Using gamma-ray emission to measure areal density of inertial confinement fusion capsules

2010 ◽  
Vol 81 (10) ◽  
pp. 10D332 ◽  
Author(s):  
N. M. Hoffman ◽  
D. C. Wilson ◽  
H. W. Herrmann ◽  
C. S. Young
Keyword(s):  
Inertial Confinement Fusion ◽  
Gamma Ray ◽  
Areal Density ◽  
Inertial Confinement ◽  
Confinement Fusion ◽  
Gamma Ray Emission

Measurement of areal density in the ablators of inertial-confinement-fusion capsules via detection of ablator (n, n′γ) gamma-ray emission

2013 ◽  
Vol 20 (4) ◽  
pp. 042705 ◽  
Author(s):  
N. M. Hoffman ◽  
H. W. Herrmann ◽  
Y. H. Kim ◽  
H. H. Hsu ◽  
C. J. Horsfield ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Gamma Ray ◽  
Areal Density ◽  
Inertial Confinement ◽  
Confinement Fusion ◽  
Gamma Ray Emission

Radiation and electron thermal conduction damping of acoustic perturbations in igniting deuterium–tritium gas

2019 ◽  
Vol 85 (6) ◽  
Author(s):  
Conner D. Galloway ◽  
Robert O. Hunter ◽  
Alexander V. Valys ◽  
Gene H. McCall
Keyword(s):  
Dispersion Relation ◽  
Acoustic Waves ◽  
Thermal Conduction ◽  
Inertial Confinement Fusion ◽  
Equilibrium Configuration ◽  
Areal Density ◽  
Inertial Confinement ◽  
Confinement Fusion ◽  
Electron Thermal Conduction ◽  
Low Order

We derive a dispersion relation for the damping of acoustic waves in equi-molar deuterium–tritium (DT) gas due to radiation coupling and electron thermal conduction and discuss its significance for inertial confinement fusion (ICF) targets with high-Z shells surrounding a central DT fuel region. As the shell implodes around DT fuel in such a target, shocks and waves are transmitted through the DT gas. If the shell is perturbed due to drive non-uniformity or manufacturing imperfection, these shocks and waves may be perturbed as well, and can potentially re-perturb the shell. This can complicate calculation of shell stability and implosion asymmetry and in general make the target less robust against implosion non-uniformity. Damping of perturbations in DT gas can alleviate these complications. Also, damping of low-order modes, which is primarily due to radiation coupling, can drive the DT gas to an isobaric and isothermal ‘equilibrium’ configuration during ignition. We find that for the range of common ignition temperatures in targets with high-Z shells, $2.5\lesssim T_{ig}\lesssim 3.5$  keV, damping of low-order modes is significant for areal densities ( $\unicode[STIX]{x1D70C}r$ ) in the broad range of $0.6\lesssim \unicode[STIX]{x1D70C}r\lesssim 1.8~\text{g}~\text{cm}^{-2}$ . This suggests it is advantageous to design these targets to achieve areal densities at ignition within this range. Furthermore, we derive a simple constraint between areal density and temperature, $\unicode[STIX]{x1D70C}r=0.34T_{o}$ where $T_{o}$ is in keV, such that DT gas undergoing equilibrium ignition is optimally robust against non-uniformity.

Diagnosing inertial confinement fusion gamma ray physics (invited)

2010 ◽  
Vol 81 (10) ◽  
pp. 10D333 ◽  
Author(s):  
H. W. Herrmann ◽  
N. Hoffman ◽  
D. C. Wilson ◽  
W. Stoeffl ◽  
L. Dauffy ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Gamma Ray ◽  
Inertial Confinement ◽  
Confinement Fusion

scholarly journals Improved inertial confinement fusion gamma reaction history 12C gamma-ray signal by direct subtraction

2019 ◽  
Vol 90 (11) ◽  
pp. 113503 ◽  
Author(s):  
K. D. Meaney ◽  
Y. H. Kim ◽  
H. W. Herrmann ◽  
H. Geppert-Kleinrath ◽  
N. M. Hoffman
Keyword(s):  
Inertial Confinement Fusion ◽  
Gamma Ray ◽  
Inertial Confinement ◽  
Confinement Fusion

scholarly journals Time resolved ablator areal density during peak fusion burn on inertial confinement fusion implosions

2021 ◽  
Vol 28 (3) ◽  
pp. 032701
Author(s):  
K. D. Meaney ◽  
N. M. Hoffman ◽  
Y. Kim ◽  
H. Geppert-Kleinrath ◽  
H. W. Herrmann ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Areal Density ◽  
Inertial Confinement ◽  
Time Resolved ◽  
Confinement Fusion ◽  
Fusion Implosions

scholarly journals Review of secondary and tertiary reactions, and neutron scattering as diagnostic techniques for inertial confinement fusion targets

1991 ◽  
Vol 9 (1) ◽  
pp. 119-134 ◽  
Author(s):  
H. Azechi ◽  
M. D. Cable ◽  
R. O. Stapf
Keyword(s):  
Secondary Production ◽  
Inertial Confinement Fusion ◽  
Lower Energy ◽  
Areal Density ◽  
High Energy ◽  
Diagnostic Techniques ◽  
Inertial Confinement ◽  
Fundamental Quantity ◽  
Confinement Fusion ◽  
Scattered Neutrons

Fuel areal density, 〈ρR〉, is a fundamental quantity for ICF implosions. For current and future targets, areal densities are large enough that a variety of neutron based diagnostic techniques can be used to determine fuel 〈ρR〉. These include measurements based on the secondary production of DT neutrons from initially pure deuterium fuel and, for higher 〈ρR〉 values, techniques utilizing high energy tertiary neutrons or lower energy scattered neutrons. This paper describes these techniques and gives an overview of the current experimental status.

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