Analysis of Radiation-Driven Jetting Experiments on NOVA and Z

Physics – Condensed Matter

Scientific paper

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Scientific paper

We have used the shock-physics code ALEGRA to study radiation-driven jetting experiments on both NOVA and Z. Emphasis is on validating the numerical techniques with NOVA measurements, and examining the feasibility of scaling up those experiments by an order of magnitude for the Z-pinch facility. The jetting problem involves a 100-mm-scale aluminum pin surrounded by a gold washer that was exposed to a 5-ns x-ray load from a NOVA hohlraum. The configuration leads to jetting phenomena along the cylindrical axis of symmetry. This setup has been scaled up physically by an order of magnitude for qualitatively similar experiments on the Z-pinch machine using a nominal 50-ns-wide radiation pulse. Post-processing of the ALEGRA output using the spectral analysis code SPECT3D shows that diagnostics using the Z-Beamlet Backlighter are feasible with this larger geometry. Comparisons with the NOVA results show that the simulations represent the actual phenomena well, and give confidence in the accuracy of the calculations for the proposed Z experiments.

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