Title: Synchrotron radiography of Richtmyer–Meshkov instability driven by exploding wire arrays

Journal Article · · Physics of Fluids
DOI: https://doi.org/10.1063/5.0144839 · OSTI ID:2565091

We present a new technique for the investigation of shock-driven hydrodynamic phenomena in gases, liquids, and solids in arbitrary geometries. The technique consists of a pulsed power-driven resistive wire array explosion in combination with multi-MHz synchrotron radiography. Compared to commonly used techniques, it offers multiple advantages: (1) the shockwave geometry can be shaped to the requirements of the experiment, (2) the pressure (P > 300 MPa) generated by the exploding wires enables the use of liquid and solid hydrodynamic targets with well-characterized initial conditions (ICs), (3) the multi-MHz radiography enables data acquisition to occur within a single experiment, eliminating uncertainties regarding repeatability of the ICs and subsequent dynamics, and (4) the radiographic measurements enable estimation of compression ratios from the x-ray attenuation. In addition, the use of a synchrotron x-ray source allows the hydrodynamic samples to be volumetrically characterized at a high spatial resolution with synchrotron-based microtomography. This experimental technique is demonstrated by performing a planar Richtmyer–Meshkov instability (RMI) experiment on an aerogel–water interface characterized by Atwood number A0∼−0.8 and Mach number M∼1.5. The qualitative and quantitative features of the experiment are discussed, including the energy deposition into the exploding wires, shockwave generation, compression of the interface, startup phase of the instability, and asymptotic growth consistent with Richtmyer's impulsive theory. Additional effects unique to liquids and solids—such as cavitation bubbles caused by rarefaction flows or initial jetting due to small perturbations—are observed. It is also demonstrated that the technique is not shape dependent by driving a cylindrically convergent RMI experiment.

Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
European Synchrotron Radiation Facility (ESRF); USDOE; USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0003764
OSTI ID:
2565091
Journal Information:
Physics of Fluids, Journal Name: Physics of Fluids Journal Issue: 4 Vol. 35; ISSN 1070-6631
Publisher:
American Institute of PhysicsCopyright Statement
Country of Publication:
United States
Language:
English

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