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Title: Design and measurement methods for a lithium vapor box similarity experiment

Abstract

Here, the lithium vapor box divertor is a concept for handling the extreme divertor heat fluxes in magnetic fusion devices. In a baffled slot divertor, plasma interacts with a dense cloud of Li vapor which radiates and cools the plasma, leading to recombination and detachment. Before testing on a tokamak, the concept should be validated: we plan to study detachment and heat redistribution by a Li vapor cloud in laboratory experiments. Mass changes and temperatures are measured to validate a direct simulation Monte Carlo model of neutral Li. The initial experiment involves a 5 cm diameter steel box containing 10 g of Li held at 650 °C as vapor flows out a wide nozzle into a similarly sized box at a lower temperature. Diagnosis is made challenging by the required material compatibility with lithium vapor. Vapor pressure is a steep function of temperature, so to validate mass flow models to within 10%, absolute temperature to within 4.5 K is required. The apparatus is designed to be used with an analytical balance to determine mass transport. Details of the apparatus and methods of temperature and mass flow measurements are presented.

Authors:
ORCiD logo [1];  [1];  [2];  [1]
  1. Princeton Univ., Princeton, NJ (United States)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1465999
Alternate Identifier(s):
OSTI ID: 1463940
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 89; Journal Issue: 10; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; lithium; divertor; detachment; vapor

Citation Formats

Schwartz, J. A., Emdee, E. D., Jaworski, M. A., and Goldston, R. J. Design and measurement methods for a lithium vapor box similarity experiment. United States: N. p., 2018. Web. doi:10.1063/1.5039406.
Schwartz, J. A., Emdee, E. D., Jaworski, M. A., & Goldston, R. J. Design and measurement methods for a lithium vapor box similarity experiment. United States. https://doi.org/10.1063/1.5039406
Schwartz, J. A., Emdee, E. D., Jaworski, M. A., and Goldston, R. J. Fri . "Design and measurement methods for a lithium vapor box similarity experiment". United States. https://doi.org/10.1063/1.5039406. https://www.osti.gov/servlets/purl/1465999.
@article{osti_1465999,
title = {Design and measurement methods for a lithium vapor box similarity experiment},
author = {Schwartz, J. A. and Emdee, E. D. and Jaworski, M. A. and Goldston, R. J.},
abstractNote = {Here, the lithium vapor box divertor is a concept for handling the extreme divertor heat fluxes in magnetic fusion devices. In a baffled slot divertor, plasma interacts with a dense cloud of Li vapor which radiates and cools the plasma, leading to recombination and detachment. Before testing on a tokamak, the concept should be validated: we plan to study detachment and heat redistribution by a Li vapor cloud in laboratory experiments. Mass changes and temperatures are measured to validate a direct simulation Monte Carlo model of neutral Li. The initial experiment involves a 5 cm diameter steel box containing 10 g of Li held at 650 °C as vapor flows out a wide nozzle into a similarly sized box at a lower temperature. Diagnosis is made challenging by the required material compatibility with lithium vapor. Vapor pressure is a steep function of temperature, so to validate mass flow models to within 10%, absolute temperature to within 4.5 K is required. The apparatus is designed to be used with an analytical balance to determine mass transport. Details of the apparatus and methods of temperature and mass flow measurements are presented.},
doi = {10.1063/1.5039406},
journal = {Review of Scientific Instruments},
number = 10,
volume = 89,
place = {United States},
year = {2018},
month = {8}
}

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Works referencing / citing this record:

Design and measurement methods for a lithium vapor box similarity experiment
dataset, January 2018

  • Schwartz, J.; Emdee, E.; Jaworski, M.
  • Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
  • DOI: 10.11578/1562010