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On Point Designs for High Gain Fast Ignition

Description: Fast ignition research has reached the stage where point designs are becoming crucial to the identification of key issues and the development of projects to demonstrate high gain fast ignition. The status of point designs for cone coupled electron fast ignition and some of the issues they highlight are discussed.
Date: September 27, 2007
Creator: Key, M.; Akli, K.; Beg, F.; Betti, R.; Clark, D. S.; Chen, S. N. et al.
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Partner: UNT Libraries Government Documents Department
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Nail-like targets for laser plasma interaction experiments

Description: The interaction of ultra-high power picosecond laser pulses with solid targets is of interest both for benchmarking the results of hybrid particle in cell (PIC) codes and also for applications to re-entrant cone guided fast ignition. We describe the construction of novel targets in which copper/titanium wires are formed into 'nail-like' objects by a process of melting and micromachining, so that energy can be reliably coupled to a 24 {micro}m diameter wire. An extreme-ultraviolet image of the i… more
Date: December 18, 2007
Creator: Pasley, J.; Wei, M.; Shipton, E.; Chen, S.; Ma, T.; Beg, F. N. et al.
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Partner: UNT Libraries Government Documents Department
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Integrated Laser-Target Interaction Experiments on the RAL Petawatt Laser

Description: Since the construction of the first Petawatt laser on the Nova laser facility at Lawrence Livermore National Laboratory we are witnessing the emergence of similar Petawatt-class laser systems at laboratories all around the world. This new generation of lasers, able to deliver several hundred joules of energy in a sub-picosecond pulse, has enabled a host of new discoveries to be made and continues to provide a valuable tool to explore new regimes in relativistic laser-plasma physics--encompassin… more
Date: October 11, 2006
Creator: Patel, P. K.; Key, M. H.; Mackinnon, A. J.; Berry, R.; Borghesi, M.; Chambers, D. M. et al.
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Partner: UNT Libraries Government Documents Department
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Studies of electron and proton isochoric heating for fast ignition

Description: Isochoric heating of inertially confined fusion plasmas by laser driven MeV electrons or protons is an area of great topical interest in the inertial confinement fusion community, particularly with respect to the fast ignition (FI) proposal to use this technique to initiate burn in a fusion capsule. Experiments designed to investigate electron isochoric heating have measured heating in two limiting cases of interest to fast ignition, small planar foils and hollow cones. Data from Cu K{alpha} fl… more
Date: October 2, 2006
Creator: Mackinnon, A.; Key, M.; Akli, K.; Beg, F.; Clarke, R.; Clarke, D. et al.
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Partner: UNT Libraries Government Documents Department
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LDRD ER Final Report: Recreating Planetary Cores in the Laboratory: New Techniques to Extremely High Density States

Description: An accurate equation of state (EOS) for planetary constituents at extreme conditions is the key to any credible model of planets or low mass stars. However, very few materials have their high pressure (>few Mbar) EOS experimentally validated, and even then, only on the principal Hugoniot. For planetary and stellar interiors, compression occurs from gravitational force so that material states follow a line of isotropic compression (ignoring phase separation) to ultra-high densities. An exampl… more
Date: February 7, 2003
Creator: Collins, G.; Celliers, P.; Hicks, D.; Cauble, R.; Bradley, D.; MacKinnon, A. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Design for Laser Produced Shocks in Diamond Anvil Cells

Description: Laser driven shock measurements have been performed on pre-compressed samples. A diamond anvil cell (DAC) has been used to statically compress water to 1 GPa and then strong shocked with an energetic laser. The use of intense laser irradiation can drive shocks in targets making it possible to study the equation of state (EOS) of samples well into the hundreds of GPQ regime. Generally, such experiments employ a sample initially at normal density and standard pressure. Therefore providing data on… more
Date: June 22, 2001
Creator: Moon, S. J.; Cauble, R.; Collins, G. W.; Celliers, P. M.; Hicks, D.; Da Silva, L. B. et al.
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Partner: UNT Libraries Government Documents Department
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Overview of recent progress in US fast ignition research

Description: The Fast Ignition Program in the United States has enjoyed increased funding in various forms from the Office of Fusion Energy Sciences of the Department of Energy. The program encompasses experiments on large laser facilities at various world-wide locations, and benefits enormously from collaborations with many international scientists. The program includes exploratory work in cone-target design and implosion dynamics, high electron current transport measurements in normal density materials, d… more
Date: September 28, 2005
Creator: Freeman, R. R.; Akli, K.; Beg, F.; Betti, R.; Chen, S.; Clark, D. J. et al.
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Partner: UNT Libraries Government Documents Department
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K-(alpha) Radiography at 20-100 keV Using Short-Pulse Lasers

Description: X-ray radiography is an important tool for diagnosing and imaging planar and convergent hydrodynamics phenomena for laser experiments. Until now, hydrodynamics experiments at Omega and NIF utilize E{sub x-ray} < 9 keV backlighter x-rays emitted by thermal plasmas. However, future experiments will need to diagnose larger and denser targets and will require x-ray probes of energies from 20-100 keV and possibly up to 1 MeV. Hard K-{alpha} x-ray photons can be created through high-energy electro… more
Date: August 29, 2005
Creator: Park, H. S.; Chambers, D.; Clarke, R.; Eagleton, R.; Giraldez, E.; Goldsack, T. et al.
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Partner: UNT Libraries Government Documents Department
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Hot dense matter creation in short-pulse laser interaction with tamped foils

Description: The possibility of producing hot dense matter has important applications for the understanding of transport processes in inertial confinement fusion (ICF) [1] and laboratory astrophysics experiments [2]. While the success of ICF requires the correct solution of a complex interaction between laser coupling, equation-of-state, and particle transport problems, the possibility of experimentally recreating conditions found during the ignition phase in a simplified geometry is extremely appealing. In… more
Date: August 15, 2006
Creator: Chen, S.; Pasley, J.; Beg, F.; Gregori, G.; Evans, R. G.; Notley, M. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Using Vulcan to Recreate Planetary Cores

Description: An accurate equation of state (EOS) for planetary constituents at extreme conditions is the key to any credible model of planets or low mass stars. However, experimental validation has been carried out on at high pressure (>few Mbar), and then only on the principal Hugoniot. For planetary and stellar interiors, compression occurs from gravitational force so that material states follow a line of isentropic compression (ignoring phase separation) to ultra-high densities. An example of the pred… more
Date: August 15, 2001
Creator: Collins, G. W.; Celliers, P. M.; Hicks, D. G.; Mackinnon, A. J.; Moon, S. J.; Cauble, R. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Theoretical Model and Interpretation of Dense Plasma X-Ray Thomson Scattering

Description: The authors present analytical expressions for the dynamic structure factor, or form factor S(k,{omega}), which is the quantity describing the inelastic x-ray cross section from a dense plasma or a simple liquid. The results, based on the random phase approximation (RPA) for the treatment on the charged particle coupling, can be applied to describe scattering from either weakly coupled classical plasmas or degenerate electron liquids. The form factor correctly reproduces the Compton energy down… more
Date: April 3, 2002
Creator: Gregori, G.; Landen, O.; Hicks, D.; Pasley, J.; Collins, G.; Celliers, P. et al.
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Partner: UNT Libraries Government Documents Department
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