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Title: Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions

Abstract

In inertial con finement fusion implosion experiments, the presence of residual anisotropic fluid motion within the stagnating hot spot leads to signifi cant variations in ion-temperature measurements using neutron time- of-flight detectors along different lines of sight. The minimum ion-temperature measurement is typically used as representative of the thermal temperature. In the presence of isotropic flows, however, even the minimum DT neutron-inferred ion temperature can be well above the plasma thermal temperature. Using both DD and DT neutron-inferred ion-temperature measurements, we show that it is possible to determine the contribution of isotropic flows and infer the DT burn-averaged thermal ion temperature. The contribution of large isotropic flows on driving the ratio of DD to DT neutron-inferred ion temperatures well below unity and approaching the lower bound of 0.8 is demonstrated in multimode simulations. The minimum DD neutron- inferred ion temperature is determined from the velocity variance analysis, accounting for the presence of isotropic flows. Being close to the DT burn-averaged thermal ion temperature, the inferred DD minimum ion temperatures demonstrate a strong correlation with the experimental yields in the OMEGA implosion database. An analytical expression is also derived to explain the effect of mode ℓ = 1 ion-temperature measurement asymmetrymore » on yield degradations caused by the anisotropic flows.« less

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1];  [1];  [1];  [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [1]
  1. Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Publication Date:
Research Org.:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1634008
Alternate Identifier(s):
OSTI ID: 1631390
Report Number(s):
2019-218, 2524, 1568
Journal ID: ISSN 1070-664X; 2019-218, 2524, 1568
Grant/Contract Number:  
NA0003856
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 27; Journal Issue: 6; Conference: 61. Annual Meeting of the APS Division of Plasma Physics, Fort Lauderdale, FL (United states), 21-25 Oct 2019; 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

Citation Formats

Woo, K. M., Betti, R., Mannion, O. M., Forrest, C. J., Knauer, J. P., Goncharov, V. N., Radha, P. B., Patel, D., Gopalaswamy, V., and Glebov, V. Yu. Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions. United States: N. p., 2020. Web. doi:10.1063/1.5144460.
Woo, K. M., Betti, R., Mannion, O. M., Forrest, C. J., Knauer, J. P., Goncharov, V. N., Radha, P. B., Patel, D., Gopalaswamy, V., & Glebov, V. Yu. Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions. United States. doi:https://doi.org/10.1063/1.5144460
Woo, K. M., Betti, R., Mannion, O. M., Forrest, C. J., Knauer, J. P., Goncharov, V. N., Radha, P. B., Patel, D., Gopalaswamy, V., and Glebov, V. Yu. Mon . "Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions". United States. doi:https://doi.org/10.1063/1.5144460.
@article{osti_1634008,
title = {Inferring thermal ion temperature and residual kinetic energy from nuclear measurements in inertial confinement fusion implosions},
author = {Woo, K. M. and Betti, R. and Mannion, O. M. and Forrest, C. J. and Knauer, J. P. and Goncharov, V. N. and Radha, P. B. and Patel, D. and Gopalaswamy, V. and Glebov, V. Yu.},
abstractNote = {In inertial con finement fusion implosion experiments, the presence of residual anisotropic fluid motion within the stagnating hot spot leads to signifi cant variations in ion-temperature measurements using neutron time- of-flight detectors along different lines of sight. The minimum ion-temperature measurement is typically used as representative of the thermal temperature. In the presence of isotropic flows, however, even the minimum DT neutron-inferred ion temperature can be well above the plasma thermal temperature. Using both DD and DT neutron-inferred ion-temperature measurements, we show that it is possible to determine the contribution of isotropic flows and infer the DT burn-averaged thermal ion temperature. The contribution of large isotropic flows on driving the ratio of DD to DT neutron-inferred ion temperatures well below unity and approaching the lower bound of 0.8 is demonstrated in multimode simulations. The minimum DD neutron- inferred ion temperature is determined from the velocity variance analysis, accounting for the presence of isotropic flows. Being close to the DT burn-averaged thermal ion temperature, the inferred DD minimum ion temperatures demonstrate a strong correlation with the experimental yields in the OMEGA implosion database. An analytical expression is also derived to explain the effect of mode ℓ = 1 ion-temperature measurement asymmetry on yield degradations caused by the anisotropic flows.},
doi = {10.1063/1.5144460},
journal = {Physics of Plasmas},
number = 6,
volume = 27,
place = {United States},
year = {2020},
month = {6}
}

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