Comparing neutron and X-ray images from NIF implosions

Comparing neutron and X-ray images from NIF implosions

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Directly laser driven and X-radiation driven DT filled capsules differ in the relationship between neutron Wrestling - Accessories and X-ray images.Shot N110217, a directly driven DT-filled glass micro-balloon provided the first neutron images at the National Ignition Facility.As seen in implosions on the Omega laser, the neutron image can be enclosed inside time integrated X-ray images.HYDRA simulations show the X-ray image is dominated by emission from the hot glass shell while the neutron image arises from the DT fuel it encloses.In the absence of mix or jetting, X-ray images of a cryogenically layered THD fuel capsule should be dominated by emission from the hydrogen rather than the cooler plastic shell that is separated from the Bumper D-Ring hot core by cold DT fuel.

This cool, dense DT, invisible in X-ray emission, shows itself by scattering hot core neutrons.Germanium X-ray emission spectra and Ross pair filtered X-ray energy resolved images suggest that germanium doped plastic emits in the torus shaped hot spot, probably reducing the neutron yield.