energetic particles plume. We employed partial argon pressure decelerating various species The kinetic energy distributions were analyzed at short and large distances using time space resolved optical emission spectroscopy Faraday cup, respectively. A fast-gated...
AbstractLiquid metal breeders such as Lithium or the eutectic Lead-Lithium alloy PbLi have potential for attractive breeding blankets, especially if liquid serves breeder and coolant. However, cooling of first wall blanket structure is a challenging task because magnetic field degrades heat transfer can cause really high pressure drop. To overcome these problems, dual coolant blankets with helium cooled FW/blanket self-cooled zone had been proposed, electrical insulation by ceramic-coatings...
The proposed Fusion Nuclear Science Facility (FNSF) represents the first facility to enter complex fusion nuclear regime, and its technical mission attributes are being developed. FNSF one part of energy development pathway commercial power plant with other major components pre-FNSF research development, in parallel FNSF, pre-DEMO demonstration (DEMO). Energy Systems Studies group is developing basis for order provide a better understanding demands on plasma science programs.
Tokamak power plants are studied with advanced and conservative design philosophies to identify the impacts on resulting designs provide guidance critical research needs. Incorporating updated physics understanding using more sophisticated engineering analysis, tokamak configurations have developed a credible basis compared older studies. The configuration assumes self-cooled lead lithium blanket concept SiC composite structural material 58% thermal conversion efficiency. This plasma has...
A coordinated, focused effort is underway to develop Laser Inertial Fusion Energy. The key components are developed in concert with one another and the science engineering issues addressed concurrently. Recent advances include: target designs have been evaluated that show it could be possible achieve high gains (>100) needed for a practical fusion system.These feature low-density CH foam wicked solid DT over-coated thin high-Z layer. These results verified three independent one-dimensional...
The laser propagation and energy absorption of an argon spark induced by a at different pressures is investigated. 8 ns pulses from frequency-doubled Q-switched Nd:YAG are used to create the spark. pressure varied 1 atm 10 Torr. Significant plasma observed high (>100 Torr) while there negligible when lower than 50 kernel showed distinct behavior with respect energy. At well above breakdown threshold, moved only in backward direction forward component was absent indicating strong...
The energy absorption and laser propagation characteristics of air argon sparks at one atmosphere have been investigated. To create the sparks, 532 nm pulses from a frequency doubled Q-switched Nd:YAG are used. We employed 2 ns gated fast photography for studying time evolution kernel early times. Optical emission spectroscopy is used to infer temperature density sparks. Significant by plasma observed just above breakdown threshold. in spark indicated that more absorptive than plasma....
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...
The effects of laser wavelength on the charge state resolved ion energy distributions from laser-produced Sn plasma freely expanding into vacuum are investigated. Planar targets irradiated at wavelengths 10.6 and 1.064 μm intensities 1.8×1010 3.4×1011 W/cm2, respectively. These parameters relevant to extreme ultraviolet x-ray source application. An electrostatic deflection probe single channel electron multiplier used record 100 cm source. At longer wavelength, higher ions observed. both...
Liquid metal (LM) plasma-facing components (PFCs) may provide a resolution to the challenging fusion environment, particularly first wall and divertor surfaces. Transforming these concepts into viable technologies will require considerable research development. With nuclear regime in mind, Fusion Energy System Studies group examined LM PFCs order identify needed thrusts that could accelerate their development assess viability. behavior, solid substrate aspects, facility integration aspects...