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Title: The Role of Helium on Ejecta Production in Copper

Abstract

The effect of helium (He) concentration on ejecta production in OFHC-Copper was investigated using Richtmyer–Meshkov Instability (RMI) experiments. The experiments involved complex samples with periodic surface perturbations machined onto the surface. Each of the four target was implanted with a unique helium concentration that varied from 0 to 4000 appm. The perturbation’s wavelengths were $λ ≈$ 65 μ m, and their amplitudes $$h_0$$ were varied to determine the wavenumber $(2 π/ λ)$ amplitude product $$kh_0$$ at which ejecta production beganfor Cu with and without He. The velocity and mass of the ejecta produced was quantified using Photon Doppler Velocimetry (PDV) and Lithium-Niobate (LN) pins, respectively. Our results show that there was an increase of 30% in the velocity at which the ejecta cloud was traveling in Copper with 4000 appm as compared to its unimplanted counterpart. Our work also shows that there was a finer cloud of ejecta particles that was not detected by the PDV probes but was detected by the early arrival of a “signal” at the LN pins. While the LN pins were not able to successfully quantify the mass produced due to it being in the solid state, they did provide information on timing. Our results show that ejecta was produced for a longer time in the 4000 appm copper.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); USDOE National Nuclear Security Administration (NNSA). Office of Defense Programs (DP)
OSTI Identifier:
1634977
Alternate Identifier(s):
OSTI ID: 1726179
Report Number(s):
LA-UR-19-32753; LA-UR-19-30934
Journal ID: ISSN 1996-1944; MATEG9
Grant/Contract Number:  
89233218CNA000001; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Materials
Additional Journal Information:
Journal Volume: 13; Journal Issue: 6; Journal ID: ISSN 1996-1944
Publisher:
MDPI
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; high strain rate strength; metals; radiation damage

Citation Formats

Fensin, Saryu Jindal, Jones, David Robert, Martinez, Daniel Tito, Lear, Calvin Robert, and Payton, Jeremy Ronald. The Role of Helium on Ejecta Production in Copper. United States: N. p., 2020. Web. https://doi.org/10.3390/ma13061270.
Fensin, Saryu Jindal, Jones, David Robert, Martinez, Daniel Tito, Lear, Calvin Robert, & Payton, Jeremy Ronald. The Role of Helium on Ejecta Production in Copper. United States. https://doi.org/10.3390/ma13061270
Fensin, Saryu Jindal, Jones, David Robert, Martinez, Daniel Tito, Lear, Calvin Robert, and Payton, Jeremy Ronald. Wed . "The Role of Helium on Ejecta Production in Copper". United States. https://doi.org/10.3390/ma13061270. https://www.osti.gov/servlets/purl/1634977.
@article{osti_1634977,
title = {The Role of Helium on Ejecta Production in Copper},
author = {Fensin, Saryu Jindal and Jones, David Robert and Martinez, Daniel Tito and Lear, Calvin Robert and Payton, Jeremy Ronald},
abstractNote = {The effect of helium (He) concentration on ejecta production in OFHC-Copper was investigated using Richtmyer–Meshkov Instability (RMI) experiments. The experiments involved complex samples with periodic surface perturbations machined onto the surface. Each of the four target was implanted with a unique helium concentration that varied from 0 to 4000 appm. The perturbation’s wavelengths were $λ ≈$ 65 μ m, and their amplitudes $h_0$ were varied to determine the wavenumber $(2 π/ λ)$ amplitude product $kh_0$ at which ejecta production beganfor Cu with and without He. The velocity and mass of the ejecta produced was quantified using Photon Doppler Velocimetry (PDV) and Lithium-Niobate (LN) pins, respectively. Our results show that there was an increase of 30% in the velocity at which the ejecta cloud was traveling in Copper with 4000 appm as compared to its unimplanted counterpart. Our work also shows that there was a finer cloud of ejecta particles that was not detected by the PDV probes but was detected by the early arrival of a “signal” at the LN pins. While the LN pins were not able to successfully quantify the mass produced due to it being in the solid state, they did provide information on timing. Our results show that ejecta was produced for a longer time in the 4000 appm copper.},
doi = {10.3390/ma13061270},
journal = {Materials},
number = 6,
volume = 13,
place = {United States},
year = {2020},
month = {3}
}

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Figures / Tables:

Figure 1 Figure 1: Target geometry with multiple surface perturbations on the copper sample used for the gun-drive experiments. The red region represents the area implanted with helium, whereas the green area shows the region used to extract data corresponding to unimplanted copper. Please note that the dimensions on the actual drawingmore » are in inches with mm in square brackets.« less

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