Role of edge electric field and poloidal rotation in the L - H transition

Journal Article · Mon Jun 18 04:00:00 EDT 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.3015· OSTI ID:6733310

Groebner, R J; Burrell, K H; Seraydarian, R P ^[1]

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1. General Atomics, San Diego, California 92138 (USA)

Marked changes in the edge radial electric field {ital E}{sub {ital r}} and in the edge poloidal rotation velocity {ital v}{sub {theta}} are important signatures of the {ital L}-{ital H} transition in the DIII-D tokamak. Shear exists in {ital E}{sub {ital r}} and {ital v}{sub {theta}} and increases from the {ital L} mode to the {ital H} mode. A comparison of experiment with theory shows that shear in {ital E}{sub {ital r}} and {ital v}{sub {theta}} is sufficient to suppress edge fluctuations, that ion-orbit loss is large enough to be the source of {ital v}{sub {theta}}, and that {ital E}{sub {ital r}} and {ital v}{sub {theta}} may play a causal role in the {ital L}-{ital H} transition.

• DOE Contract Number: AC03-89ER51114
• OSTI ID: 6733310
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:25; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
CHARGED PARTICLES
CLOSED PLASMA DEVICES
CORRELATIONS
DATA
ELECTRIC FIELDS
ELECTRIC HEATING
END EFFECTS
FLUCTUATIONS
HEATING
INFORMATION
IONS
JOULE HEATING
NUMERICAL DATA
ORBITS
PLASMA
PLASMA HEATING
RESISTANCE HEATING
SHEAR
THEORETICAL DATA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
VARIATIONS