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|a Simulations of divertor plasmas with inverse sheaths
|h [electronic resource]
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|a Washington, D.C. :
|b United States. Department of Energy. Office of Science ;
|a Oak Ridge, Tenn. :
|b Distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
|c 2020.
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|a Size: Article No. 092505 :
|b digital, PDF file.
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|a text
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|a Published through Scitech Connect.
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|a 09/08/2020.
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|a "Journal ID: ISSN 1070-664X."
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|a ": US2210912."
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|a Masline, R. ; Smirnov, R. D. ; Krasheninnikov, S. I. ;
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|a Univ. of California, San Diego, CA (United States)
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|a The effect of strong electron emission from material surfaces has been proposed to form an ?inverse sheath?: a region with a positive potential relative to the near-wall plasma which prevents the flow of ions to the wall [M. D. Campanell, ?Negative plasma potential relative to electronemitting surfaces,? Phys. Rev. E. 88, 033103 (2013); M. D. Campanell and M. V. Umansky, ?Strongly emitting surfaces unable to float below plasma potential,? Phys. Rev. Lett. 116, 1?5 (2016); M. D. Campanell and G. R. Johnson, ?Thermionic cooling of the target plasma to a sub-ev temperature,? Phys. Rev. Lett. 122, 1?5 (2019)]. We assess the viability of this regime in a tokamak device using the 2D edge plasma transport code UEDGE [T. Rognlien <em>et al</em>., ?A fully implicit, time dependent 2-D fluid code for modeling tokamak edge plasmas,? J. Nucl. Mater. 196?198, 347?351 (1992)]. Since the UEDGE code does not consider the sheath region directly, we apply boundary conditions at the divertor targets which emulate the physics of both ?standard? and ?inverse? sheath regimes [R. Masline <em>et al</em>., ?Influence of the inverse sheath on divertor plasma performance in tokamak edge plasma simulations,? Contrib. Plasma Phys. 60, e201900097 (2020)]. Using these boundary conditions, we perform scoping studies to assess plasma parameters near the target by varying the density at the core-edge interface. We observe a smooth transition in the resultant profiles of plasma parameters for the standard sheath, and a bifurcation across the simulation set for plasmas with an inverse sheath. The cause of this bifurcation is assessed by performing the parameter scan both with and without impurity radiation; we observe that the bifurcation persists in both cases, indicating that this bifurcation is caused by plasma recombination.
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|b FG02-04ER54739.
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|a 70 plasma physics and fusion technology
|2 local.
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|a Physics
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|a Plasma material interactions
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|a Tokamaks
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|a Plasma sheaths
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|a Fusion reactors
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|a Plasma physics and fusion technology
|2 local.
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|a United States.
|b Department of Energy.
|b Office of Science.
|4 spn.
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|a United States.
|b Department of Energy.
|b Chicago Operations Office.
|f res.
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|a United States.
|b Department of Energy.
|b Office of Scientific and Technical Information
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|u https://www.osti.gov/servlets/purl/1800219
|z Full Text (via OSTI)
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|a .b128291370
|b 02-28-23
|c 12-08-22
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|b 12-08-22
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|p Can circulate
|a University of Colorado Boulder
|b Online
|c Online
|d Online
|e E 1.99:1800219
|h Superintendent of Documents classification
|i web
|n 1
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