Abstract
The formation of Z-pinch dynamic hohlraums (ZPDHs) can be regarded as a two-phase process consisting of the energy thermalization and the shock propagation. Once the Z-pinch plasma impacts onto the convertor, the energy thermalization begins with two shocks generated counter-propagating in the Z-pinch plasma and the convertor, and ends when all the Z-pinch plasma has been subjected to the shock. Focused on the energy thermalization process, a simple model is built to investigate the interaction between the Z-pinch plasma and the convertor, and the matching mass ratio between them can be found by optimizing the matter temperature. The matching mass ratio is affected little by the convertor radius but sensitive to the initial mass and radius of the Z-pinch plasma. The matching relationship at higher drive current is also investigated and it is found that the matching mass ratio is mainly determined by the initial radius of the Z-pinch plasma. The application of the model to the PTS facility brings some suggestions to optimize the ZPDH.
Highlights
A fast Z-pinch is a powerful X-ray source by imploding a cylindrical wire-array with a 100 ns MA-level pulse current.[1]
The formation of Z-pinch dynamic hohlraums (ZPDHs) could be simplified as a two-phase process consisting of the energy thermalization and shock propagation.[6,20]
In the Z-pinch dynamic hohlraum experiment there, a current pulse rising to approximately 20 MA in 100 ns was delivered to a 1-cm-long tungsten nested wire array, with the outer array of 240 wires at the initial radius of 2 cm and the inner array of 120 wires at the initial radius of 1 cm
Summary
A fast Z-pinch is a powerful X-ray source by imploding a cylindrical wire-array with a 100 ns MA-level pulse current.[1]. The ZPDH is a more efficient hohlraum which is typically produced after the wire-array Z-pinch plasma impacts onto a low density foam convertor embedded on the axis of the wire-array.[18]. The collision between the Z-pinch plasma and the convertor in the ZPDH generates two shocks propagating through both the Z-pinch plasma and the convertor These shocks heat both the Z-pinch plasma and the convertor material to high temperatures, which emit thermal X-rays and produce a symmetrical radiation environment. Detailed numerical results show that the impact takes place in a local interaction region near the boundary of the Z-pinch plasma and the convertor, and the impact and the corresponding energy thermalization last several nanoseconds.[6,20,21] Focused on the energy thermalization process, a simple model is built in the work to investigate the impact interaction between the Z-pinch plasma and the convertor.
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