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Edge stability of the ELM-free quiescent
H-mode on DIII-D |
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W.P.West, K.H. Burrell, T.A. Casper, E.J. Doyle, P.B. Snyder,
P. Gohil, L.L. Lao, C.J. Lasnier, A.W. Leonard, M.F.F. Nave,
T.H. Osborne, D.M. Thomas, G.Wang and L. Zeng |
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2005 |
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DOI |
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Resumo |
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The quiescentH(QH) mode, an edge localized mode (ELM)-free and high-confinement mode, combines well with an
internal transport barrier to form quiescent double barrier stationary state, high performance plasmas. The QH-mode
edge pedestal pressure is similar to that seen in ELMing phases of the same discharge, with similar global energy
confinement. The pedestal density in early ELMing phases of strongly pumped counter injection discharges drops,
and a transition to QH-mode occurs, leading to lower calculated edge bootstrap current. The plasmas current ramp
experiment and ELITE code modelling of edge stability suggest that QH-modes lie near an edge current stability
boundary. |
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