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Please use this identifier to cite or link to this item: http://arks.princeton.edu/ark:/88435/dsp01h702q9164
 Title: Physics design for a lithium vapor box divertor experiment on Magnum-PSI Contributors: Schwartz, JacobEmdee, EricGoldston, RobertJaworski, MichaelU. S. Department of Energy contract number DE-AC02-09CH11466 Keywords: divertorlithium vapor Issue Date: 30-Jan-2019 Publisher: Princeton Plasma Physics Laboratory, Princeton University Related Publication: Nuclear Materials and Energy, Volume 18, January 2019, Pages 350-355 Abstract: 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. URI: http://arks.princeton.edu/ark:/88435/dsp01h702q9164 Referenced By: https://doi.org/10.1016/j.nme.2019.01.024 Appears in Collections: Plasma Science & Technology

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