Design and measurement methods for a lithium vapor box similarity experiment

doi:https://doi.org/10.1063/1.5039406

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:

^[1]; Emdee, E. D. ^[1]; Jaworski, M. A. ^[2]; Goldston, R. J. ^[1]

Princeton Univ., Princeton, NJ (United States)
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)

Publication Date:: 2018-08-10

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:: Journal Article: 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.

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                    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

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                    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.

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@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},

  url          = {https://www.osti.gov/biblio/1465999},
  journal      = {Review of Scientific Instruments},

  issn         = {0034-6748},

  number       = 10,

  volume       = 89,

  place        = {United States},

  year         = {2018},

  month        = {8}

}

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