skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Physics design for a lithium vapor box divertor experiment on magnum PSI

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 (300–400°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. Here, 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 vapormore » between the boxes and to estimate the trapping of H 2 delivered by the plasma in the boxes, which could inadvertently lead to detachment. Details of the geometry, simulations, and possible diagnostic techniques are presented.« less

Authors:
ORCiD logo; ORCiD logo; ;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1547758
Alternate Identifier(s):
OSTI ID: 1498791
Grant/Contract Number:  
AC02-09CH11466
Resource Type:
Journal Article: Published Article
Journal Name:
Nuclear Materials and Energy
Additional Journal Information:
Journal Name: Nuclear Materials and Energy Journal Volume: 18 Journal Issue: C; Journal ID: ISSN 2352-1791
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; Divertor; Lithium vapor

Citation Formats

Schwartz, Jacob A., Emdee, Eric D., Goldston, R. J., and Jaworski, M. A. Physics design for a lithium vapor box divertor experiment on magnum PSI. Netherlands: N. p., 2019. Web. doi:10.1016/j.nme.2019.01.024.
Schwartz, Jacob A., Emdee, Eric D., Goldston, R. J., & Jaworski, M. A. Physics design for a lithium vapor box divertor experiment on magnum PSI. Netherlands. https://doi.org/10.1016/j.nme.2019.01.024
Schwartz, Jacob A., Emdee, Eric D., Goldston, R. J., and Jaworski, M. A. Tue . "Physics design for a lithium vapor box divertor experiment on magnum PSI". Netherlands. https://doi.org/10.1016/j.nme.2019.01.024.
@article{osti_1547758,
title = {Physics design for a lithium vapor box divertor experiment on magnum PSI},
author = {Schwartz, Jacob A. and Emdee, Eric D. and Goldston, R. J. and Jaworski, M. A.},
abstractNote = {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 (300–400°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. Here, 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.},
doi = {10.1016/j.nme.2019.01.024},
url = {https://www.osti.gov/biblio/1547758}, journal = {Nuclear Materials and Energy},
issn = {2352-1791},
number = C,
volume = 18,
place = {Netherlands},
year = {2019},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at https://doi.org/10.1016/j.nme.2019.01.024

Figures / Tables:

Figure 1 Figure 1: Required vapor temperature T and corresponding Li vapor fluxes Γ(T ) to satisfy Equation 1 for r = 0.93 cm, P = 3 kW, $$\epsilon_c$$ = 6 eV as a function of length d.

Save / Share:

Works referenced in this record:

Physics design for a lithium vapor box divertor experiment on Magnum-PSI
dataset, January 2019


    Works referencing / citing this record:

    Physics design for a lithium vapor box divertor experiment on Magnum-PSI
    dataset, January 2019


      Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.