Effects of large area liquid lithium limiters on spherical torus plasmas

被引:17
作者
Kaita, R
Majeski, R
Boaz, M
Efthimion, P
Gettelfinger, G
Gray, T
Hoffman, D
Jardin, S
Kugel, H
Marfuta, P
Munsat, T
Neumeyer, C
Raftopoulos, S
Soukhanovskii, V
Spaleta, J
Taylor, G
Timberlake, J
Woolley, R
Zakharov, L
Finkenthal, M
Stutman, D
Delgado-Aparicio, L
Seraydarian, RP
Antar, G
Doerner, R
Luckhardt, S
Baldwin, M
Conn, RW
Maingi, R
Menon, M
Causey, R
Buchenauer, D
Ulrickson, M
Jones, B
Rodgers, D
机构
[1] Princeton Plasma Phys Lab, Princeton, NJ 08543 USA
[2] Lawrence Livermore Natl Lab, Livermore, CA USA
[3] Johns Hopkins Univ, Baltimore, MD USA
[4] Univ Calif San Diego, La Jolla, CA 92093 USA
[5] Oak Ridge Natl Lab, Oak Ridge, TN USA
[6] Sandia Natl Labs, Albuquerque, NM 87185 USA
[7] Drexel Univ, Philadelphia, PA 19104 USA
关键词
liquid metal; lithium; particle control; recycling; wall pumping;
D O I
10.1016/j.jnucmat.2004.10.019
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Use of a large-area liquid lithium surface as a limiter has significantly improved the plasma performance in the Current Drive Experiment-Upgrade (CDX-U) at the Princeton Plasma Physics Laboratory. Previous CDX-U experiments with a partially-covered toroidal lithium limiter tray have shown a decrease in impurities and the recycling of hydrogenic species. Improvements in loading techniques have permitted nearly full coverage of the tray surface with liquid lithium. Under these conditions, there was a large drop in the loop voltage needed to sustain the plasma current. The data are consistent with simulations that indicate more stable plasmas having broader current profiles, higher temperatures, and lowered impurities with liquid lithium walls. As further evidence for reduced recycling with a liquid lithium limiter, the gas puffing had to be increased by up to a factor of eight for the same plasma density achieved with an empty toroidal tray limiter. (c) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:872 / 876
页数:5
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