Comparison of L-H transition measurements with physics models

Conference · Tue Dec 01 00:00:00 EST 1998

OSTI ID:296838

Carlstrom, T N; Burrell, K H; Groebner, R J; Leonard, A W; Osborne, T H; Thomas, D M

A technique of fitting a modified hyperbolic tangent to the edge profiles has improved the localization of plasma edge parameters. Non-dimensional edge parameters are broadly consistent with several theories of the L-H transition that use edge gradients in their formulation of a critical threshold parameter. The ion {del}B drift direction has only a small effect on the edge plasma conditions measured near the plasma midplane but a large effect on the divertor plasma. The dramatic change of power threshold with the direction of the ion {del}B drift implies that phenomena in the divertor region may be critical for the L-H transition.

• Research Organization: General Atomics, San Diego, CA (United States)
• Sponsoring Organization: USDOE Office of Energy Research, Washington, DC (United States)
• DOE Contract Number: AC03-89ER51114
• OSTI ID: 296838
• Report Number(s): GA-A22989; CONF-981064-; ON: DE99001353; TRN: 99:002479
• Resource Relation: Conference: 17. IAEA fusion energy conference, Yokohama (Japan), 19-24 Oct 1998; Other Information: PBD: Dec 1998
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
H-MODE PLASMA CONFINEMENT
ION DRIFT
DIVERTORS
MAGNETIC SURFACES
DOUBLET-3 DEVICE
ELECTRON DENSITY
ELECTRON TEMPERATURE
ION TEMPERATURE