Bulletin of the American Physical Society
2005 47th Annual Meeting of the Division of Plasma Physics
Monday–Friday, October 24–28, 2005; Denver, Colorado
Session QZ1: Mini-conference Posters on Fast Ignition Status and Prospects |
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Room: Adam's Mark Hotel Plaza Ballroom D |
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QZ1.00001: Progress on Liquid Cryogenic Capsule Development for Fast Ignition with Z-Pinch-Driven Fuel Assembly D.L. Hanson, R.A. Vesey, D.B. Sinars, M.E. Cuneo, S.A. Slutz, J.L. Porter, C. Russell, D.G. Schroen, R.R. Johnston, K. Youngman We are currently developing a pulsed-power-based approach to fast ignitor fuel assembly where intense thermal x-rays from a z-pinch implosion drive the compression of a hemispherical fuel capsule in a vacuum secondary hohlraum. This asymmetric drive configuration, with hemi-capsule motion constrained by a planar high density glide surface, opens up new design possibilities for indirect-drive cryogenic fuel capsules. As an alternative to foam-stabilized cryogenic solid fuel layers, we are investigating cryogenic fast ignition capsules with a liquid fuel layer confined between a thick outer ablator shell and a thin inner shell. Several approaches are being explored for fabrication of thin (3-5 $\mu$m) inner shells. Progress toward demonstration of a working capsule will be presented. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy's National Nuclear Security Administration under Contract DE-AC04-94AL85000. [Preview Abstract] |
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QZ1.00002: Ion heating regimes for PW laser plasma interaction Tito Mendonca, Peter Norreys, Robert Bingham, J.R. Davies We explore the possible occurrence of preferential ion heating regimes for ultra intense laser plasma experiments, pertinent to fast ignition. We consider a coupled two-step mechanism, which is based on the excitation of an electron two stream instability, driven by a fast electron beam.~This creates a secondary beam of low group velocity plasmons that is modulationally unstable and resonantly decays into ion acoustic waves. These low frequency waves are then strongly damped by ion collisions in the dense plasma core. Such a model provides a simple explanation for the preferential heating of the bulk ion population observed in recent PW laser experiments. [Preview Abstract] |
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QZ1.00003: Simulations of Relativistic Electron Beam Instabilities for Applications to Fast Ignition L.A. Cottrill, K. Molvig, A.B. Langdon, B.F. Lasinski, M. Tabak, R.P.J. Town, S. Lund, A. Friedman Central to the feasibility of the fast ignition concept is the ability to transport an intense, well-collimated relativistic electron beam through a plasma to a high-density, pre-compressed core. It is well known that this electron beam is subject to a number of instabilities, such as the Weibel and filamentary instabilities, which might prevent efficient energy transport. A number of research groups are using the LSP [1] code to model relativistic electron beam transport for fast ignition. We have performed LSP simulations to benchmark the code against analytical theories of the critical beam-plasma instabilities relevant to fast ignition. In particular, we have explored the range of applicability of the implicit numerical model used in LSP. This work was performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under contract W-7405-ENG-48. [1] D.R. Welch, et al, Nucl. Inst. Meth. Phys. Res. A 242, 134 (2001). [Preview Abstract] |
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QZ1.00004: Hydrodynamics Instability in Cone-guided Implosion for Fast Ignition Hideo Nagatomo, Tomoyuki Johzaki, Atsushi Sunahara, Kunioki Mima The fast ignition scheme is one of the most fascinating and feasible ignition schemes for the inertial fusion energy. Fast Ignition Realization Experiment phase one (FIREX-I) program has been carried out at ILE Osaka since 2003. In the program, the most significant challenge is to heat the high-density DT fuel plasma which is imploded by the GXII laser system using non- spherical cryogenic target. Even though this cone-guided implosion process has been studied experimentally and computationally for a few years, it has some unsolved problems which must be solved before the experiments. In this paper, a computational study of those implosion physics and target design for FIREX-I experiment is discussed. In this work, we estimate the affect of RT instability of mode 4~32 which is perturbed on the shell target initially. Considering this result, we design the target structure and laser pulse shape for the FIREX-I experiment, and evaluate the formation of fuel core plasma quantitatively. This work was supported by JSPS (15GS0214). [Preview Abstract] |
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QZ1.00005: Multi-dimensional particle-in-cell simulation and analysis of ion acceleration from laser driven targets L. Yin, B.J. Albright, B.M. Hegelich, K.J. Bowers, T.J.T. Kwan, J.C. Fern\'{a}ndez Ion acceleration from laser-driven targets is of interest to fast ignition (FI) inertial confinement fusion applications. One of the critical questions which must be addressed, however, is whether the ion beams generated from ultra-intense lasers can be made efficient enough and bright enough to ignite a target plasma with realistic facilities. Recently, the authors have employed the state-of-the-art simulation code VPIC in the study of laser-ion acceleration physics. VPIC is a fully relativistic, charge-conserving, three-dimensional explicit particle-in-cell code with unprecedented efficiency and speed. The VPIC simulation platform allows high-fidelity multi-dimensional exploration of the underlying physical processes to be performed and for various concepts for improving beam conversion efficiency to be examined. This presentation will report on recent work on modeling beams and understanding how the ion beams may be improved for FI applications. Implications for the feasibility of ion-driven fast ignition will be discussed. [Preview Abstract] |
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QZ1.00006: A Research Program for Ion-Based Fast Ignition Juan C. Fern{\'a}ndez, B.J. Albright, K.A. Flippo, B.M. Hegelich, M.S. Murillo, M.T. Paffett, M.J. Schmitt, R. K. Schulze, S.A. Slutz We present a research program to evaluate fast ignition (FI) lit by laser-driven ion beams heavier than protons. Compared to protons, heavier ions have the potential advantage of a more localized energy deposition, which might translate into a significantly lower total beam-energy requirement. The starting points for this research are the target-design requirements in the study by Temporal {\it et al.} [Phys. Plasmas 9 (2002) 3098] and the recent demonstration of the capability to produce laser-driven quasi-mono-energetic ion beams, at the Los Alamos Trident laser facility by Hegelich {\it et al.} [Nature, submitted (2005)]. Based on our present theoretical understanding of the plasma physics and of the target-surface physics involved, we outline the development of the capability to accelerate mono-energetic beams within the constraints of a fast-ignition target. We discuss experiments necessary to validate, in the FI regime, applicable theory and modeling in warm-dense matter and beam-dense plasma interactions. Ultimately, we apply those improved models and existing target-design capability to understand the tradeoffs associated with using different ion species in FI, to optimize the scheme, and to design FI proof-of-principle experiments in a facility such as Z-R and Z-Beamlet [Preview Abstract] |
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QZ1.00007: Self-similar Isochoric Implosions for Fast Ignition Daniel Clark, Max Tabak Fast Ignition (FI) exploits the ignition of a dense, uniform fuel assembly by an external energy source to achieve high gain. However, in conventional ICF implosions, the fuel assembles as a dense shell surrounding a low density, high-pressure hotspot. Such configurations are far from optimal for FI. Here, it is shown that a self-similar spherical implosion of the type studied by Guderley [Luftfahrtforschung 19, 302 (1942).] and later Meyer-ter-Vehn \& Schalk [Z. Naturforsch. 37a, 955 (1982).] may be employed to implode dense, uniform fuel assemblies with minimal energy wastage in forming a hotspot. The connection to “realistic” (i.e., non-self-similar) implosion schemes using laser or X-ray drive is also investigated. [Preview Abstract] |
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