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Title: Polar-drive designs for optimizing neutron yields on the National Ignition Facility

Abstract

Polar-drive designs are proposed for producing symmetric implosions of thin-shell, DT gas-filled targets leading to high fusion-neutron yields for neutron-diagnostic development. The designs can be implemented as soon as the National Ignition Facility (NIF) [E. M. Campbell and W. J. Hogan, Plasma Phys. Control. Fusion 41, B39 (1999)] is operational as they use indirect-drive phase plates. Two-dimensional simulations using the hydrodynamics code SAGE [R. S. Craxton and R. L. McCrory, J. Appl. Phys. 56, 108 (1984)] have shown that good low-mode uniformity can be obtained by choosing combinations of pointing and defocusing of the beams, including pointing offsets of individual beams within some of the NIF laser-beam quads. The optimizations have been carried out for total laser energies ranging from 350 kJ to 1.5 MJ, enabling the optimum pointing and defocusing parameters to be determined through interpolation for any given laser energy in this range. Neutron yields in the range of 10{sup 15}-10{sup 16} are expected.

Authors:
; ;  [1]
  1. Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623 (United States)
Publication Date:
OSTI Identifier:
21120526
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 15; Journal Issue: 8; Other Information: DOI: 10.1063/1.2975213; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1070-664X
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BEAMS; CONTROL; DESIGN; HYDRODYNAMICS; IMPLOSIONS; LASERS; NEUTRON SOURCES; NEUTRONS; OPTIMIZATION; PLASMA; PLASMA SIMULATION; THERMONUCLEAR IGNITION; THERMONUCLEAR REACTORS; TWO-DIMENSIONAL CALCULATIONS; US NATIONAL IGNITION FACILITY; YIELDS

Citation Formats

Cok, A. M., Craxton, R. S., and McKenty, P. W. Polar-drive designs for optimizing neutron yields on the National Ignition Facility. United States: N. p., 2008. Web. doi:10.1063/1.2975213.
Cok, A. M., Craxton, R. S., & McKenty, P. W. Polar-drive designs for optimizing neutron yields on the National Ignition Facility. United States. doi:10.1063/1.2975213.
Cok, A. M., Craxton, R. S., and McKenty, P. W. Fri . "Polar-drive designs for optimizing neutron yields on the National Ignition Facility". United States. doi:10.1063/1.2975213.
@article{osti_21120526,
title = {Polar-drive designs for optimizing neutron yields on the National Ignition Facility},
author = {Cok, A. M. and Craxton, R. S. and McKenty, P. W.},
abstractNote = {Polar-drive designs are proposed for producing symmetric implosions of thin-shell, DT gas-filled targets leading to high fusion-neutron yields for neutron-diagnostic development. The designs can be implemented as soon as the National Ignition Facility (NIF) [E. M. Campbell and W. J. Hogan, Plasma Phys. Control. Fusion 41, B39 (1999)] is operational as they use indirect-drive phase plates. Two-dimensional simulations using the hydrodynamics code SAGE [R. S. Craxton and R. L. McCrory, J. Appl. Phys. 56, 108 (1984)] have shown that good low-mode uniformity can be obtained by choosing combinations of pointing and defocusing of the beams, including pointing offsets of individual beams within some of the NIF laser-beam quads. The optimizations have been carried out for total laser energies ranging from 350 kJ to 1.5 MJ, enabling the optimum pointing and defocusing parameters to be determined through interpolation for any given laser energy in this range. Neutron yields in the range of 10{sup 15}-10{sup 16} are expected.},
doi = {10.1063/1.2975213},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 8,
volume = 15,
place = {United States},
year = {2008},
month = {8}
}