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in creator/contributor: "Langdon, B."  
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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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Chamber propagation

Description: Propagation of a heavy ion beam to the target appears possible under conditions thought to be realizable by several reactor designs. Beam quality at the lens is believed to provide adequate intensity at the target -- but the beam must pass through chamber debris and its self fields along the way. This paper reviews present consensus on propagation modes and presents recent results on the effects of photoionization of the beam ions by thermal x-rays from the heated target. Ballistic propagation … more
Date: January 16, 1991
Creator: Langdon, B.
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Partner: UNT Libraries Government Documents Department
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Fast Ignition: Physics Progress in the US Fusion Energy Program and Prospects for Achieving Ignition.

Description: Fast ignition (FI) has significant potential advantages for inertial fusion energy and it is therefore being studied as an exploratory concept in the US fusion energy program. FI is based on short pulse isochoric heating of pre-compressed DT by intense beams of laser accelerated MeV electrons or protons. Recent experimental progress in the study of these two heating processes is discussed. The goal is to benchmark new models in order to predict accurately the requirements for full-scale fast ig… more
Date: October 16, 2002
Creator: Key, M. H.; Andersen, C.; Cowan, T.; Fisch, N.; Freeman, R.; Hatchett, S. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The First Experiments on the National Ignition Facility

Description: A first set of laser-plasma interaction, hohlraum energetics and hydrodynamic experiments have been performed using the first 4 beams of the National Ignition Facility (NIF), in support of indirect drive Inertial Confinement Fusion (ICF) and High Energy Density Physics (HEDP). In parallel, a robust set of optical and x-ray spectrometers, interferometer, calorimeters and imagers have been activated. The experiments have been undertaken with laser powers and energies of up to 8 TW and 17 kJ in fl… more
Date: November 11, 2005
Creator: Landen, O. L.; Glenzer, S.; Froula, D.; Dewald, E.; Suter, L. J.; Schneider, 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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White Paper on Ion Beam Transport for ICF: Issues, R&D Need,and Tri-Lab Plans

Description: To date, most resources for ion beam fusion have been devoted to development of accelerators and target physics; relatively few resources have gone into ion beam transport development. Because of theoretical studies and substantial experience with electron beam transport, the ion beam transport community is now poised to develop and optimize ion beam transport for ICF. Because of this Tri-Lab effort, a path for coordinated development of ion beam transport has been established. The rate of prog… more
Date: May 4, 2005
Creator: Olson, C.; Lee, E. & Langdon, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Studies of Electron Transport and Isochoric Heating and Their Applicability to Fast Ignition

Description: Experimental measurements of electron transport and isochoric heating in 100 J, 1 ps laser irradiation of solid A1 targets are presented. Modeling with a hybrid PIC code is compared with the data and good agreement is obtained using a heuristic model for the electron injection. The relevance for fast ignition is discussed.
Date: October 30, 2003
Creator: Key, M. H.; Amiranoff, F.; Andersen, C.; Batani, D.; Baton, S. D.; Cowan, T. et al.
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Partner: UNT Libraries Government Documents Department
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Laser light absorption with density profile modifications

Description: Two-dimensional computer simulations studied plasma heating by electron plasma waves. The results emphasize the importance of nonlinear steepening of the density profile near the critical density. A typical simulation result is presented in order to illustrate these profile modifications. It is shown that large dc magnetic field generation is an inherent property of the absorption of obliquely-incident light. (MOW)
Date: December 1, 1974
Creator: Kruer, W.; Valeo, E.; Estabrook, K.; Langdon, B. & Lasinski, B.
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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.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Proton Radiography of Laser-Plasma Interactions with Picosecond Time Resolution

Description: Radiography of laser-produced plasmas with MeV protons has the potential to provide new information on plasma conditions in extreme states of matter. Protons with energies up to many hundreds MeV, produced by large scale accelerators have been recently been used to obtain mass density radiographs of the behavior of large samples which have been shocked on microsecond timescales with approximately mm spatial resolution. The recent discovery of laminar proton beams accelerated to multi-MeV energi… more
Date: February 10, 2005
Creator: Mackinnon, A. J.; Patel, P. K.; Town, R. J.; Hatchett, S. P.; Hicks, D.; Phillips, T. H. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Workshop on transport for a common ion driver

Description: This report contains research in the following areas related to beam transport for a common ion driver: multi-gap acceleration; neutralization with electrons; gas neutralization; self-pinched transport; HIF and LIF transport, and relevance to common ion driver; LIF and HIF reactor concepts and relevance to common ion driver; atomic physics for common ion driver; code capabilities and needed improvement.
Date: December 31, 1994
Creator: Olson, C.C.; Lee, E. & Langdon, B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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