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hsu_talk_reduced.pdf2014-08-09 08:10:26Scott Hsu

Laboratory experiments on colliding supersonic plasma jets: a validation opportunity for plasma collisionality and shock-handling physics models

Author: Scott Hsu
Requested Type: Poster Only
Submitted: 2014-05-28 12:48:31

Co-authors: A. L. Moser, E. C. Merritt, C. S. Adams, J. P. Dunn

Contact Info:
MS E526
Los Alamos, NM   87545

Abstract Text:
We have conducted laboratory experiments on colliding supersonic plasma jets in oblique [1,2] and head-on merging [3] geometries, spanning a range of inter-jet plasma collisionalities. In contrast to most contemporary experiments on colliding supersonic plasmas, which are largely based on mm-scale laser- or wire-array-driven plasmas, our colliding jets have a ~10-cm spatial scale with dynamics occurring over a ~10-┬Ás time scale, allowing for unprecedented spatial and temporal resolution in diagnostic measurements of the jet interaction and shock formation dynamics. I will present experimental results on (i) oblique plasma jet merging in a collisional regime, with intriguing CCD camera images that we have shown to be consistent with collisional oblique shock formation [1,2], and (ii) head-on plasma jet merging in an initially collisionless regime for inter-jet ions that transitions to collisional stagnation due to a dynamically rising mean-charge-state [3] (in our argon/impurity plasmas). These measurements offer a rare opportunity for benchmarking and validating plasma collisionality and shock-handling models in the presence of complex equation of state.
[1] E. C. Merritt, A. L. Moser, S. C. Hsu et al., Phys. Rev. Lett. 111, 085003 (2013).
[2] E. C. Merritt, A. L. Moser, S. C. Hsu et al., Phys. Plasmas 21, 055703 (2014).
[3] A. L. Moser and S. C. Hsu, "Observation of ionization-mediated transition from collisionless interpenetration to collisional stagnation during merging of two supersonic plasmas," submitted (2014).

Characterization: 2.0,4.0

Please place in a different session than my other poster, if possible.

Workshop on Exploratory Topics in Plasma and Fusion Research (EPR) and US-Japan Compact Torus (CT) Workshop
August 5-8, 2014
Madison, Wisconsin

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