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Title: Mechanical Design of the NSTX Liquid Lithium Divertor

Abstract

The Liquid Lithium Divertor (LLD) on NSTX will be the first test of a fully-toroidal liquid lithium divertor in a high-power magnetic confinement device. It will replace part of the lower outboard divertor between a specified inside and outside radius, and ultimately provide a lithium surface exposed to the plasma with enough depth to absorb a significant particle flux. There are numerous technical challenges involved in the design. The lithium layer must be as thin as possible, and maintained at a temperature between 200 and 400 degrees Celsius to minimize lithium evaporation. This requirement leads to the use of a thick copper substrate, with a thin stainless steel layer bonded to the plasma-facing surface. A porous molybdenum layer is then plasma-sprayed onto the stainless steel, to provide a coating that facilitates full wetting of the surface by the liquid lithium. Other challenges include the design of a robust, vacuumcompatible heating and cooling system for the LLD. Replacement graphite tiles that provided the proper interface between the existing outer divertor and the LLD also had to be designed, as well as accommodation for special LLD diagnostics. This paper describes the mechanical design of the LLD, and presents analyses showing the performancemore » limits of the LLD.« less

Authors:
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
964196
Report Number(s):
PPPL-4456
TRN: US0904116
DOE Contract Number:  
DE-ACO2-09CH11466
Resource Type:
Conference
Resource Relation:
Conference: 23rd Symposium on Fusion Engineering, San Diego, CA May 31-June 4, 2009
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COATINGS; COOLING SYSTEMS; COPPER; DESIGN; DIVERTORS; EVAPORATION; GRAPHITE; HEATING; LITHIUM; MAGNETIC CONFINEMENT; MOLYBDENUM; PERFORMANCE; PLASMA; STAINLESS STEELS; NSTX

Citation Formats

R. Ellis, R. Kaita, H. Kugel, G. Paluzzi, M. Viola and R. Nygren. Mechanical Design of the NSTX Liquid Lithium Divertor. United States: N. p., 2009. Web.
R. Ellis, R. Kaita, H. Kugel, G. Paluzzi, M. Viola and R. Nygren. Mechanical Design of the NSTX Liquid Lithium Divertor. United States.
R. Ellis, R. Kaita, H. Kugel, G. Paluzzi, M. Viola and R. Nygren. Thu . "Mechanical Design of the NSTX Liquid Lithium Divertor". United States. https://www.osti.gov/servlets/purl/964196.
@article{osti_964196,
title = {Mechanical Design of the NSTX Liquid Lithium Divertor},
author = {R. Ellis, R. Kaita, H. Kugel, G. Paluzzi, M. Viola and R. Nygren},
abstractNote = {The Liquid Lithium Divertor (LLD) on NSTX will be the first test of a fully-toroidal liquid lithium divertor in a high-power magnetic confinement device. It will replace part of the lower outboard divertor between a specified inside and outside radius, and ultimately provide a lithium surface exposed to the plasma with enough depth to absorb a significant particle flux. There are numerous technical challenges involved in the design. The lithium layer must be as thin as possible, and maintained at a temperature between 200 and 400 degrees Celsius to minimize lithium evaporation. This requirement leads to the use of a thick copper substrate, with a thin stainless steel layer bonded to the plasma-facing surface. A porous molybdenum layer is then plasma-sprayed onto the stainless steel, to provide a coating that facilitates full wetting of the surface by the liquid lithium. Other challenges include the design of a robust, vacuumcompatible heating and cooling system for the LLD. Replacement graphite tiles that provided the proper interface between the existing outer divertor and the LLD also had to be designed, as well as accommodation for special LLD diagnostics. This paper describes the mechanical design of the LLD, and presents analyses showing the performance limits of the LLD.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Feb 19 00:00:00 EST 2009},
month = {Thu Feb 19 00:00:00 EST 2009}
}

Conference:
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