Neutron time-of-flight signals from expanding or contracting spherical sources

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The width of the energy distribution of fusion-produced neutrons is often used as an indication of the temperature of the reacting ions. The Doppler broadening of the neutron energy is due to the center-of-mass velocity of reacting ion pairs and is characterized by the ion temperature for a Maxwellian distribution of ions with zero collective velocity. If there is bulk fluid motion or turbulence characterized by a velocity on the order of the ion thermal speed, a significant additional broadening may introduced. Suggestions of this phenomenon have been observed for two classes of laser targets. The first is a ``gas ... continued below

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17 p.

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Murphy, T.J.; Chrien, R.E. & Klare, K.A. June 1, 1996.

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Description

The width of the energy distribution of fusion-produced neutrons is often used as an indication of the temperature of the reacting ions. The Doppler broadening of the neutron energy is due to the center-of-mass velocity of reacting ion pairs and is characterized by the ion temperature for a Maxwellian distribution of ions with zero collective velocity. If there is bulk fluid motion or turbulence characterized by a velocity on the order of the ion thermal speed, a significant additional broadening may introduced. Suggestions of this phenomenon have been observed for two classes of laser targets. The first is a ``gas bag`` target, in which a deuterated hydrocarbon gas is contained in a thin spherical membrane and illuminated uniformly. The second target is an ICF capsule with a deuterated plastic inner layer. In both cases, measured neutron energy distributions were wider than expected from theoretical ion temperatures alone would predict, and if interpreted as indicative of the ion temperature, are inconsistent with the neutron yields observed.

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17 p.

Notes

INIS; OSTI as DE96011279

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  • 11. high temperature plasma diagnostic conference, Monterey, CA (United States), 13-17 Jun 1996

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  • Other: DE96011279
  • Report No.: LA-UR--96-1650
  • Report No.: CONF-9606208--6
  • Grant Number: W-7405-ENG-36;W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 244643
  • Archival Resource Key: ark:/67531/metadc669282

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  • June 1, 1996

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  • June 29, 2015, 9:42 p.m.

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  • Aug. 1, 2016, 12:46 p.m.

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Murphy, T.J.; Chrien, R.E. & Klare, K.A. Neutron time-of-flight signals from expanding or contracting spherical sources, article, June 1, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc669282/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.