Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas

Hayes, A. C.; Jungman, Gerard; Schulz, A. E.; Boswell, M.; Fowler, M. M.; Grim, G.; Klein, A.; Rundberg, R. S.; Wilhelmy, J. B.; Wilson, D.; Cerjan, C.; Schneider, D.; Sepke, S. M.; Tonchev, A.; Yeamans, C.

doi:10.1063/1.4928104

Title: Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas

Abstract

We present the first measurements of reaction-in-flight (RIF) neutrons in an inertial confinement fusion system. The experiments were carried out at the National Ignition Facility, using both Low Foot and High Foot drives and cryogenic plastic capsules. In both cases, the high-energy RIF (E_n > 15 MeV) component of the neutron spectrum was found to be about 10^–4 of the total. The majority of the RIF neutrons were produced in the dense cold fuel surrounding the burning hotspot of the capsule, and the data are consistent with a compressed cold fuel that is moderately to strongly coupled (Γ~ 0.6) and electron degenerate (θ_Fermi/θ_e~ 4). The production of RIF neutrons is controlled by the stopping power in the plasma. Thus, the current RIF measurements provide a unique test of stopping power models in an experimentally unexplored plasma regime. In conclusion, we find that the measured RIF data strongly constrain stopping models in warm dense plasma conditions, and some models are ruled out by our analysis of these experiments.

Authors:

Hayes, A. C. ^[1]; Jungman, Gerard ^[1]; Schulz, A. E. ^[1];

^[1]; Fowler, M. M. ^[1]; Grim, G. ^[1]; Klein, A. ^[1];

^[1];

^[1]; Wilson, D. ^[1];

^[2]; Schneider, D. ^[2]; Sepke, S. M. ^[2]; Tonchev, A. ^[2];

^[2]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:: Thu Aug 06 00:00:00 EDT 2015

Research Org.:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1234914

Alternate Identifier(s):: OSTI ID: 1229577

Report Number(s):: LA-UR-14-29105
Journal ID: ISSN 1070-664X; PHPAEN

Grant/Contract Number:: AC52-06NA25396; Not applicable

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 22; Journal Issue: 8; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; neutrons; collisional energy loss; plasma temperature; cryogenics; plasma diagnostics

Citation Formats


                    Hayes, A. C., Jungman, Gerard, Schulz, A. E., Boswell, M., Fowler, M. M., Grim, G., Klein, A., Rundberg, R. S., Wilhelmy, J. B., Wilson, D., Cerjan, C., Schneider, D., Sepke, S. M., Tonchev, A., and Yeamans, C. Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas.  United States: N. p., 2015. 
Web.  doi:10.1063/1.4928104.

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                    Hayes, A. C., Jungman, Gerard, Schulz, A. E., Boswell, M., Fowler, M. M., Grim, G., Klein, A., Rundberg, R. S., Wilhelmy, J. B., Wilson, D., Cerjan, C., Schneider, D., Sepke, S. M., Tonchev, A., & Yeamans, C. Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas.  United States.  https://doi.org/10.1063/1.4928104

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                    Hayes, A. C., Jungman, Gerard, Schulz, A. E., Boswell, M., Fowler, M. M., Grim, G., Klein, A., Rundberg, R. S., Wilhelmy, J. B., Wilson, D., Cerjan, C., Schneider, D., Sepke, S. M., Tonchev, A., and Yeamans, C. Thu .  
"Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas".  United States.  https://doi.org/10.1063/1.4928104.  https://www.osti.gov/servlets/purl/1234914.

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@article{osti_1234914,

  title        = {Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas},

  author       = {Hayes, A. C. and Jungman, Gerard and Schulz, A. E. and Boswell, M. and Fowler, M. M. and Grim, G. and Klein, A. and Rundberg, R. S. and Wilhelmy, J. B. and Wilson, D. and Cerjan, C. and Schneider, D. and Sepke, S. M. and Tonchev, A. and Yeamans, C.},

  abstractNote = {We present the first measurements of reaction-in-flight (RIF) neutrons in an inertial confinement fusion system. The experiments were carried out at the National Ignition Facility, using both Low Foot and High Foot drives and cryogenic plastic capsules. In both cases, the high-energy RIF (En > 15 MeV) component of the neutron spectrum was found to be about 10–4 of the total. The majority of the RIF neutrons were produced in the dense cold fuel surrounding the burning hotspot of the capsule, and the data are consistent with a compressed cold fuel that is moderately to strongly coupled (Γ~ 0.6) and electron degenerate (θFermi/θe~ 4). The production of RIF neutrons is controlled by the stopping power in the plasma. Thus, the current RIF measurements provide a unique test of stopping power models in an experimentally unexplored plasma regime. In conclusion, we find that the measured RIF data strongly constrain stopping models in warm dense plasma conditions, and some models are ruled out by our analysis of these experiments.},

  doi          = {10.1063/1.4928104},

  journal      = {Physics of Plasmas},

  number       = 8,

  volume       = 22,

  place        = {United States},

  year         = {Thu Aug 06 00:00:00 EDT 2015},

  month        = {Thu Aug 06 00:00:00 EDT 2015}

}

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