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Title: Experimental study of ion heating in obliquely merging hypersonic plasma jets

Abstract

In this study, we measure ion temperature evolution of collisional plasma shocks and colliding supersonic plasma flows across a range of species (Ar, Kr, Xe, and N), Mach numbers, and collisionalities. Shocks are formed via the collision of discrete plasma jets relevant to plasma-jet-driven magneto-inertial fusion (PJMIF). We observe nearly classical ion shock heating and ion-electron equilibration, with peak temperatures attained consistent with collisional shock heating. Additionally, we observe cases where this heating occurs in a smooth merged structure with reduced density gradients due to significant intepenetration of the plasma jets. In application to PJMIF liners, we find that Mach number degradation due to ion shock heating will likely not be significant at the typical full-scale conditions proposed, and that a degree of interpenetration may be an attractive condition for PJMIF and similar approaches which seek to form uniform merged structures from discrete supersonic plasma jets.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [3]
+ Show Author Affiliations
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Voss Scientific, Albuquerque, NM (United States)
  3. Univ. of New Mexico, Albuquerque, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1570647
Report Number(s):
LA-UR-19-23922
Journal ID: ISSN 1070-664X; TRN: US2100250
Grant/Contract Number:  
89233218CNA000001; AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 8; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; MIF; PJMIF; Shock; Plasma Shock

Citation Formats

Langendorf, Samuel J., Yates, Kevin Colligan, Hsu, Scott C., Thoma, Carsten, and Gilmore, Mark A. Experimental study of ion heating in obliquely merging hypersonic plasma jets. United States: N. p., 2019. Web. doi:10.1063/1.5108727.
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Langendorf, Samuel J., Yates, Kevin Colligan, Hsu, Scott C., Thoma, Carsten, & Gilmore, Mark A. Experimental study of ion heating in obliquely merging hypersonic plasma jets. United States. https://doi.org/10.1063/1.5108727
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Langendorf, Samuel J., Yates, Kevin Colligan, Hsu, Scott C., Thoma, Carsten, and Gilmore, Mark A. Tue . "Experimental study of ion heating in obliquely merging hypersonic plasma jets". United States. https://doi.org/10.1063/1.5108727. https://www.osti.gov/servlets/purl/1570647.
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@article{osti_1570647,
title = {Experimental study of ion heating in obliquely merging hypersonic plasma jets},
author = {Langendorf, Samuel J. and Yates, Kevin Colligan and Hsu, Scott C. and Thoma, Carsten and Gilmore, Mark A.},
abstractNote = {In this study, we measure ion temperature evolution of collisional plasma shocks and colliding supersonic plasma flows across a range of species (Ar, Kr, Xe, and N), Mach numbers, and collisionalities. Shocks are formed via the collision of discrete plasma jets relevant to plasma-jet-driven magneto-inertial fusion (PJMIF). We observe nearly classical ion shock heating and ion-electron equilibration, with peak temperatures attained consistent with collisional shock heating. Additionally, we observe cases where this heating occurs in a smooth merged structure with reduced density gradients due to significant intepenetration of the plasma jets. In application to PJMIF liners, we find that Mach number degradation due to ion shock heating will likely not be significant at the typical full-scale conditions proposed, and that a degree of interpenetration may be an attractive condition for PJMIF and similar approaches which seek to form uniform merged structures from discrete supersonic plasma jets.},
doi = {10.1063/1.5108727},
journal = {Physics of Plasmas},
number = 8,
volume = 26,
place = {United States},
year = {Tue Aug 13 00:00:00 EDT 2019},
month = {Tue Aug 13 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1063/1.5108727
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Cited by: 3 works
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Figures / Tables:

FIG. 2 FIG. 2: Example of normalized raw, smoothed, and and time-shifted photodiode data for deduction of jet velocity of shot 1769. Time shift was found based on median time difference between an array of levels spanning 10% - 90% of the leading edge.
All figures and tables (13 total)
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    Formation of transient high-β plasmas in a magnetized, weakly collisional regime
    journal, January 2021

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      Figures / Tables found in this record:

      FIG. 2 (p. 4)figure
      FIG. 3 (p. 5)figure
      FIG. 4 (p. 6)figure
      FIG. 5 (p. 6)figure
      TABLE 1 (p. 6)table
      FIG. 6 (p. 7)figure
      FIG. 7 (p. 8)figure
      FIG. 8 (p. 8)figure
      FIG. 9 (p. 9)figure
      TABLE II (p. 10)table
      FIG. 1 (p. 14)figure
      FIG.10 (p. 32)figure
      Fig. 11 (p. 34)figure
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