Recent Liquid Lithium Limiter Experiments in CDX-U Page: 3 of 20
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Recent liquid lithium limiter experiments in CDX-U
R. Majeski 1), S. Jardin 1), R. Kaita 1), T. Gray 1), P. Marfuta 1), J. Spaleta 1), J. Timberlake
1), L. Zakharov 1), G. Antar 2), R. Doerner 2), S. Luckhardt 2), R. Seraydarian 2), V.
Soukhanovskii 3), R. Maingi 4), M. Finkenthal 5), D. Stutman 5), D. Rodgers 6), S. Angelini
1) Princeton Plasma Physics Laboratory, Princeton, NJ USA
2) University of California at San Diego, San Diego, CA USA
3) Lawrence Livermore National Laboratory, Livermore, CA USA
4) Oak Ridge National Laboratory, Oak Ridge, TN USA
5) Johns Hopkins University, Baltimore, MD USA
6) University of Delaware, Wilmington, DE USA
7) Columbia University, New York, NY USA
Abstract. Recent experiments in the Current Drive eXperiment - Upgrade (CDX-U) provide
a first-ever test of large area liquid lithium surfaces as a tokamak first wall, to gain
engineering experience with a liquid metal first wall, and to investigate whether very low
recycling plasma regimes can be accessed with lithium walls. The CDX-U is a compact
(R=34 cm, a=22 cm, Btoroidal= 2 kG, Ip =100 kA, Te(0)~100 eV, ne(0)- 5 x 1019 m-3) spherical
torus at the Princeton Plasma Physics Laboratory. A toroidal liquid lithium pool limiter with
an area of 2000 cm2 (half the total plasma limiting surface) has been installed in CDX-U.
Tokamak discharges which used the liquid lithium pool limiter required a fourfold lower loop
voltage to sustain the plasma current, and a factor of 5-8 increase in gas fueling to achieve a
comparable density, indicating that recycling is strongly reduced. Modeling of the discharges
demonstrated that the lithium limited discharges are consistent with Zeffective <1.2 (compared
to 2.4 for the pre-lithium discharges), a broadened current channel, and a 25% increase in the
core electron temperature. Spectroscopic measurements indicate that edge oxygen and carbon
radiation are strongly reduced.
e-mail contact of main author: email@example.com
PACS: 52.55.Fa, 52.40.Hf
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Majeski, R.; Jardin, S.; Kaita, R.; Gray, T.; Marfuta, P.; Spaleta, J. et al. Recent Liquid Lithium Limiter Experiments in CDX-U, report, May 3, 2005; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc781531/m1/3/: accessed September 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.