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Title: Radial transport modeling of high density deuterium plasmas in proto-MPEX with the B2.5-Eirene code

Abstract

High density (≥6 × 10 19 m –3), low temperature (2–6 eV) helicon discharges in the Prototype Material Plasma Exposure eXperiment (Proto-MPEX) are analyzed with the coupled multifluid plasma, kinetic neutrals code B2.5-Eirene. The interpretative analyses are constrained by data from multiple diagnostics, including Langmuir probes, Mach probes, filterscopes, infrared TV system, Thomson scattering, and baratrons. The objectives of the transport simulations include: investigation of the effects of heating, fueling, and plasma production; pumping, and assumed radial transport models on the calculated density and temperature distributions; plasma flow profiles and power balance. The primary objective in this report is to investigate the effects of the radial transport model in full plasma (the entire length of the plasma column in Proto-MPEX) data-constrained simulations. Results from three assumed forms of the radial transport coefficients are presented, including spatially constant, radially decreasing, and Bohm (D,χ ~T e/|B|). The results from each of the three transport coefficient sets agree qualitatively with the core (near axis) data. With the implicit T e dependence, the Bohm coefficients tend to decrease as functions of radius, although not as strongly as the centrally peaked set. The axial variation in the Bohm coefficients is largely due to the axialmore » structure of the magnetic field. Furthermore, the agreement of the simulations and the diagnostic data with the Bohm set indicates that transport in the plasma column of Proto-MPEX is dominated by Bohm diffusion.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [2];  [2]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1509588
Alternate Identifier(s):
OSTI ID: 1508677
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 26; Journal Issue: 4; 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

Citation Formats

Rapp, Juergen, Owen, Larry W., Canik, John, Lore, Jeremy D., Caneses, Juan F., Kafle, Nischal, Ray, Holly B., and Showers, Melissa A. Radial transport modeling of high density deuterium plasmas in proto-MPEX with the B2.5-Eirene code. United States: N. p., 2019. Web. doi:10.1063/1.5049808.
Rapp, Juergen, Owen, Larry W., Canik, John, Lore, Jeremy D., Caneses, Juan F., Kafle, Nischal, Ray, Holly B., & Showers, Melissa A. Radial transport modeling of high density deuterium plasmas in proto-MPEX with the B2.5-Eirene code. United States. doi:10.1063/1.5049808.
Rapp, Juergen, Owen, Larry W., Canik, John, Lore, Jeremy D., Caneses, Juan F., Kafle, Nischal, Ray, Holly B., and Showers, Melissa A. Wed . "Radial transport modeling of high density deuterium plasmas in proto-MPEX with the B2.5-Eirene code". United States. doi:10.1063/1.5049808.
@article{osti_1509588,
title = {Radial transport modeling of high density deuterium plasmas in proto-MPEX with the B2.5-Eirene code},
author = {Rapp, Juergen and Owen, Larry W. and Canik, John and Lore, Jeremy D. and Caneses, Juan F. and Kafle, Nischal and Ray, Holly B. and Showers, Melissa A.},
abstractNote = {High density (≥6 × 1019 m–3), low temperature (2–6 eV) helicon discharges in the Prototype Material Plasma Exposure eXperiment (Proto-MPEX) are analyzed with the coupled multifluid plasma, kinetic neutrals code B2.5-Eirene. The interpretative analyses are constrained by data from multiple diagnostics, including Langmuir probes, Mach probes, filterscopes, infrared TV system, Thomson scattering, and baratrons. The objectives of the transport simulations include: investigation of the effects of heating, fueling, and plasma production; pumping, and assumed radial transport models on the calculated density and temperature distributions; plasma flow profiles and power balance. The primary objective in this report is to investigate the effects of the radial transport model in full plasma (the entire length of the plasma column in Proto-MPEX) data-constrained simulations. Results from three assumed forms of the radial transport coefficients are presented, including spatially constant, radially decreasing, and Bohm (D,χ ~Te/|B|). The results from each of the three transport coefficient sets agree qualitatively with the core (near axis) data. With the implicit Te dependence, the Bohm coefficients tend to decrease as functions of radius, although not as strongly as the centrally peaked set. The axial variation in the Bohm coefficients is largely due to the axial structure of the magnetic field. Furthermore, the agreement of the simulations and the diagnostic data with the Bohm set indicates that transport in the plasma column of Proto-MPEX is dominated by Bohm diffusion.},
doi = {10.1063/1.5049808},
journal = {Physics of Plasmas},
number = 4,
volume = 26,
place = {United States},
year = {2019},
month = {4}
}

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Works referenced in this record:

A Monte Carlo computer program for the transport of energetic ions in amorphous targets
journal, August 1980