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Title: Study of argon expulsion from the post-disruption runaway electron plateau following low-Z massive gas injection in DIII-D

Abstract

Herein, a 1D radial diffusion model is developed to study the observed rapid expulsion of argon from the runaway electron plateau in the DIII-D tokamak following secondary massive low-Z (D2 or He) gas injection. The expulsion of argon is found to be caused by further cooling of the background plasma due to the added neutrals, accompanied by recombination of argon ions and greatly increased outward radial transport rate of argon (now dominantly in neutral form) out of the runaway electron beam. After argon expulsion, power loss out of the runaway electron plateau is found to be dominated by neutral transport to the wall (rather than by radiation); this result resolves the power balance discrepancy highlighted in previous work on argon expulsion out of the runaway electron plateau.

Authors:
ORCiD logo [1];  [1];  [2]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [2];  [4];  [1]; ORCiD logo [3];  [5]
  1. Univ. of California, San Diego, CA (United States)
  2. General Atomics, San Diego, CA (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. CompX Corp., Del Mar, CA (United States)
  5. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Publication Date:
Research Org.:
General Atomics, San Diego, CA (United States); Univ. of California, San Diego, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1631980
Alternate Identifier(s):
OSTI ID: 1615413; OSTI ID: 1657911
Grant/Contract Number:  
FC02-04ER54698; FG02-07ER54917; AC05-00OR22725; AC52-07NA27344; FG02-04ER54744; AC05-06OR23100
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 27; 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; Plasma temperature; Electron impact ionization; Ionization processes; Recombination reactions; Plasma confinement; Tokamaks; Runaway electrons; Energy conversion

Citation Formats

Hollmann, Eric M., Bykov, Igor, Eidietis, N. W., Herfindal, J. L., Lvovskiy, A., Moyer, R. A., Parks, P. B., Paz-Soldan, C., Pigarov, A. Yu., Rudakov, D. L., Shiraki, D., and Watkins, J. Study of argon expulsion from the post-disruption runaway electron plateau following low-Z massive gas injection in DIII-D. United States: N. p., 2020. Web. doi:10.1063/5.0003299.
Hollmann, Eric M., Bykov, Igor, Eidietis, N. W., Herfindal, J. L., Lvovskiy, A., Moyer, R. A., Parks, P. B., Paz-Soldan, C., Pigarov, A. Yu., Rudakov, D. L., Shiraki, D., & Watkins, J. Study of argon expulsion from the post-disruption runaway electron plateau following low-Z massive gas injection in DIII-D. United States. doi:https://doi.org/10.1063/5.0003299
Hollmann, Eric M., Bykov, Igor, Eidietis, N. W., Herfindal, J. L., Lvovskiy, A., Moyer, R. A., Parks, P. B., Paz-Soldan, C., Pigarov, A. Yu., Rudakov, D. L., Shiraki, D., and Watkins, J. Mon . "Study of argon expulsion from the post-disruption runaway electron plateau following low-Z massive gas injection in DIII-D". United States. doi:https://doi.org/10.1063/5.0003299. https://www.osti.gov/servlets/purl/1631980.
@article{osti_1631980,
title = {Study of argon expulsion from the post-disruption runaway electron plateau following low-Z massive gas injection in DIII-D},
author = {Hollmann, Eric M. and Bykov, Igor and Eidietis, N. W. and Herfindal, J. L. and Lvovskiy, A. and Moyer, R. A. and Parks, P. B. and Paz-Soldan, C. and Pigarov, A. Yu. and Rudakov, D. L. and Shiraki, D. and Watkins, J.},
abstractNote = {Herein, a 1D radial diffusion model is developed to study the observed rapid expulsion of argon from the runaway electron plateau in the DIII-D tokamak following secondary massive low-Z (D2 or He) gas injection. The expulsion of argon is found to be caused by further cooling of the background plasma due to the added neutrals, accompanied by recombination of argon ions and greatly increased outward radial transport rate of argon (now dominantly in neutral form) out of the runaway electron beam. After argon expulsion, power loss out of the runaway electron plateau is found to be dominated by neutral transport to the wall (rather than by radiation); this result resolves the power balance discrepancy highlighted in previous work on argon expulsion out of the runaway electron plateau.},
doi = {10.1063/5.0003299},
journal = {Physics of Plasmas},
number = 4,
volume = 27,
place = {United States},
year = {2020},
month = {4}
}

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