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The hydrodynamics of the dense confining fuel shell is of great importance indefining the behaviour of the burning plasma and burn propagation regimes ofinertial confinement fusion experiments. However, it is difficult to probe dueto its low emissivity in comparison to the central fusion core. In this work,we utilise the backscattered neutron spectroscopy technique to directly measurethe hydrodynamic conditions of the dense fuel during fusion burn. Experimentaldata is fit to obtain dense fuel velocities and apparent ion temperatures.Trends of these inferred parameters with yield and velocity of the burningplasma are used to investigate their dependence on alpha heating and low modedrive asymmetry. It is shown that the dense fuel layer has an increased outwardradial velocity as yield increases showing burn has continued intore-expansion, a key signature of hotspot ignition. Comparison with analytic andsimulation models show that the observed dense fuel parameters are displayingsignatures of burn propagation into the dense fuel layer, including a rapidincrease in dense fuel apparent ion temperature with neutron yield.

Measurements of dense fuel hydrodynamics in the NIF burning plasma experiments using backscattered neutron spectroscopy