Deuteron breakup induced by 14-MeV neutrons from inertial confinement fusion

Forrest, C.; Deltuva, A.; Schröder, W. U.; Voinov, A.; Knauer, J.P.; Campbell, E. M.; Collins, G. W.; Glebov, V. Yu.; Mannion, O. M.; Mohamed, Z. L.; Radha, P. B.; Regan, S. P.; Sangster, T. C.; Stoeckl, C.

doi:10.1103/physrevc.100.034001

Cited by 10 publications

(2 citation statements)

References 27 publications

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“…The effects of scattering ion velocities can be included for elastic processes using the method outlined in Crilly et al 24 These ion velocity effects are particularly important for the spectral shape of the backscatter edges. It is worth noting that most of the scattering interactions have been well measured, 25,26 but this is not the case for n(T,2n)D. Models disagree on the cross section at 14 MeV (Refs. 19 and 27) and experimental data are limited 28 -this prompts further theoretical and experimental effort to reduce these uncertainties.…”

Section: Spectral Modelmentioning

confidence: 99%

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The effect of areal density asymmetries on scattered neutron spectra in ICF implosions

et al. 2021

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Scattered neutron spectroscopy is a diagnostic technique commonly used to measure areal density in inertial confinement fusion experiments. Deleterious areal density asymmetries modify the shape of the scattered neutron spectrum. In this work, a novel analysis is developed, which can be used to fit the shape change. This will allow experimental scattered neutron spectroscopy to directly infer the amplitude and mode of the areal density asymmetries, with little sensitivity to confounding factors that affect other diagnostics for areal density. The model is tested on spectra produced by a neutron transport calculation with both isotropic and anisotropic primary fusion neutron sources. Multiple lines of sight are required to infer the areal density distribution over the whole sphere-we investigate the error propagation and optimal detector arrangement associated with the inference of mode 1 asymmetries.

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Section: Spectral Modelmentioning

confidence: 99%

“…For this range, fractional errors in inelastic cross sections of $10% (Ref. 26) produce $4% error in areal density inference.…”

Section: Fig 2 (A)mentioning

confidence: 99%

The effect of areal density asymmetries on scattered neutron spectra in ICF implosions

et al. 2021

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Neutron backscatter edge: A measure of the hydrodynamic properties of the dense DT fuel at stagnation in ICF experiments

et al. 2020

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The kinematic lower bound for the single scattering of neutrons produced in DT fusion reactions produces a backscatter edge in the measured neutron spectrum. The energy spectrum of backscattered neutrons is dependent on the scattering ion velocity distribution. As the neutrons preferentially scatter in the densest regions of the capsule, the neutron backscatter edge presents a unique measurement of the hydrodynamic conditions in the dense DT fuel. It is shown that the spectral shape of the edge is determined by the scattering rate weighted fluid velocity and temperature of the stagnating capsule. In order to fit the neutron spectrum, a model for the various backgrounds around the backscatter edge is developed and tested on synthetic data produced from hydrodynamic simulations of OMEGA implosions. It is determined that the analysis could be utilised on current ICF experiments in order to measure the dense fuel properties.

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A generalized forward fit for neutron detectors with energy-dependent response functions

Mohamed

Mannion

Hartouni

et al. 2020

Journal of Applied Physics

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To date, most of the analysis of neutron time-of-flight data from inertial confinement fusion experiments has focused on the relatively small range of energies corresponding to the primary neutrons from deuterium–deuterium and deuterium–tritium fusion and has, therefore, employed instrument response functions (IRFs) corresponding to monoenergetic 2.45-MeV or 14.03-MeV neutrons. For the analysis of time-of-flight signals corresponding to broader ranges of neutron energies, accurate treatment of the data requires the use of an energy-dependent IRF. This work describes interpolation of the IRF for neutrons of arbitrary energy, construction of an energy-dependent IRF, and application of this IRF in a forward fit via matrix multiplication. As an example of the application of this method, an analysis of synthetic data relevant to tritium–tritium fusion experiments at the Omega Laser Facility is discussed. This example is used to illustrate the differences between a forward fit that uses an energy-dependent IRF and a forward fit that uses a monoenergetic IRF. Use of the energy-dependent IRF is shown to result in accurate inference of the fit parameters of interest.

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Deuteron breakup induced by 14-MeV neutrons from inertial confinement fusion

Cited by 10 publications

References 27 publications

The effect of areal density asymmetries on scattered neutron spectra in ICF implosions

The effect of areal density asymmetries on scattered neutron spectra in ICF implosions

Neutron backscatter edge: A measure of the hydrodynamic properties of the dense DT fuel at stagnation in ICF experiments

A generalized forward fit for neutron detectors with energy-dependent response functions

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