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Title: Time-dependent modeling of coupled plasma-wall dynamics

Abstract

Effects of dynamic wall outgassing on divertor plasma during an ELM-like heat pulse are modelled using newly coupled edge plasma code UEDGE and all reaction-diffusion code FACE. Different divertor regimes are simulated depending on the degree of the plasma detachment. It is shown that hydrogen outgassing from the divertor target plate induced by ELM pulse in the semi-detached regime can trigger deep plasma detachment. The induced detachment does not spontaneously reverse after the pulse due to ineffective implantation of low energy plasma hydrogen in the target material. Furthermore, we demonstrate that plasma neutrals play essential role in heat transport in a detached divertor. The modelled hydrogen dynamics in the wall material demonstrates that the heat pulse leads to enhanced hydrogen transport toward the wall bulk.

Authors:
ORCiD logo [1];  [1];  [2]
  1. Univ. of California, San Diego, CA (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Univ. of California, San Diego, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
OSTI Identifier:
1603069
Alternate Identifier(s):
OSTI ID: 1603188
Grant/Contract Number:  
SC0018302
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 27; Journal Issue: 3; 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

Smirnov, R. D., Krasheninnikov, S. I., and Umansky, M. V. Time-dependent modeling of coupled plasma-wall dynamics. United States: N. p., 2020. Web. doi:10.1063/1.5140183.
Smirnov, R. D., Krasheninnikov, S. I., & Umansky, M. V. Time-dependent modeling of coupled plasma-wall dynamics. United States. https://doi.org/10.1063/1.5140183
Smirnov, R. D., Krasheninnikov, S. I., and Umansky, M. V. Thu . "Time-dependent modeling of coupled plasma-wall dynamics". United States. https://doi.org/10.1063/1.5140183. https://www.osti.gov/servlets/purl/1603069.
@article{osti_1603069,
title = {Time-dependent modeling of coupled plasma-wall dynamics},
author = {Smirnov, R. D. and Krasheninnikov, S. I. and Umansky, M. V.},
abstractNote = {Effects of dynamic wall outgassing on divertor plasma during an ELM-like heat pulse are modelled using newly coupled edge plasma code UEDGE and all reaction-diffusion code FACE. Different divertor regimes are simulated depending on the degree of the plasma detachment. It is shown that hydrogen outgassing from the divertor target plate induced by ELM pulse in the semi-detached regime can trigger deep plasma detachment. The induced detachment does not spontaneously reverse after the pulse due to ineffective implantation of low energy plasma hydrogen in the target material. Furthermore, we demonstrate that plasma neutrals play essential role in heat transport in a detached divertor. The modelled hydrogen dynamics in the wall material demonstrates that the heat pulse leads to enhanced hydrogen transport toward the wall bulk.},
doi = {10.1063/1.5140183},
journal = {Physics of Plasmas},
number = 3,
volume = 27,
place = {United States},
year = {2020},
month = {3}
}

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