Kinetic Profiles in NSTX Plasmas

Bell, R.E. ; LeBlanc, B.P. ; Bourdelle, C. ; Ernst, D.R. ; Fredrickson, E.D. ; Gates, D.A. ; Hosea, J.C. ; Johnson, D.W. ; Kaye, S.M. ; Maingi, R. ; Medley, S. ; Menard, J.E. ; Mueller, D. ; Ono, M. ; Paoletti, F. ; Peng, M. ; Sabbagh, S.A. ; Stutman, D. ; Swain, D.W. ; Synakowski, E.J. ; Wilson, and J.R.

Princeton University. Plasma Physics Laboratory.

关键词: Electron Density;    Auxiliary Heating;    Nstx Device;    70 Plasma Physics And Fusion Technology;    Deuterium;   

DOI  :  10.2172/787778
RP-ID  :  PPPL-3591
RP-ID  :  AC02-76CH03073
RP-ID  :  787778

美国|英语

来源: UNT Digital Library

【 摘 要 】

The National Spherical Torus Experiment (NSTX) is a low aspect ratio (R/a approximately 1.3) device with auxiliary heating from neutral-beam injection (NBI) and high-harmonic fast-wave heating (HHFW). Typical NSTX parameters are R(subscript ''0'') = 85 cm, a = 67 cm, I(subscript ''p'') = 0.7-1.4 MA, B(subscript ''phi'') = 0.25-0.45 T. Three co-directed deuterium neutral-beam sources have injected P(subscript ''NB'') less than or equal to 4.7 MW. HHFW plasmas typically have delivered P(subscript ''RF'') less than or equal to 3 MW. Important to the understanding of NSTX confinement are the new kinetic profile diagnostics: a multi-pulse Thomson scattering system (MPTS) and a charge-exchange recombination spectroscopy (CHERS) system. The MPTS diagnostic currently measures electron density and temperature profiles at 30 Hz at ten spatial locations. The CHERS system has recently become available to measure carbon ion temperature and toroidal flow at 17 radial positions spanning the outer half of the minor radius with 20 msec time resolution during NBI. Experiments conducted during the last year have produced a wide range of kinetic profiles in NSTX. Some interesting examples are presented below.