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Title: Exploring the limits of the National Ignition Facility's capsule coupling

Abstract

The original ignition ''point designs'' (circa 1992) for the National Ignition Facility (NIF) [J. A. Paisner, E. M. Campbell, and W. J. Hogan, Fusion Technol. 26, 755 (1994)] were made energetically conservative to provide margin for uncertainties in laser absorption, x-ray conversion efficiency and hohlraum-capsule coupling. Since that time, extensive experiments on Nova [J. T. Hunt and D. R. Speck, Opt. Eng. 28, 461 (1989)] and Omega [J. M. Soures et al., Phys. Plasmas 3, 2108 (1996)] and their related analysis indicate that NIF coupling efficiency may be almost ''as good as we could hope for.'' Given close agreement between experiment and theory/modeling, one can credibly explore target enhancements which couple more of NIFs energy to an ignition capsule. These include using optimized mixtures of materials to reduce x-ray wall losses, slightly reduced laser entrance holes, and laser operation strategies which increase the amount of energy one can extract from NIF. It is found that 3-4x increases in absorbed capsule energy appear possible, providing a potentially more robust target and {approx}10x increase in capsule yield. (c)

Authors:
 [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Laboratory, University of California, Livermore, California 94551 (United States)
Publication Date:
OSTI Identifier:
20216074
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 7; Journal Issue: 5; Other Information: PBD: May 2000; Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COUPLING; EFFICIENCY; THERMONUCLEAR IGNITION; LASER TARGETS; LASER-PRODUCED PLASMA; ICF DEVICES; LASER FUSION REACTORS; FUSION YIELD; EXPERIMENTAL DATA; THEORETICAL DATA

Citation Formats

Suter, L., Rothenberg, J., Munro, D., Van Wonterghem, B., and Haan, S. Exploring the limits of the National Ignition Facility's capsule coupling. United States: N. p., 2000. Web. doi:10.1063/1.873913.
Suter, L., Rothenberg, J., Munro, D., Van Wonterghem, B., & Haan, S. Exploring the limits of the National Ignition Facility's capsule coupling. United States. doi:10.1063/1.873913.
Suter, L., Rothenberg, J., Munro, D., Van Wonterghem, B., and Haan, S. Mon . "Exploring the limits of the National Ignition Facility's capsule coupling". United States. doi:10.1063/1.873913.
@article{osti_20216074,
title = {Exploring the limits of the National Ignition Facility's capsule coupling},
author = {Suter, L. and Rothenberg, J. and Munro, D. and Van Wonterghem, B. and Haan, S.},
abstractNote = {The original ignition ''point designs'' (circa 1992) for the National Ignition Facility (NIF) [J. A. Paisner, E. M. Campbell, and W. J. Hogan, Fusion Technol. 26, 755 (1994)] were made energetically conservative to provide margin for uncertainties in laser absorption, x-ray conversion efficiency and hohlraum-capsule coupling. Since that time, extensive experiments on Nova [J. T. Hunt and D. R. Speck, Opt. Eng. 28, 461 (1989)] and Omega [J. M. Soures et al., Phys. Plasmas 3, 2108 (1996)] and their related analysis indicate that NIF coupling efficiency may be almost ''as good as we could hope for.'' Given close agreement between experiment and theory/modeling, one can credibly explore target enhancements which couple more of NIFs energy to an ignition capsule. These include using optimized mixtures of materials to reduce x-ray wall losses, slightly reduced laser entrance holes, and laser operation strategies which increase the amount of energy one can extract from NIF. It is found that 3-4x increases in absorbed capsule energy appear possible, providing a potentially more robust target and {approx}10x increase in capsule yield. (c)},
doi = {10.1063/1.873913},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 7,
place = {United States},
year = {2000},
month = {5}
}