N. Thompson
A5011158581- Laser-Plasma Interactions and Diagnostics
- Laser-induced spectroscopy and plasma
- Atomic and Molecular Physics
- X-ray Spectroscopy and Fluorescence Analysis
- Nuclear Physics and Applications
- High-pressure geophysics and materials
- Advanced Optical Sensing Technologies
- Astro and Planetary Science
- Nuclear physics research studies
- Combustion and Detonation Processes
- Laser Design and Applications
- Particle accelerators and beam dynamics
- Mechanical and Optical Resonators
- Quantum Chromodynamics and Particle Interactions
- Energetic Materials and Combustion
- Particle physics theoretical and experimental studies
- Ion-surface interactions and analysis
- Structural Analysis of Composite Materials
- Nuclear and radioactivity studies
- Astronomical and nuclear sciences
- Probabilistic and Robust Engineering Design
- Space Exploration and Technology
- Experimental and Theoretical Physics Studies
- Graphite, nuclear technology, radiation studies
- Radiation Detection and Scintillator Technologies
Lawrence Livermore National Laboratory
2017-2024
University of Glasgow
2007-2014
Rutherford Appleton Laboratory
1997
University of Sheffield
1933
We investigated simultaneously the 12C(e,e'p) and 12C(e,e'pp) reactions at Q2=2 (GeV/c)2, xB=1.2, in an (e, e'p) missing-momentum range from 300 to 600 MeV/c. At these kinematics, with a missing momentum greater than Fermi of nucleons nucleus far delta excitation, short-range nucleon-nucleon correlations are predicted dominate reaction. For (9.5+/-2)% events, recoiling partner proton was observed back-to-back vector, experimental signature correlations.
The interface between the capsule ablator and fuel ice layer is susceptible to hydrodynamic instabilities. subsequent mixing of hot material into reduces compression at stagnation a candidate for reduced performance. ability diagnose ice–ablator mix critical understanding improving stability this interface. Combining crystal backlighter imager with single line sight camera on National Ignition Facility (NIF) allows direct measurement by providing multiple quasi-monochromatic radiographs...
New short-pulse kilojoule, Petawatt-class lasers, which have recently come online and are coupled to large-scale, many-beam long-pulse facilities, undoubtedly serve as very exciting tools capture transformational science opportunities in high energy density physics. These lasers also happen reside a unique laser regime: high-energy (kilojoule), relatively long (multi-picosecond) pulse-lengths, large (10s of micron) focal spots, where their use driving energetic particle beams is largely...
The Crystal Backlighter Imager (CBI) is a quasi-monochromatic, near-normal incidence, spherically bent crystal imager developed for the National Ignition Facility (NIF), which will allow inertial confinement fusion capsule implosions to be radiographed close stagnation. This not possible using standard pinhole-based area-backlighter configuration, as self-emission from hotspot overwhelms backlighter signal in final stages of implosion. CBI mitigates broadband hot spot by extremely narrow...
Discrepancies exist between theoretical and experimental opacity data for iron, at temperatures 180–195 eV electron densities near 3 × 1022/cm3, relevant to the solar radiative-convective boundary. Another discrepancy, theory helioseismic measurements of boundary’s location, would be ameliorated if is correct. To address these issues, this paper details first results from new experiments under development National Ignition Facility (NIF), using a different method replicate prior conditions....
A point-projection soft X-ray Opacity Spectrometer (OpSpec) has been implemented to measure spectra from ∼1 2 keV on the National Ignition Facility (NIF). Measurement of such X-rays with open-aperture detectors is challenging because only very thin filters may be used shield detector hostile environment. OpSpec diffracts 540 2100 eV off a potassium (or rubidium) acid phthalate (KAP or RbAP) crystal onto either image plates or, most recently, films. “sacrificial front filter” strategy prevent...
During inertial confinement fusion experiments at the National Ignition Facility (NIF), a capsule filled with deuterium and tritium (DT) gas, surrounded by DT ice layer high-density carbon ablator, is driven to temperature densities required initiate fusion. In indirect method, 2 MJ of NIF laser light heats inside gold hohlraum radiation 300 eV; thermal x rays from interior couple create central hotspot tens millions degrees Kelvin density 100-200 g/cm3. interaction wall, m-band are produced...
The five-fold differential cross section for the 12C(e,e'p)11B reaction was determined over a missing momentum range of 200-400 MeV/c, in kinematics regime with Bjorken x > 1 and Q2 = 2.0 (GeV/c)2. A comparison results theoretical models previous lower data is shown. calculations agree well up to value 325 MeV/c then diverge larger momenta. extracted distorted distribution shown be consistent extends available 400 MeV/c.
High-energy-density laser facilities and advances in dynamic compression techniques have expanded access to material states the Terapascal regime relevant inertial confinement fusion, planetary science, geophysics. However, experimentally determining temperature these extreme conditions has remained a difficult challenge. Extended X-ray Absorption Fine Structure (EXAFS), referring modulations x-ray absorption above an edge from photoelectrons’ interactions with neighboring atoms, proven be...
The process of Chirped Pulse Amplification (CPA) as presently implemented on the VULCAN glass laser is capable delivering 30 J to target with pulselengths in sub- picosecond regime. Results from various experiments have shown that intensities 10<SUP>18</SUP> - 10<SUP>19</SUP> W cm<SUP>-2</SUP> been achieved enabling users carry out important new X-ray research, fusion, basic plasma physics and particle acceleration. An EPSRC (Engineering Physical Sciences Research Council) facility upgrade...
The National Ignition Facility (NIF) at Lawrence Livermore Laboratory (LLNL) uses the world’s largest and most energetic laser system to explore High-Energy-Density (HED) physics. Historically, experiments NIF could not radiograph an Inertial Confinement Fusion (ICF) experiment late times due self-emission from capsule. Crystal Backlighter Imager diagnostic (CBI) fielded on in 2017 has allowed radiography of ICF capsules times. This capability is very narrow bandwidth imaging system, which...
A description is given of an addition to the usual form recording microphotometer, which gives a record on ordinates are linearly proportional light-intensities. Results quoted show that performance instrument compares favourably with unmodified form.
The Imaging Spectroscopy Snout (ISS) used at the National Ignition Facility is able to simultaneously collect neutron pinhole images, 1D spatially resolved x-ray spectra, and time images. To measure ISS can be equipped with up four different transmission crystals, each offering energy ranges from ∼7.5 ∼12 keV resolutions. Characterizing calibrating such instruments of paramount importance in order extract meaningful results experiments. More specifically, we characterized transmission-type...