Open AccessOverview of impurity control and wall conditioning in NSTX
Author(s) -
H. Kugel,
R. Maingi,
W.R. Wampler,
Robert E. Barry,
M.G. Bell,
W. Blanchard,
D. Gates,
D. W. Johnson,
R. Kaita,
S. M. Kaye,
R. J. Maqueda,
J. Ménard,
M. M. Me,
D. Mueller,
M. Ono,
S. F. Paul,
Y-K.M. Peng,
R. Raman,
A. L. Roquemore,
C.H. Skinner,
S.A. Sabbagh,
B. Stratton,
D. Stutman,
J. R. Wilson,
S. J. Zweben
Publication year - 2000
Language(s) - English
Resource type - Reports
DOI - 10.2172/758243
Subject(s) - coaxial , plasma , impurity , atomic physics , reproducibility , conditioning , physics , spherical tokamak , mechanics , materials science , tokamak , chemistry , mathematics , engineering , electrical engineering , nuclear physics , chromatography , quantum mechanics , statistics
The National Spherical Torus Experiment (NSTX) started plasma operations i n February 1999. In the first extended period of experiments, NSTX achieved high current, inner wall limited, double null, and single null plasma discharges, initial Coaxial Helicity Injection, and High Harmonic Fast Wave results. As expected, discharge reproducibility and performance were strongly affected by wall conditions. In this paper, the authors describe the internal geometry, and initial plasma discharge, impurity control, wall conditioning, erosion, and deposition results