Diagnostics for Liquid Lithium Experiments in CDX-U
Authors: R. Kaita, P. Efthimion, D. Hoffman, B. Jones, H. Kugel, R. Majeski, T. Munsat, S. Raftopoulos, G. Taylor, J. Timberlake, V. Soukhanovskii, D. Stutman, M. Iovea, M. Finkenthal, R. Doerner, S. Luckhardt, R. Maingi, and R. Causey
Date of PPPL Report: June 2000
Published in: Rev. Sci. Instrum. 72 (January 2001) 915-918.
A flowing liquid lithium first wall or divertor target could virtually eliminate the concerns with power density and erosion, tritium retention, and cooling associated with solid walls in fusion reactors. To investigate the interaction of a spherical torus plasma with liquid lithium limiters, large area divertor targets, and walls, discharges will be established in the Current Drive Experiment-Upgrade (CDX-U) where the plasma-wall interactions are dominated by liquid lithium surfaces. Among the unique CDX-U lithium diagnostics is a multi-layer mirror (MLM) array, which will monitor the 135 Å LiIII line for core lithium concentrations. Additional spectroscopic diagnostics include a grazing incidence XUV spectrometer (STRS) and a filterscope system to monitor D alpha and various impurity lines local to the lithium limiter. Profile data will be obtained with a multichannel tangential bolometer and a multipoint Thomson scattering system configured to give enhanced edge resolution. Coupons on the inner wall of the CDX-U vacuum vessel will be used for surface analysis. A 10,000 frame per second fast visible camera and an IR camera will also be available.