Effect of nonaxisymmetric perturbations on the structure of a tokamak poloidal divertor

Journal Article · Wed Apr 01 04:00:00 EST 1992 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860110· OSTI ID:7046958

Pomphrey, N; Reiman, A ^[1]

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1. Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543 (United States)

The effects of {ital n}=1 nonaxisymmetric perturbations on a tokamak poloidal divertor are described. Despite the existence of a region of chaotic field line trajectories outside the last closed flux surface, the footprint of the trajectories on the divertor plates is found to be largely coherent, forming a spiral structure. At a fixed toroidal angle, the footprint exhibits a bifurcation similar to that seen experimentally on DIII-D (Nucl. Fusion {bold 28}, 902 (1988)). For field errors of the magnitude that exist in present-day tokamaks, the width of the nonaxisymmetric structure in the divertor footprint is comparable to the width of the scrape-off layer.

• DOE Contract Number: AC02-76CH03073
• OSTI ID: 7046958
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:4; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310* -- Plasma Confinement-- (1992-)
ASYMMETRY
CLOSED PLASMA DEVICES
CONFINEMENT
DIVERTORS
MAGNETIC FIELD CONFIGURATIONS
PERTURBATION THEORY
PLASMA CONFINEMENT
PLASMA SIMULATION
SIMULATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRAJECTORIES