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Title: Kinetic simulations of fusion ignition with hot-spot ablator mix

Abstract

Inertial confinement fusion fuel suffers increased x-ray radiation losses when carbon from the capsule ablator mixes into the hot-spot. Here, we present one- and two-dimensional ion Vlasov-Fokker-Planck simulations that resolve hot-spot self-heating in the presence of a localized spike of carbon mix, totalling 1.9% of the hot-spot mass. The mix region cools and contracts over tens of picoseconds, increasing its α particle stopping power and radiative losses. Furthermore, this makes a localized mix region more severe than an equal amount of uniformly distributed mix. There is also a purely kinetic effect that reduces fusion reactivity by several percent, since faster ions in the tail of the distribution are absorbed by the mix region. Radiative cooling and contraction of the spike induces fluid motion, causing neutron spectrum broadening. This artificially increases the inferred experimental ion temperatures and gives line of sight variations.

Authors:
 [1];  [2];  [3];  [3];  [3];  [3];  [3];  [4];  [5]; ORCiD logo [2]; ORCiD logo [2];  [6]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Univ. of Oxford, Oxford (United Kingdom)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Oxford, Oxford (United Kingdom)
  4. STFC Rutherford Appleton Lab., Didcot (United Kingdom)
  5. STFC Rutherford Appleton Lab., Didcot (United Kingdom); Univ. of Strathclyde, Glasgow (United Kingdom)
  6. Univ. of Oxford, Oxford (United Kingdom); STFC Rutherford Appleton Lab., Didcot (United Kingdom)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
Universities/Institutions; USDOE
OSTI Identifier:
1565910
Alternate Identifier(s):
OSTI ID: 1560768
Report Number(s):
LA-UR-19-25923
Journal ID: ISSN 2470-0045; PLEEE8
Grant/Contract Number:  
89233218CNA000001; 20180040DR
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review E
Additional Journal Information:
Journal Volume: 100; Journal Issue: 3; Journal ID: ISSN 2470-0045
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Inertial Fusion

Citation Formats

Sadler, James D., Lu, Yingchao, Spiers, Benjamin, Mayr, Marko W., Savin, Alex, Wang, Robin H. W., Aboushelbaya, Ramy, Glize, Kevin, Bingham, Robert, Li, Hui, Flippo, Kirk A., and Norreys, Peter A. Kinetic simulations of fusion ignition with hot-spot ablator mix. United States: N. p., 2019. Web. doi:10.1103/PhysRevE.100.033206.
Sadler, James D., Lu, Yingchao, Spiers, Benjamin, Mayr, Marko W., Savin, Alex, Wang, Robin H. W., Aboushelbaya, Ramy, Glize, Kevin, Bingham, Robert, Li, Hui, Flippo, Kirk A., & Norreys, Peter A. Kinetic simulations of fusion ignition with hot-spot ablator mix. United States. doi:10.1103/PhysRevE.100.033206.
Sadler, James D., Lu, Yingchao, Spiers, Benjamin, Mayr, Marko W., Savin, Alex, Wang, Robin H. W., Aboushelbaya, Ramy, Glize, Kevin, Bingham, Robert, Li, Hui, Flippo, Kirk A., and Norreys, Peter A. Mon . "Kinetic simulations of fusion ignition with hot-spot ablator mix". United States. doi:10.1103/PhysRevE.100.033206.
@article{osti_1565910,
title = {Kinetic simulations of fusion ignition with hot-spot ablator mix},
author = {Sadler, James D. and Lu, Yingchao and Spiers, Benjamin and Mayr, Marko W. and Savin, Alex and Wang, Robin H. W. and Aboushelbaya, Ramy and Glize, Kevin and Bingham, Robert and Li, Hui and Flippo, Kirk A. and Norreys, Peter A.},
abstractNote = {Inertial confinement fusion fuel suffers increased x-ray radiation losses when carbon from the capsule ablator mixes into the hot-spot. Here, we present one- and two-dimensional ion Vlasov-Fokker-Planck simulations that resolve hot-spot self-heating in the presence of a localized spike of carbon mix, totalling 1.9% of the hot-spot mass. The mix region cools and contracts over tens of picoseconds, increasing its α particle stopping power and radiative losses. Furthermore, this makes a localized mix region more severe than an equal amount of uniformly distributed mix. There is also a purely kinetic effect that reduces fusion reactivity by several percent, since faster ions in the tail of the distribution are absorbed by the mix region. Radiative cooling and contraction of the spike induces fluid motion, causing neutron spectrum broadening. This artificially increases the inferred experimental ion temperatures and gives line of sight variations.},
doi = {10.1103/PhysRevE.100.033206},
journal = {Physical Review E},
number = 3,
volume = 100,
place = {United States},
year = {2019},
month = {9}
}

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