Design and measurement methods for a lithium vapor box similarity experiment

J. A. Schwartz, E. D. Emdee, M. A. Jaworski, Robert James Goldston

Research output: Contribution to journalReview articlepeer-review

5 Scopus citations


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.

Original languageEnglish (US)
Article number10J113
JournalReview of Scientific Instruments
Issue number10
StatePublished - Oct 1 2018

All Science Journal Classification (ASJC) codes

  • Instrumentation


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