Assessment of effects of neutrals on the power threshold for L to H transitions in DIII-D

Conference · Mon Sep 01 00:00:00 EDT 1997

OSTI ID:642744

Owen, L W; Carreras, B A; Maingi, R; Mioduszewski, P K ^[1]; Carlstrom, T N; Groebner, R J ^[2]

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1. Oak Ridge National Lab., TN (United States)
2. General Atomics, San Diego, CA (United States)

To assess the effect of edge neutrals on the low to high confinement transition threshold, a broad range of plasma discharges has been analyzed. From this analysis, the transition power divided by the density, at constant magnetic field, appears to be a function of a single parameter measuring the neutrals` effect, This parameter cannot be uniquely identified. For instance, it may be the radial decay length of the neutral profile or the charge exchange damping rate at about r/a {approx} 0.95. This results suggest that there is a missing parameter linked to the neutrals in the power threshold scaling laws.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE Assistant Secretary for Fossil Energy, Washington, DC (United States); USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC05-96OR22464; AC03-89ER51114
• OSTI ID: 642744
• Report Number(s): ORNL/CP-94439; CONF-9709100-; ON: DE98000334; TRN: 98:009909
• Resource Relation: Conference: US/Japan workshop on H-mode physics and 6th H-mode workshop, Kloster Seeon (Germany), 22-24 Sep 1997; Other Information: PBD: Sep 1997
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
H-MODE PLASMA CONFINEMENT
MAGNETIC CONFINEMENT
ELECTRON DENSITY
SCALING LAWS
POWER
DOUBLET-3 DEVICE
ENERGY LOSSES
CHARGE EXCHANGE
NEUTRAL PARTICLES