Use of 41Ar production to measure ablator areal density in NIF beryllium implosions

Wilson, Douglas Carl; Cassata, W. S.; Sepke, S. M.; Velsko, C. A.; Huang, H.; Yeamans, C. B.; Kline, John L.; Yi, A.; Simakov, Andrei Nikolaevich; Haan, S. W.; Batha, Steven H.; Dewald, E. L.; Rygg, J. R.; Tommasini, R.; Xu, H.; Kong, C.; Bae, J.; Rice, N.

doi:10.1063/1.4975187

Title: Use of ⁴¹Ar production to measure ablator areal density in NIF beryllium implosions

Abstract

For the first time, ⁴¹Ar produced by the (n,Y) reaction from ⁴⁰Ar in the beryllium shell of a DT filled Inertial Confinement Fusion capsule has been measured. Ar is co-deposited with beryllium in the sputter deposition of the capsule shell. Altogether with a measurement of the neutron yield, the radioactive ⁴¹Ar then quantifies the areal density of beryllium during the DT neutron production. The measured 1.15 ± 0.17 × 10⁺⁸ atoms of ⁴¹Ar are 2.5 times that from the best post-shot calculation, suggesting that the Ar and Be areal densities are correspondingly higher than those calculated. Possible explanations are that (1) the beryllium shell is compressed more than calculated, (2) beryllium has mixed into the cold DT ice, or more likely (3) less beryllium is ablated than calculated. Finally, since only one DT filled beryllium capsule has been fielded at NIF, these results can be confirmed and expanded in the future.

Authors:

^[1]; Cassata, W. S. ^[2]; Sepke, S. M. ^[2];

^[2]; Huang, H. ^[3];

^[2];

^[1]; Yi, A. ^[1];

^[1];

^[2]; Batha, Steven H. ^[1]; Dewald, E. L. ^[2]; Rygg, J. R. ^[2]; Tommasini, R. ^[2]; Xu, H. ^[3]; Kong, C. ^[3]; Bae, J. ^[3]; Rice, N. ^[3]

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

Publication Date:: Mon Feb 06 00:00:00 EST 2017

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

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)

OSTI Identifier:: 1351986

Alternate Identifier(s):: OSTI ID: 1416494

Report Number(s):: LA-UR-16-28102; LLNL-JRNL-734218
Journal ID: ISSN 1070-664X; TRN: US1700882

Grant/Contract Number:: AC52-06NA25396; AC52-07NA27344; NA00001808

Resource Type:: Accepted Manuscript

Journal Name:: Physics of Plasmas

Additional Journal Information:: Journal Volume: 24; Journal Issue: 2; Journal ID: ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)

Country of Publication:: United States

Language:: English

Subject:: 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ICF; NIF; beryllium; argon; radio-activation; 70 PLASMA PHYSICS AND FUSION

Citation Formats


                    Wilson, Douglas Carl, Cassata, W. S., Sepke, S. M., Velsko, C. A., Huang, H., Yeamans, C. B., Kline, John L., Yi, A., Simakov, Andrei Nikolaevich, Haan, S. W., Batha, Steven H., Dewald, E. L., Rygg, J. R., Tommasini, R., Xu, H., Kong, C., Bae, J., and Rice, N. Use of 41Ar production to measure ablator areal density in NIF beryllium implosions.  United States: N. p., 2017. 
Web.  doi:10.1063/1.4975187.

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                    Wilson, Douglas Carl, Cassata, W. S., Sepke, S. M., Velsko, C. A., Huang, H., Yeamans, C. B., Kline, John L., Yi, A., Simakov, Andrei Nikolaevich, Haan, S. W., Batha, Steven H., Dewald, E. L., Rygg, J. R., Tommasini, R., Xu, H., Kong, C., Bae, J., & Rice, N. Use of 41Ar production to measure ablator areal density in NIF beryllium implosions.  United States.  https://doi.org/10.1063/1.4975187

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                    Wilson, Douglas Carl, Cassata, W. S., Sepke, S. M., Velsko, C. A., Huang, H., Yeamans, C. B., Kline, John L., Yi, A., Simakov, Andrei Nikolaevich, Haan, S. W., Batha, Steven H., Dewald, E. L., Rygg, J. R., Tommasini, R., Xu, H., Kong, C., Bae, J., and Rice, N. Mon .  
"Use of 41Ar production to measure ablator areal density in NIF beryllium implosions".  United States.  https://doi.org/10.1063/1.4975187.  https://www.osti.gov/servlets/purl/1351986.

