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

TL;DR

This paper introduces a method to analyze neutron backscatter edges in ICF experiments, providing a new way to measure the hydrodynamic properties of dense DT fuel at stagnation.

Contribution

It develops a spectral model for neutron backscatter edges and demonstrates its potential to measure dense fuel conditions in current ICF experiments.

Findings

Spectral shape depends on fluid velocity and temperature.

Model fits synthetic data from hydrodynamic simulations.

Method can be applied to real ICF neutron spectra.

Abstract

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.