The role of helium on ejecta production in copper

Saryu Fensin; David Jones; Daniel Martinez; Calvin Lear; Jeremy Payton

doi:10.3390/ma13061270

The role of helium on ejecta production in copper

Saryu Fensin, David Jones, Daniel Martinez, Calvin Lear, Jeremy Payton

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

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 μm, and their amplitudes h₀ were varied to determine the wavenumber (2π/λ) amplitude product kh₀ 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.

Original language	English
Article number	1270
Journal	Materials
Volume	13
Issue number	6
DOIs	https://doi.org/10.3390/ma13061270
State	Published - Mar 1 2020
Externally published	Yes

Funding

Los Alamos National Laboratory is operated by LANS, LLC, for the NNSA and the U. S Department of Energy under contract DE-AC52-06NA25396. Funding was provided by Office of Experimental Science. We would also like to thank Bill Blumenthal, Rusty Gray and Peter Hosemann for helpful discussions. We also wish to acknowledge Derek Schmidt and John Martinez for machining the targets. The authors would like to acknowledge the assistance of O. Toader, F. Naab, and T. Kubley of Michigan Ion Beam Laboratory Funding: Los Alamos National Laboratory is operated by LANS, LLC, for the NNSA and the U.S Department of Energy under contract DE-AC52-06NA25396. Funding was provided by Office of Experimental Science.

Keywords

High strain rate strength
Metals
Radiation damage

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10.3390/ma13061270

Cite this

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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 μm, and their amplitudes h0 were varied to determine the wavenumber (2π/λ) amplitude product kh0 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.",

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N2 - 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 μm, and their amplitudes h0 were varied to determine the wavenumber (2π/λ) amplitude product kh0 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.

AB - 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 μm, and their amplitudes h0 were varied to determine the wavenumber (2π/λ) amplitude product kh0 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.

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The role of helium on ejecta production in copper

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