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@article{osti_1351986,

  title        = {Use of 41Ar production to measure ablator areal density in NIF beryllium implosions},

  author       = {Wilson, Douglas Carl and Cassata, W. S. and Sepke, S. M. and Velsko, C. A. and Huang, H. and Yeamans, C. B. and Kline, John L. and Yi, A. and Simakov, Andrei Nikolaevich and Haan, S. W. and Batha, Steven H. and Dewald, E. L. and Rygg, J. R. and Tommasini, R. and Xu, H. and Kong, C. and Bae, J. and Rice, N.},

  abstractNote = {For the first time, 41Ar produced by the (n,Y) reaction from 40Ar in the beryllium shell of a DT filled Inertial Confinement Fusion capsule has been measured. Ar is co-deposited with beryllium in the sputter deposition of the capsule shell. Altogether with a measurement of the neutron yield, the radioactive 41Ar then quantifies the areal density of beryllium during the DT neutron production. The measured 1.15 ± 0.17 × 10+8 atoms of 41Ar are 2.5 times that from the best post-shot calculation, suggesting that the Ar and Be areal densities are correspondingly higher than those calculated. Possible explanations are that (1) the beryllium shell is compressed more than calculated, (2) beryllium has mixed into the cold DT ice, or more likely (3) less beryllium is ablated than calculated. Finally, since only one DT filled beryllium capsule has been fielded at NIF, these results can be confirmed and expanded in the future.},

  doi          = {10.1063/1.4975187},

  journal      = {Physics of Plasmas},

  number       = 2,

  volume       = 24,

  place        = {United States},

  year         = {Mon Feb 06 00:00:00 EST 2017},

  month        = {Mon Feb 06 00:00:00 EST 2017}

}

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Title: Use of 41Ar production to measure ablator areal density in NIF beryllium implosions

Abstract

Citation Formats

First beryllium capsule implosions on the National Ignition Facility journal, May 2016

Dante soft x-ray power diagnostic for National Ignition Facility journal, October 2004

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Title: Use of ⁴¹Ar production to measure ablator areal density in NIF beryllium implosions

First beryllium capsule implosions on the National Ignition Facility
journal, May 2016

Dante soft x-ray power diagnostic for National Ignition Facility
journal, October 2004

2D X-Ray Radiography of Imploding Capsules at the National Ignition Facility
journal, May 2014

Tuning the Implosion Symmetry of ICF Targets via Controlled Crossed-Beam Energy Transfer
journal, January 2009

Modern Nuclear Data Evaluation with the TALYS Code System
journal, December 2012

The role of a detailed configuration accounting (DCA) atomic physics package in explaining the energy balance in ignition-scale hohlraums
journal, September 2011

South pole bang-time diagnostic on the National Ignition Facility (invited)
journal, October 2012

Gamma Reaction History ablator areal density constraints upon correlated diagnostic modeling of National Ignition Facility implosion experiments
journal, March 2015

The Radiochemical Analysis of Gaseous Samples (RAGS) apparatus for nuclear diagnostics at the National Ignition Facility (invited)
journal, October 2012

A high-resolution integrated model of the National Ignition Campaign cryogenic layered experiments
journal, May 2012

Diagnosing inertial confinement fusion gamma ray physics (invited)
journal, October 2010

Experimental validation of a diagnostic technique for tuning the fourth shock timing on National Ignition Facility
journal, January 2010

Streaked radiography measurements of convergent ablator performance (invited)
journal, October 2010

Measurements of the 40 Ar(n, γ ) 41 Ar radiative-capture cross section between 0.4 and 14.8 MeV
journal, September 2014

Determination of gaseous fission product yields from 14 MeV neutron induced fission of 238U at the National Ignition Facility
journal, January 2016

Nondestructive Quantitative Dopant Profiling Technique by Contact Radiography
journal, May 2006

The first measurements of soft x-ray flux from ignition scale Hohlraums at the National Ignition Facility using DANTE (invited)
journal, October 2010

Note: Radiochemical measurement of fuel and ablator areal densities in cryogenic implosions at the National Ignition Facility
journal, July 2015

Measurement of 0.1–3‐keV x rays from laser plasmas
journal, August 1986

Quantitative Radiography: Film Model Calibration and Dopant/Impurity Measurement in ICF Ablators
journal, May 2007

Three-dimensional HYDRA simulations of National Ignition Facility targets
journal, May 2001

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journal, March 2014

X-Ray Absorption Spectroscopy for ICF Target Characterization
journal, May 2009

Element-Specific Profiling for ICF Ablator Capsules with Mixed Dopant and Impurities
journal, May 2009