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Title: Target design for high fusion yield with the double Z-pinch-driven hohlraum

Abstract

A key demonstration on the path to inertial fusion energy is the achievement of high fusion yield (hundreds of MJ) and high target gain. Toward this goal, an indirect-drive high-yield inertial confinement fusion (ICF) target involving two Z-pinch x-ray sources heating a central secondary hohlraum is described by Hammer et al. [Phys. Plasmas 6, 2129 (1999)]. In subsequent research at Sandia National Laboratories, theoretical/computational models have been developed and an extensive series of validation experiments have been performed to study hohlraum energetics, capsule coupling, and capsule implosion symmetry for this system. These models have been used to design a high-yield Z-pinch-driven ICF target that incorporates the latest experience in capsule design, hohlraum symmetry control, and x-ray production by Z pinches. An x-ray energy output of 9 MJ per pinch, suitably pulse-shaped, is sufficient for this concept to drive 0.3-0.5 GJ capsules. For the first time, integrated two-dimensional (2D) hohlraum/capsule radiation-hydrodynamics simulations have demonstrated adequate hohlraum coupling, time-dependent radiation symmetry control, and the successful implosion, ignition, and burn of a high-yield capsule in the double Z-pinch hohlraum. An important new feature of this target design is mode-selective symmetry control: the use of burn-through shields offset from the capsule that selectively tunemore » certain low-order asymmetry modes (P{sub 2},P{sub 4}) without significantly perturbing higher-order modes and without a significant energy penalty. This paper will describe the capsule and hohlraum design that have produced 0.4-0.5 GJ yields in 2D simulations, provide a preliminary estimate of the Z-pinch load and accelerator requirements necessary to drive the system, and suggest future directions for target design work.« less

Authors:
; ; ; ; ; ; ; ; ; ; ;  [1]
  1. Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1186 (United States)
Publication Date:
OSTI Identifier:
20975060
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 14; Journal Issue: 5; Other Information: DOI: 10.1063/1.2472364; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATORS; CAPSULES; DESIGN; FUSION YIELD; HYDRODYNAMICS; ICF DEVICES; IMPLOSIONS; INERTIAL CONFINEMENT; INERTIAL FUSION DRIVERS; PLASMA; PLASMA SIMULATION; SANDIA NATIONAL LABORATORIES; SYMMETRY; THERMONUCLEAR REACTORS; TIME DEPENDENCE; TWO-DIMENSIONAL CALCULATIONS; VALIDATION; X RADIATION; X-RAY SOURCES

Citation Formats

Vesey, R. A., Herrmann, M. C., Lemke, R. W., Desjarlais, M. P., Cuneo, M. E., Stygar, W. A., Bennett, G. R., Campbell, R. B., Christenson, P. J., Mehlhorn, T. A., Porter, J. L., and Slutz, S. A. Target design for high fusion yield with the double Z-pinch-driven hohlraum. United States: N. p., 2007. Web. doi:10.1063/1.2472364.
Vesey, R. A., Herrmann, M. C., Lemke, R. W., Desjarlais, M. P., Cuneo, M. E., Stygar, W. A., Bennett, G. R., Campbell, R. B., Christenson, P. J., Mehlhorn, T. A., Porter, J. L., & Slutz, S. A. Target design for high fusion yield with the double Z-pinch-driven hohlraum. United States. doi:10.1063/1.2472364.
Vesey, R. A., Herrmann, M. C., Lemke, R. W., Desjarlais, M. P., Cuneo, M. E., Stygar, W. A., Bennett, G. R., Campbell, R. B., Christenson, P. J., Mehlhorn, T. A., Porter, J. L., and Slutz, S. A. Tue . "Target design for high fusion yield with the double Z-pinch-driven hohlraum". United States. doi:10.1063/1.2472364.
@article{osti_20975060,
title = {Target design for high fusion yield with the double Z-pinch-driven hohlraum},
author = {Vesey, R. A. and Herrmann, M. C. and Lemke, R. W. and Desjarlais, M. P. and Cuneo, M. E. and Stygar, W. A. and Bennett, G. R. and Campbell, R. B. and Christenson, P. J. and Mehlhorn, T. A. and Porter, J. L. and Slutz, S. A.},
abstractNote = {A key demonstration on the path to inertial fusion energy is the achievement of high fusion yield (hundreds of MJ) and high target gain. Toward this goal, an indirect-drive high-yield inertial confinement fusion (ICF) target involving two Z-pinch x-ray sources heating a central secondary hohlraum is described by Hammer et al. [Phys. Plasmas 6, 2129 (1999)]. In subsequent research at Sandia National Laboratories, theoretical/computational models have been developed and an extensive series of validation experiments have been performed to study hohlraum energetics, capsule coupling, and capsule implosion symmetry for this system. These models have been used to design a high-yield Z-pinch-driven ICF target that incorporates the latest experience in capsule design, hohlraum symmetry control, and x-ray production by Z pinches. An x-ray energy output of 9 MJ per pinch, suitably pulse-shaped, is sufficient for this concept to drive 0.3-0.5 GJ capsules. For the first time, integrated two-dimensional (2D) hohlraum/capsule radiation-hydrodynamics simulations have demonstrated adequate hohlraum coupling, time-dependent radiation symmetry control, and the successful implosion, ignition, and burn of a high-yield capsule in the double Z-pinch hohlraum. An important new feature of this target design is mode-selective symmetry control: the use of burn-through shields offset from the capsule that selectively tune certain low-order asymmetry modes (P{sub 2},P{sub 4}) without significantly perturbing higher-order modes and without a significant energy penalty. This paper will describe the capsule and hohlraum design that have produced 0.4-0.5 GJ yields in 2D simulations, provide a preliminary estimate of the Z-pinch load and accelerator requirements necessary to drive the system, and suggest future directions for target design work.},
doi = {10.1063/1.2472364},
journal = {Physics of Plasmas},
number = 5,
volume = 14,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}