Stability and Confinement Properties of Auxiliary Heated NSTX Discharges

Menard, J.E. ; R.E.Bell ; Bourdelle, C. ; Darrow, D.S. ; Fredrickson, E.D. ; Gates, D.A. ; Grisham, L.R. ; Kaye, S.M. ; LeBlanc, B.P. ; Maingi, R. ; Medley, S.S. ; Mueller, D. ; Paoletti, F. ; Sabbagh, S.A. ; Stutman, D. ; Swain, D.W. ; Wilson, J.R. ; Bell, M.G. ; Bialek, J.M. ; C.E.Bush ; Hosea, J.C. ; Johnson, D.W. ; Kaita, R. ; Kugel, H.W. ; Maqueda, R.J. ; Ono, M. ; Peng, Y-K.M. ; Skinner, C.H. ; Soukhanovskii, V.A. ; Synakowski, E.J. ; Taylor, G. ; Wurden, G.A. ; Zweben, and S.J.

Princeton University. Plasma Physics Laboratory.

关键词: Auxiliary Heating;    Nstx Device;    70 Plasma Physics And Fusion Technology;    Electron Density;    H-Mode Plasma Confinement;   

DOI  :  10.2172/787717
RP-ID  :  PPPL-3587
RP-ID  :  AC02-76CH03073
RP-ID  :  787717

美国|英语

来源: UNT Digital Library

【 摘 要 】

The National Spherical Torus Experiment (NSTX) is a spherical tokamak with nominal plasma major radius R(subscript ''0'') = 0.85 m, minor radius a = 0.66 m, and aspect ratio A > 1.28. Typical discharge parameters are plasma current I (subscript ''p'') = 0.7-1.4 MA, toroidal magnetic field B(subscript ''t0'') = 0.25-0.45 Tesla at major radius R(subscript ''0''), elongation = 1.7-2.2, triangularity 0.3-0.5, line-average electron density = 2-5 x 10(superscript ''19'') m(superscript ''-3''), electron temperature T(subscript ''e'')(0) = 0.5-1.5 keV, and ion temperature T(subscript ''i'')(0) = 0.5-2 keV. The NSTX auxiliary heating systems can routinely deliver 4.5 MW of 80-keV deuterium neutral beams and 3 MW of 30-MHz high-harmonic fast-wave power. Kinetic profile diagnostics presently include a 10-channel, 30-Hz multipulse Thomson scattering system (MPTS), a 17-channel charge-exchange recombination spectroscopy (CHERS) system, a 48-chord ultra-soft X-ray (USXR) array, and a 15-chord bolometry array. Initial experiments utilizing auxiliary heating on NSTX have focused on MHD stability limits, confinement trends, studying H-mode characteristics, and performing initial power balance calculations.