Using multiple neutron time of flight detectors to determine the hot spot velocity

Hatarik, R.; Nora, R. C.; Spears, B. K.; Eckart, M. J.; Grim, G. P.; Hartouni, E. P.; Moore, A. S.; Schlossberg, D. J.

doi:10.1063/1.5039372

Title: Using multiple neutron time of flight detectors to determine the hot spot velocity

Journal Article · 16 October 2018 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/1.5039372 · OSTI ID:1545515

Hatarik, R. ^[1];

^[1]; Spears, B. K. ^[1]; Eckart, M. J. ^[1]; Grim, G. P. ^[1];

^[1]; Moore, A. S. ^[1];

^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

An important diagnostic value of a shot at the National Ignition Facility is the resultant center-of-mass motion of the imploding capsule. This residual velocity reduces the efficiency of converting laser energy into plasma temperature. A new analysis method extracts the effective hot spot motion by using information from multiple neutron time-of-flight (nToF) lines-of-sight (LoSs). This technique fits a near Gaussian spectrum to the nToF scope traces and overcomes reliance on models to relate the plasma temperature to the mean energy of the emitted neutrons. This method requires having at least four nToF LoSs. The results of this analysis will be compared to an approach where each LoS is analyzed separately and a model is employed to infer the mean energy of the emitted neutrons

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1545515

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 10 Vol. 89; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited By (3)

Velocity correction for neutron activation diagnostics at the NIF Rinderknecht, Hans G.; Bionta, R.; Grim, G. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5038734	journal	October 2018
A fused silica Cherenkov radiator for high precision time-of-flight measurement of DT γ and neutron spectra (invited) Moore, A. S.; Schlossberg, D. J.; Hartouni, E. P. Review of Scientific Instruments, Vol. 89, Issue 10 https://doi.org/10.1063/1.5039322	journal	October 2018
Neutron backscatter edge: A measure of the hydrodynamic properties of the dense DT fuel at stagnation in ICF experiments Crilly, A. J.; Appelbe, B. D.; Mannion, O. M. Physics of Plasmas, Vol. 27, Issue 1 https://doi.org/10.1063/1.5128830	journal	January 2020

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