Experimental characterization of a transition from collisionless to collisional interaction between head-on-merging supersonic plasma jetsa)

Moser, Auna L.; Hsu, Scott C.

doi:10.1063/1.4920955

Title: Experimental characterization of a transition from collisionless to collisional interaction between head-on-merging supersonic plasma jets^a)

Journal Article · Fri May 01 00:00:00 EDT 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4920955· OSTI ID:1193441

Moser, Auna L. ^[1];

^[1]

Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

We present results from experiments on the head-on merging of two supersonic plasma jets in an initially collisionless regime for the counter-streaming ions [A. L. Moser & S. C. Hsu, Phys. Plasmas, submitted (2014)]. The plasma jets are of either an argon/impurity or hydrogen/impurity mixture and are produced by pulsed-power-driven railguns. Based on time- and space-resolved fast-imaging, multi-chord interferometry, and survey-spectroscopy measurements of the overlapping region between the merging jets, we observe that the jets initially interpenetrate, consistent with calculated inter-jet ion collision lengths, which are long. As the jets interpenetrate, a rising mean-charge state causes a rapid decrease in the inter-jet ion collision length. Finally, the interaction becomes collisional and the jets stagnate, eventually producing structures consistent with collisional shocks. These experimental observations can aid in the validation of plasma collisionality and ionization models for plasmas with complex equations of state.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1193441

Alternate ID(s):: OSTI ID: 1228233

Report Number(s):: LA-UR-14-28942; PHPAEN

Journal Information:: Physics of Plasmas, Vol. 22, Issue 5; ISSN 1070-664X

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 23 works

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