Characterization and Modification of Edge-Driven Instabilities in the DIII-D Tokamak

Conference · Thu Jul 01 04:00:00 EDT 1999

OSTI ID:766941

Ferron, J R ^[1]; Lao, L L; Osborne, T H; Strait, E J; Turnbull, A D; Miller, R L; Taylor, T S; Doyle, E J; Rice, B W; Zhang, C; Chen, L; Baylor, L R; Murakami, M; Wade, M R

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1. General Atomics

The character of edge localized modes (ELMs) and the height of the edge pressure pedestal in DIII-D tokamak H-mode discharges have been modified by varying the discharge shape (triangularity and squareness) and the safety factor, increasing the edge radiation, and injecting deuterium pellets. Changes in the ELM frequency and amplitude, and the magnitude of the edge pressure gradient, and changes in the calculated extent of the region of access to the ballooning mode second stability regime are observed.

• Research Organization: General Atomics, San Diego, CA (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC03-99ER54463; W-7405-ENG-48; AC05-96OR22464; FG03-86ER53225; FG03-94ER54271
• OSTI ID: 766941
• Report Number(s): GA-A23156
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DEUTERIUM
DOUBLET-3 DEVICE
EDGE LOCALIZED MODES
H-MODE PLASMA CONFINEMENT
MODIFICATIONS
PRESSURE GRADIENTS