Title: Experimental Observations of Laser-Driven Tin Ejecta Microjet Interactions

Abstract

The study of high-velocity particle-laden flow interactions is of importance for the understanding of a wide range of natural phenomena, ranging from planetary formation to cloud interactions. Experimental observations of particle dynamics are sparse given the difficulty of generating high-velocity flows of many particles. Ejecta microjets are micron-scale jets formed by strong shocks interacting with imprinted surfaces to generate particle plumes traveling at several kilometers per second. As such, the interaction of two ejecta microjets provides a novel experimental methodology to study interacting particle streams. In this Letter, we report the first time sequences of x-ray radiography images of two interacting tin ejecta microjets taken on a platform designed for the OMEGA Extended Performance (OMEGA EP) laser. We observe that the microjets pass through each other unattenuated for the case of 11.7±3.2 GPa shock pressures and jet velocities of 2.2±0.5 km/s but show strong interaction dynamics for 116.0±6.1 GPa shock pressures and jet velocities of 6.5±0.5 km/s. Furthermore, we find that radiation-hydrodynamic simulations of the experiments are able to capture many aspects of the collisional behavior, such as the attenuation of jet velocity in the direction of propagation, but are unable to match the full spread of the strongly interactingmore » cloud.« less

Authors:

Saunders, A.  M.  ^[1];

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• Search DOE PAGES for ORCID "0000-0002-8938-0593"

Stan, C.  V.  ^[1];

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Mackay, K.  K.  ^[1];

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Morgan, B.  ^[1];

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Horwitz, J.  A. K. ^[1]; Ali, S.  J.  ^[1];

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Rinderknecht, H.  G.  ^[2];

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Haxhimali, T.  ^[1];

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Ping, Y.  ^[1];

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Najjar, F.  ^[1];

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Eggert, J.  ^[1];

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• Search DOE PAGES for ORCID "0000-0001-5730-7108"

Park, H. -S. ^[1]

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+ Show Author Affiliations

1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
2. Univ. of Rochester, NY (United States)

Publication Date:

Tue Oct 05 00:00:00 EDT 2021

Research Org.:

Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Rochester, NY (United States)

Sponsoring Org.:

USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:

1843565

Alternate Identifier(s):

OSTI ID: 1825272

Report Number(s):

LLNL-JRNL-821330
Journal ID: ISSN 0031-9007; 1033114; TRN: US2302289

Grant/Contract Number:  

AC52-07NA27344; NA0003856

Resource Type:

Accepted Manuscript

Journal Name:

Physical Review Letters

Additional Journal Information:

Journal Volume: 127; Journal Issue: 15; Journal ID: ISSN 0031-9007

Publisher:

American Physical Society (APS)

Country of Publication:

United States

Language:

English

Subject:

70 PLASMA PHYSICS AND FUSION TECHNOLOGY; dense plasma focus; high-energy-density plasmas; plasma production; laser beams; laser-foil; laser cluster; shock waves; discontinuities in plasma; Plasma production & heating by laser beams, laser-foil, laser-cluster; Shock waves & discontinuities in plasma