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Title: Demonstration of thermonuclear conditions in magnetized liner inertial fusion experiments

Abstract

The magnetized liner inertial fusion concept [S. A. Slutz et al., Phys. Plasmas 17, 056303 (2010)] utilizes a magnetic field and laser heating to relax the pressure requirements of inertial confinement fusion. The first experiments to test the concept [M. R. Gomez et al., Phys. Rev. Lett. 113, 155003 (2014)] were conducted utilizing the 19 MA, 100 ns Z machine, the 2.5 kJ, 1 TW Z Beamlet laser, and the 10 T Applied B-field on Z system. Despite an estimated implosion velocity of only 70 km/s in these experiments, electron and ion temperatures at stagnation were as high as 3 keV, and thermonuclear deuterium-deuterium neutron yields up to 2 × 10{sup 12} have been produced. X-ray emission from the fuel at stagnation had widths ranging from 50 to 110 μm over a roughly 80% of the axial extent of the target (6–8 mm) and lasted approximately 2 ns. X-ray yields from these experiments are consistent with a stagnation density of the hot fuel equal to 0.2–0.4 g/cm{sup 3}. In these experiments, up to 5 × 10{sup 10} secondary deuterium-tritium neutrons were produced. Given that the areal density of the plasma was approximately 1–2 mg/cm{sup 2}, this indicates the stagnation plasma was significantly magnetized, which is consistent with the anisotropy observed in the deuterium-tritiummore » neutron spectra. Control experiments where the laser and/or magnetic field were not utilized failed to produce stagnation temperatures greater than 1 keV and primary deuterium-deuterium yields greater than 10{sup 10}. An additional control experiment where the fuel contained a sufficient dopant fraction to substantially increase radiative losses also failed to produce a relevant stagnation temperature. The results of these experiments are consistent with a thermonuclear neutron source.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;  [1] more »; « less
  1. Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185 (United States)
Publication Date:
OSTI Identifier:
22410402
Resource Type:
Journal Article
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 22; Journal Issue: 5; Other Information: (c) 2015 AIP Publishing LLC; 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; DEUTERON REACTIONS; D-T OPERATION; ELECTRON TEMPERATURE; IMPLOSIONS; INERTIAL CONFINEMENT; ION TEMPERATURE; KEV RANGE; LASER-RADIATION HEATING; LINERS; MAGNETIC FIELDS; NEUTRON SOURCES; NEUTRON SPECTRA; PLASMA; STAGNATION; TARGETS; THERMONUCLEAR REACTIONS; TRITIUM

Citation Formats

Gomez, M. R., Slutz, S. A., Sefkow, A. B., Hahn, K. D., Hansen, S. B., Knapp, P. F., Schmit, P. F., Ruiz, C. L., Sinars, D. B., Harding, E. C., Jennings, C. A., Awe, T. J., Geissel, M., Rovang, D. C., Smith, I. C., Chandler, G. A., Cooper, G. W., Cuneo, M. E., Harvey-Thompson, A. J., Hess, M. H., and and others. Demonstration of thermonuclear conditions in magnetized liner inertial fusion experiments. United States: N. p., 2015. Web. doi:10.1063/1.4919394.
Gomez, M. R., Slutz, S. A., Sefkow, A. B., Hahn, K. D., Hansen, S. B., Knapp, P. F., Schmit, P. F., Ruiz, C. L., Sinars, D. B., Harding, E. C., Jennings, C. A., Awe, T. J., Geissel, M., Rovang, D. C., Smith, I. C., Chandler, G. A., Cooper, G. W., Cuneo, M. E., Harvey-Thompson, A. J., Hess, M. H., & and others. Demonstration of thermonuclear conditions in magnetized liner inertial fusion experiments. United States. doi:10.1063/1.4919394.
Gomez, M. R., Slutz, S. A., Sefkow, A. B., Hahn, K. D., Hansen, S. B., Knapp, P. F., Schmit, P. F., Ruiz, C. L., Sinars, D. B., Harding, E. C., Jennings, C. A., Awe, T. J., Geissel, M., Rovang, D. C., Smith, I. C., Chandler, G. A., Cooper, G. W., Cuneo, M. E., Harvey-Thompson, A. J., Hess, M. H., and and others. Fri . "Demonstration of thermonuclear conditions in magnetized liner inertial fusion experiments". United States. doi:10.1063/1.4919394.
@article{osti_22410402,
title = {Demonstration of thermonuclear conditions in magnetized liner inertial fusion experiments},
author = {Gomez, M. R. and Slutz, S. A. and Sefkow, A. B. and Hahn, K. D. and Hansen, S. B. and Knapp, P. F. and Schmit, P. F. and Ruiz, C. L. and Sinars, D. B. and Harding, E. C. and Jennings, C. A. and Awe, T. J. and Geissel, M. and Rovang, D. C. and Smith, I. C. and Chandler, G. A. and Cooper, G. W. and Cuneo, M. E. and Harvey-Thompson, A. J. and Hess, M. H. and and others},
abstractNote = {The magnetized liner inertial fusion concept [S. A. Slutz et al., Phys. Plasmas 17, 056303 (2010)] utilizes a magnetic field and laser heating to relax the pressure requirements of inertial confinement fusion. The first experiments to test the concept [M. R. Gomez et al., Phys. Rev. Lett. 113, 155003 (2014)] were conducted utilizing the 19 MA, 100 ns Z machine, the 2.5 kJ, 1 TW Z Beamlet laser, and the 10 T Applied B-field on Z system. Despite an estimated implosion velocity of only 70 km/s in these experiments, electron and ion temperatures at stagnation were as high as 3 keV, and thermonuclear deuterium-deuterium neutron yields up to 2 × 10{sup 12} have been produced. X-ray emission from the fuel at stagnation had widths ranging from 50 to 110 μm over a roughly 80% of the axial extent of the target (6–8 mm) and lasted approximately 2 ns. X-ray yields from these experiments are consistent with a stagnation density of the hot fuel equal to 0.2–0.4 g/cm{sup 3}. In these experiments, up to 5 × 10{sup 10} secondary deuterium-tritium neutrons were produced. Given that the areal density of the plasma was approximately 1–2 mg/cm{sup 2}, this indicates the stagnation plasma was significantly magnetized, which is consistent with the anisotropy observed in the deuterium-tritium neutron spectra. Control experiments where the laser and/or magnetic field were not utilized failed to produce stagnation temperatures greater than 1 keV and primary deuterium-deuterium yields greater than 10{sup 10}. An additional control experiment where the fuel contained a sufficient dopant fraction to substantially increase radiative losses also failed to produce a relevant stagnation temperature. The results of these experiments are consistent with a thermonuclear neutron source.},
doi = {10.1063/1.4919394},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 22,
place = {United States},
year = {2015},
month = {5}
}