L-H Transition and Power Threshold Studies in the DIII-D Tokamak

Journal Article · Sat Oct 15 04:00:00 EDT 2005 · Fusion Science and Technology

OSTI ID:20854277

Carlstrom, T N ^[1]

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1. General Atomics (United States)

DIII-D contributions to H-mode transition physics and power thresholds are reviewed. Two general approaches were pursued: (a) establishing scaling relations based on empirical observations and (b) acquiring a theoretical understanding of the physics of the transition. The interaction of experiment results and the development of theories over the early 1990s led to the highly successful and widely accepted model of shear suppression of turbulence by crossed electric and magnetic fields (E x B) as the cause of improved confinement in H-mode. Experimental studies have also examined parameters at the edge of the plasma in order to identify a control parameter for the transition and to test various theories of the transition. The effect of the direction of the [nabla]B drift on the H-mode power threshold is used as a tool to further understand the physics of the L-H transition. Results on DIII-D and other tokamaks have guided researchers to study turbulent generated flows as a possible trigger for the L-H transition. Access to H-mode is controlled by a power threshold, and it is important to predict the threshold for next-generation tokamaks. In addition to electron density and toroidal field dependencies, it is found that many other parameters affect the power threshold. Studies of plasma size, magnetic configuration, and neutral effects have been performed. DIII-D data have been used in an international tokamak database to help establish scaling relations to predict power thresholds in future devices.

• OSTI ID: 20854277
• Journal Information: Fusion Science and Technology, Journal Name: Fusion Science and Technology Journal Issue: 2 Vol. 48; ISSN 1536-1055
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CONTROL
DOUBLET-3 DEVICE
ELECTRON DENSITY
H-MODE PLASMA CONFINEMENT
L-MODE PLASMA CONFINEMENT
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
PLASMA
SHEAR
TURBULENCE