Bulletin of the American Physical Society
64th Annual Meeting of the APS Division of Plasma Physics
Volume 67, Number 15
Monday–Friday, October 17–21, 2022; Spokane, Washington
Session QI02: Pulsed Power Driven Fusion and HED Diagnostics
3:00 PM–5:00 PM,
Wednesday, October 19, 2022
Room: Ballroom 100 B
Chair: Eric Harding, Sandia National Lab
Abstract: QI02.00003 : Single-shot 256-frame Radiography Measurements of Pulsed Power Driven Instability Growth in Converging and Diverging Geometries*
4:00 PM–4:30 PM
Presenter:
Jergus Strucka
(Imperial College London)
Authors:
Jergus Strucka
(Imperial College London)
Daniel Maler
(Israel Institute of Technology)
Savva P Theocharous
(Imperial College London)
Yifan Yao
(Imperial College London)
Sergey Efimov
(Israel Institute of Technology)
Alexander Rack
(European Synchrotron Radiation Facility)
Bratislav Lukic
(European Synchrotron Radiation Facility)
Yakov Krasik
(Technion - Israel Institute of Technology)
Jeremy P Chittenden
(Imperial College London)
Simon N Bland
(Blackett Lab)
In this presentation, we describe a novel technique to obtain 256 radiographs (176ns apart, 8μm resolution, 100ps exposure) of hydrodynamic evolution in a single shot. We use a compact pulsed power driver (35kA, 1000ns rise time) to resistively explode underwater metallic assemblies and drive convergent, divergent, or planar shocks at multi-km/s speeds. The driver is coupled to the X-ray phase contrast imaging (E~30keV) of the European Synchrotron Radiation Facility.
Initially, we studied the axial density striations induced by the electrothermal instability (ETI) in exploding wires. Here we measured the interaction of a cylindrically convergent shock travelling from the surrounding water into low density plasma of an exploding wire (negative Atwood number), revealing the wavelengths of the density perturbations in the wire plasma. The ETI dynamics were used to control the density perturbations in the plasma by changing the wire material (Al, Ag, Cu, Mo, W). The results of the experiments agree with the ETI theory and provide a test for the conductivity and EoS models used in MHD simulations.
We will also discuss the design and results of the thin-layer Richtmyer-Meshkov instability measurements, scaling of the experiments, and results from simulations performed in the GORGON MHD code.
* Supported by First Light Fusion, ESRF user programme HC-4455 & HC-4679, DOE Award DE-NA0003764, and Israel Science Foundation Grant 492/18
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