Application of an energy-dependent instrument response function to analysis of nTOF data from cryogenic DT experiments

Neutron time-of-flight (nTOF) detectors are used to diagnose the conditions present in inertial confinement fusion (ICF) experiments and basic laboratory physics experiments performed on an ICF platform. The instrument response function (IRF) of these detectors is constructed by convolution of two c...

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Bibliographic Details
Published in:Review of scientific instruments 2021-04, Vol.92 (4), p.043546-043546
Main Authors: Mohamed, Z. L., Mannion, O. M., Knauer, J. P., Forrest, C. J., Glebov, V. Yu, Stoeckl, C., Romanofsky, M. H.
Format: Article
Language:English
Subjects:
Convolution
Data analysis
Detectors
Experiments
Fusion experiments
Implosions
Inertial confinement fusion
Multiplication
Neutron energy
Neutron scattering spectra
Neutron spectra
Neutron spectroscopy
Nuclear properties
OTHER INSTRUMENTATION
Plasma confinement
Plasmas (physics)
Response functions
Scientific apparatus & instruments
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Summary:Neutron time-of-flight (nTOF) detectors are used to diagnose the conditions present in inertial confinement fusion (ICF) experiments and basic laboratory physics experiments performed on an ICF platform. The instrument response function (IRF) of these detectors is constructed by convolution of two components: an x-ray IRF and a neutron interaction response. The shape of the neutron interaction response varies with incident neutron energy, changing the shape of the total IRF. Analyses of nTOF data that span a broad range of energies must account for this energy-dependence in order to accurately infer plasma parameters and nuclear properties in ICF experiments. This work briefly reviews a matrix multiplication approach to convolution, which allows for an energy-dependent change in the shape of the IRF. This method is applied to synthetic data resembling symmetric cryogenic DT implosions to examine the effect of the energy-dependent IRF on the inferred areal density. The results of forward fits that infer ion temperatures and areal densities from nTOF data collected during cryogenic DT experiments on OMEGA are also discussed.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0043647