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Title: Study of lithium vapor flow in a detached divertor using DSMC code

Abstract

Here, a detached divertor is predicted to be necessary to handle the heat fluxes of a demonstration fusion power plant. The lithium vapor box divertor localizes dense lithium vapor to cause stable detachment. This localization is formed by local evaporation and nearby condensation. We provide a simulation of lithium vapor flow using the SPARTA Direct Simulation Monte Carlo (DSMC) code. Simulations of a baffled vapor box divertor’s lithium mass flow are within a factor of two of an ideal-gas choked nozzle flow calculation. Lithium flow and density within each chamber are given for a 200 MW power input Demo-scaled vapor-box example configuration. We find the lithium exits the baffles of this configuration at a rate of ~4 g/s. This should be acceptable since ionization of ~60 g/s of lithium is taking place to cause detachment [3]. A simple model of the Fusion National Science Facility (FNSF) divertor plasma is also explored. We compare our simulations using SPARTA to a similar UEDGE simulation, showing the lithium ionizations rates can be emulated to a reasonable degree. The addition of baffles causes a decrease in far SOL ionization by a factor of eight. Changes in detachment front position over a range of 19cmmore » can cause more than a factor of 18 increase in ionization rate, indicating detachment location is highly stable to variations in heatflux. Unbaffled results are more modest, but nonetheless promising with a factor of six change in ionization over the same region.« less

Authors:
ORCiD logo [1];  [1];  [1];  [2];  [2]
  1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  2. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1503326
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Volume: 19; Journal Issue: C; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Divertor; Lithium; DSMC; Detachment

Citation Formats

Emdee, E. D., Goldston, R. J., Schwartz, J. A., Rensink, M. E., and Rognlien, T. D.. Study of lithium vapor flow in a detached divertor using DSMC code. United States: N. p., 2019. Web. doi:10.1016/j.nme.2019.01.032.
Emdee, E. D., Goldston, R. J., Schwartz, J. A., Rensink, M. E., & Rognlien, T. D.. Study of lithium vapor flow in a detached divertor using DSMC code. United States. doi:10.1016/j.nme.2019.01.032.
Emdee, E. D., Goldston, R. J., Schwartz, J. A., Rensink, M. E., and Rognlien, T. D.. Thu . "Study of lithium vapor flow in a detached divertor using DSMC code". United States. doi:10.1016/j.nme.2019.01.032. https://www.osti.gov/servlets/purl/1503326.
@article{osti_1503326,
title = {Study of lithium vapor flow in a detached divertor using DSMC code},
author = {Emdee, E. D. and Goldston, R. J. and Schwartz, J. A. and Rensink, M. E. and Rognlien, T. D.},
abstractNote = {Here, a detached divertor is predicted to be necessary to handle the heat fluxes of a demonstration fusion power plant. The lithium vapor box divertor localizes dense lithium vapor to cause stable detachment. This localization is formed by local evaporation and nearby condensation. We provide a simulation of lithium vapor flow using the SPARTA Direct Simulation Monte Carlo (DSMC) code. Simulations of a baffled vapor box divertor’s lithium mass flow are within a factor of two of an ideal-gas choked nozzle flow calculation. Lithium flow and density within each chamber are given for a 200 MW power input Demo-scaled vapor-box example configuration. We find the lithium exits the baffles of this configuration at a rate of ~4 g/s. This should be acceptable since ionization of ~60 g/s of lithium is taking place to cause detachment [3]. A simple model of the Fusion National Science Facility (FNSF) divertor plasma is also explored. We compare our simulations using SPARTA to a similar UEDGE simulation, showing the lithium ionizations rates can be emulated to a reasonable degree. The addition of baffles causes a decrease in far SOL ionization by a factor of eight. Changes in detachment front position over a range of 19cm can cause more than a factor of 18 increase in ionization rate, indicating detachment location is highly stable to variations in heatflux. Unbaffled results are more modest, but nonetheless promising with a factor of six change in ionization over the same region.},
doi = {10.1016/j.nme.2019.01.032},
journal = {Nuclear Materials and Energy},
number = C,
volume = 19,
place = {United States},
year = {2019},
month = {3}
}

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