skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Effects of alpha stopping power modelling on the ignition threshold in a directly-driven inertial confinement fusion capsule

Abstract

The alpha-particle energy deposition mechanism modifies the ignition conditions of the thermonuclear Deuterium-Tritium fusion reactions, and constitutes a key issue in achieving high gain in Inertial Confinement Fusion implosions. One-dimensional hydrodynamic calculations have been performed with the code Multi-IFE to simulate the implosion of a capsule directly irradiated by a laser beam. The diffusion approximation for the alpha energy deposition has been used to optimize three laser profiles corresponding to different implosion velocities. A Monte-Carlo package has been included in Multi-IFE to calculate the alpha energy transport, and in this case the energy deposition uses both the LP and the BPS stopping power models. Homothetic transformations that maintain a constant implosion velocity have been used to map out the transition region between marginally-igniting and high-gain configurations. Furthermore, the results provided by the two models have been compared and it is found that – close to the ignition threshold – in order to produce the same fusion energy, the calculations performed with the BPS model require about 10% more invested energy with respect to the LP model.

Authors:
 [1];  [2];  [2];  [3];  [4]
  1. ENS Cachan and CNRS, Cachan Cedex (France)
  2. CEA, Arpajon Cedex (France)
  3. Univ. Politecnica de Madrid, Madrid (Spain)
  4. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1375175
Report Number(s):
LA-UR-17-20568
Journal ID: ISSN 1434-6060
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
European Physical Journal. D, Atomic, Molecular and Optical Physics
Additional Journal Information:
Journal Volume: 71; Journal Issue: 5; Journal ID: ISSN 1434-6060
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; direct drive ICF; alpha stopping power; ignition threshold; plasma physics

Citation Formats

Temporal, Mauro, Canaud, Benoit, Cayzac, Witold, Ramis, Rafael, and Singleton, Jr., Robert L. Effects of alpha stopping power modelling on the ignition threshold in a directly-driven inertial confinement fusion capsule. United States: N. p., 2017. Web. doi:10.1140/epjd/e2017-80126-6.
Temporal, Mauro, Canaud, Benoit, Cayzac, Witold, Ramis, Rafael, & Singleton, Jr., Robert L. Effects of alpha stopping power modelling on the ignition threshold in a directly-driven inertial confinement fusion capsule. United States. doi:10.1140/epjd/e2017-80126-6.
Temporal, Mauro, Canaud, Benoit, Cayzac, Witold, Ramis, Rafael, and Singleton, Jr., Robert L. Thu . "Effects of alpha stopping power modelling on the ignition threshold in a directly-driven inertial confinement fusion capsule". United States. doi:10.1140/epjd/e2017-80126-6. https://www.osti.gov/servlets/purl/1375175.
@article{osti_1375175,
title = {Effects of alpha stopping power modelling on the ignition threshold in a directly-driven inertial confinement fusion capsule},
author = {Temporal, Mauro and Canaud, Benoit and Cayzac, Witold and Ramis, Rafael and Singleton, Jr., Robert L.},
abstractNote = {The alpha-particle energy deposition mechanism modifies the ignition conditions of the thermonuclear Deuterium-Tritium fusion reactions, and constitutes a key issue in achieving high gain in Inertial Confinement Fusion implosions. One-dimensional hydrodynamic calculations have been performed with the code Multi-IFE to simulate the implosion of a capsule directly irradiated by a laser beam. The diffusion approximation for the alpha energy deposition has been used to optimize three laser profiles corresponding to different implosion velocities. A Monte-Carlo package has been included in Multi-IFE to calculate the alpha energy transport, and in this case the energy deposition uses both the LP and the BPS stopping power models. Homothetic transformations that maintain a constant implosion velocity have been used to map out the transition region between marginally-igniting and high-gain configurations. Furthermore, the results provided by the two models have been compared and it is found that – close to the ignition threshold – in order to produce the same fusion energy, the calculations performed with the BPS model require about 10% more invested energy with respect to the LP model.},
doi = {10.1140/epjd/e2017-80126-6},
journal = {European Physical Journal. D, Atomic, Molecular and Optical Physics},
number = 5,
volume = 71,
place = {United States},
year = {Thu May 25 00:00:00 EDT 2017},
month = {Thu May 25 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 1work
Citation information provided by
Web of Science

Save / Share:
  • On the first inertial-confinement-fusion ignition facility, the target capsule will be DT filled through a long, narrow tube inserted into the shell. {mu}g-scale shell perturbations {delta}m{sup '} arising from multiple, 10-50 {mu}m-diameter, hollow SiO{sub 2} tubes on x-ray-driven, ignition-scale, 1-mg capsules have been measured on a subignition device. Simulations compare well with observation, whence it is corroborated that {delta}m{sup '} arises from early x-ray shadowing by the tube rather than tube mass coupling to the shell, and inferred that 10-20 {mu}m tubes will negligibly affect fusion yield on a full-ignition facility.
  • We present on the first inertial-confinement-fusion ignition facility, the target capsule will be DT filled through a long, narrow tube inserted into the shell. μg-scale shell perturbations Δm' arising from multiple, 10–50 μm-diameter, hollow SiO 2 tubes on x-ray-driven, ignition-scale, 1-mg capsules have been measured on a subignition device. Finally, simulations compare well with observation, whence it is corroborated that Δm' arises from early x-ray shadowing by the tube rather than tube mass coupling to the shell, and inferred that 10–20 μm tubes will negligibly affect fusion yield on a full-ignition facility.
  • Within the low cost energy alternatives to carbon burning, nuclear fusion based on inertial confinement offers the earliest solution. The existing difficulties with spark (hot spot) ignition are reduced by volume ignition. Two basically different computations with different stopping power models are compared and only minor differences in the fusion gains established. An effective density-radius criterion results in comparably very high values if the strong effect of self-heat is included. {copyright} {ital 1996 American Institute of Physics.}
  • A hemispherical conically guided indirectly driven inertial confinement fusion capsule has been considered. The fast ignition of the precompressed capsule driven by one or two laser-accelerated proton beams has been numerically investigated. The energy distribution of the protons is Gaussian with a mean energy of 12 MeV and a full width at half maximum of 1 MeV. A new scheme that uses two laser-accelerated proton beams is proposed. It is found that the energy deposition of 1 kJ provided by a first proton beam generates a low-density cylindrical channel and launches a forward shock. A second proton beam, delayed bymore » a few tens of ps and driving the energy of 6 kJ, crosses the low-density channel and heats the dense shocked region where the ignition of the deuterium-tritium nuclear fuel is achieved. For the considered capsule, this new two-beam configuration reduces the ignition energy threshold to 7 kJ.« less