Physics design for a lithium vapor box divertor experiment on Magnum-PSI

Schwartz, Jacob ; Emdee, Eric ; Goldston, Robert ; Jaworski, Michael
Issue date: 2019
Creative Commons Attribution 4.0 International (CC BY)
Cite as:
Schwartz, Jacob, Emdee, Eric, Goldston, Robert, & Jaworski, Michael. (2019). Physics design for a lithium vapor box divertor experiment on Magnum-PSI [Data set]. Princeton Plasma Physics Laboratory, Princeton University.
  author      = {Schwartz, Jacob and
                Emdee, Eric and
                Goldston, Robert and
                Jaworski, Michael},
  title       = {{Physics design for a lithium vapor box d
                ivertor experiment on Magnum-PSI}},
  publisher   = {{Princeton Plasma Physics Laboratory, Pri
                nceton University}},
  year        = 2019,
  url         = {}

The lithium vapor box divertor is a potential solution for power exhaust in toroidal confinement devices. The divertor plasma interacts with a localized, dense cloud of lithium vapor, leading to volumetric radiation, cooling, recombination, and detachment. To minimize contamination of the core plasma, lithium vapor is condensed on cool (300°C to 400°C) baffles upstream of the detachment point. Before implementing this in a toroidal plasma device with a slot divertor geometry, we consider an experiment with a scaled baffled-pipe geometry in the high-power linear plasma device Magnum-PSI. Three 15 cm-scale open cylinders joined by 6 cm diameter ‘nozzles’ are positioned on the plasma beam axis upstream of a target. The central box may be loaded with several tens of grams of lithium, which can be evaporated at 650°C to produce a vapor predicted, using a simple plasma-neutral interaction model, to be dense enough to cause volumetric detachment in the plasma. The power delivered to the target and box walls as measured by increases in their temperatures after a 10 s plasma pulse can be compared to determine the effectiveness of the vapor in detaching the plasma. Direct Simulation Monte Carlo simulations are performed to estimate the flow rates of lithium vapor between the boxes and to estimate the trapping of H2 delivered by the plasma in the boxes, which could inadvertently lead to detachment. Details of the geometry, simulations, and possible diagnostic techniques are presented.

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# Filename Filesize
1 readme.txt 2.73 KB
2 Chandra_li_mfp_figure.csv 1.52 KB
3 figure_1.csv 2.92 KB
4 figure_1.eps 22.6 KB
5 figure_1.pdf 9.75 KB
6 figure_2.eps 3.43 MB
7 figure_2.pdf 26.7 KB
8 figure_3.eps 339 KB
9 figure_3.pdf 9.42 KB
10 figure_3_data.txt 763 Bytes
11 figure_4.eps 100 KB
12 figure_4.pdf 34.5 KB
13 figure_5.eps 77.6 KB
14 figure_5.pdf 28.3 KB
15 figure_5_bottom.csv 223 KB
16 figure_5_top.csv 272 KB
17 figure_6.eps 13.5 KB
18 figure_6.pdf 6.56 KB
19 heating_cooling_calculation.nb 338 KB
20 heating_cooling_calculations.pdf 226 KB
21 lithiumDataARK.m 2.89 KB
22 lithiumDataARK.nb 23 KB
23 lithiumDataARK.pdf 85.3 KB
24 materialDataARK.m 3.05 KB
25 materialDataARK.nb 48.4 KB
26 materialDataARK.pdf 74.3 KB
27 simpleVBD_ARK.nb 23.3 KB
28 simpleVBD_ARK.pdf 88.3 KB
29 thermcraftHeatersARK.m 2.98 KB
30 thermcraftHeatersARK.nb 13.8 KB
31 thermcraftHeatersARK.pdf 64.2 KB