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Title: Conceptual design of a pre-loaded liquid lithium divertor target for NSTX-U

Abstract

In this study, a conceptual design for a pre-filled liquid lithium divertor target for the National Spherical Torus Experiment Upgrade (NSTX-U) is presented. The design is aimed at facilitating experiments with high lithium flux from the plasma facing components (PFCs) in NSTX-U and investigating the potential of capillary based liquid lithium components. In the design, lithium is supplied from a reservoir in the PFC to the plasma facing surface via capillary action in a wicking structure. This working principle is also demonstrated experimentally. Next, a titanium zirconium molybdenum (TZM) prototype design is presented, required to withstand a steady state heat flux peaking at 10 MW m –2 for 5 s and edge localized modes depositing (130 kJ in 2 ms at 10 Hz). The main challenge is to sufficiently reduce the thermal stresses. This is achieved by dividing the surface into brushes and filling the slots in between with liquid lithium. The principle of using this liquid “interlayer” allows for thermal expansion and simultaneously heat conduction, and could be used to significantly reduce the demands to solids in future PFCs. Lithium flow to the surface is analyzed using a novel analytical model, ideally suited for design purposes. Thermal stresses inmore » the PFC are analyzed using the finite element method. As a result, the requirements are met, and thus a prototype will be manufactured for physical testing.« less

Authors:
 [1];  [1];  [1]; ORCiD logo [2];  [2]
  1. Eindhoven Univ. of Technology, Eindhoven (The Netherlands)
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1335696
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Fusion Engineering and Design
Additional Journal Information:
Journal Volume: 112; Journal Issue: C; Journal ID: ISSN 0920-3796
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 42 ENGINEERING; fusion; divertor; lithium; capillary; NSTX-U

Citation Formats

Rindt, P., Lopes Cardozo, N. J., van Dommelen, J. A. W., Kaita, R., and Jaworski, M. A. Conceptual design of a pre-loaded liquid lithium divertor target for NSTX-U. United States: N. p., 2016. Web. doi:10.1016/j.fusengdes.2016.08.020.
Rindt, P., Lopes Cardozo, N. J., van Dommelen, J. A. W., Kaita, R., & Jaworski, M. A. Conceptual design of a pre-loaded liquid lithium divertor target for NSTX-U. United States. doi:10.1016/j.fusengdes.2016.08.020.
Rindt, P., Lopes Cardozo, N. J., van Dommelen, J. A. W., Kaita, R., and Jaworski, M. A. Sat . "Conceptual design of a pre-loaded liquid lithium divertor target for NSTX-U". United States. doi:10.1016/j.fusengdes.2016.08.020. https://www.osti.gov/servlets/purl/1335696.
@article{osti_1335696,
title = {Conceptual design of a pre-loaded liquid lithium divertor target for NSTX-U},
author = {Rindt, P. and Lopes Cardozo, N. J. and van Dommelen, J. A. W. and Kaita, R. and Jaworski, M. A.},
abstractNote = {In this study, a conceptual design for a pre-filled liquid lithium divertor target for the National Spherical Torus Experiment Upgrade (NSTX-U) is presented. The design is aimed at facilitating experiments with high lithium flux from the plasma facing components (PFCs) in NSTX-U and investigating the potential of capillary based liquid lithium components. In the design, lithium is supplied from a reservoir in the PFC to the plasma facing surface via capillary action in a wicking structure. This working principle is also demonstrated experimentally. Next, a titanium zirconium molybdenum (TZM) prototype design is presented, required to withstand a steady state heat flux peaking at 10 MW m–2 for 5 s and edge localized modes depositing (130 kJ in 2 ms at 10 Hz). The main challenge is to sufficiently reduce the thermal stresses. This is achieved by dividing the surface into brushes and filling the slots in between with liquid lithium. The principle of using this liquid “interlayer” allows for thermal expansion and simultaneously heat conduction, and could be used to significantly reduce the demands to solids in future PFCs. Lithium flow to the surface is analyzed using a novel analytical model, ideally suited for design purposes. Thermal stresses in the PFC are analyzed using the finite element method. As a result, the requirements are met, and thus a prototype will be manufactured for physical testing.},
doi = {10.1016/j.fusengdes.2016.08.020},
journal = {Fusion Engineering and Design},
number = C,
volume = 112,
place = {United States},
year = {Sat Sep 03 00:00:00 EDT 2016},
month = {Sat Sep 03 00:00:00 EDT 2016}
}

Journal Article:
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