High-Harmonic Fast Wave Driven H-mode Plasmas on NSTX

LeBlanc, B. P. ; Bell, R. E. ; Bernabei, S. I. ; Indireshkumar, K. ; Kaye, S. M. ; Maingi, R. ; Mau, T. K. ; Swain, D. W. ; Taylor, G. ; Ryan, P. M. ; Wilgen, J. B ; Wilson, J. R.

Princeton University. Plasma Physics Laboratory.

关键词: Beam Injection;    Heating;    Bootstrap Current;    70 Plasma Physics And Fusion Technology;    Deuterium;   

DOI  :  10.2172/812904
RP-ID  :  PPPL-3816
RP-ID  :  AC02-76CH03073
RP-ID  :  812904

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来源: UNT Digital Library

【 摘 要 】

The launch of High-Harmonic Fast Waves (HHFW) routinely provides auxiliary power to NSTX plasmas, where it is used to heat electrons and pursue drive current. H-mode transitions have been observed in deuterium discharges, where only HHFW and ohmic heating, and no neutral beam injection (NBI), were applied to the plasma. The usual H-mode signatures are observed. A drop of the Da light marks the start of a stored energy increase, which can double the energy content. These H-mode plasmas also have the expected kinetic profile signatures with steep edge density and electron temperature pedestal. Similar to its NBI driven counterpart--also observed on NSTX-- the HHFW H mode have density profiles that features ''ears'' in the peripheral region. These plasmas are likely candidates for long pulse operation because of the combination of bootstrap current, associated with H-mode kinetic profiles, and active current drive, which can be generated with HHFW power.