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

Technical Report · Sat Feb 01 04:00:00 EST 1992

DOI:https://doi.org/10.2172/5689318· OSTI ID:5689318

Pomphrey, N; Reiman, A

The effects of 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. 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.

• Research Organization: Princeton Univ., NJ (United States). Plasma Physics Lab.
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH03073
• OSTI ID: 5689318
• Report Number(s): PPPL-2801; ON: DE92008507
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700420 -- Fusion Technology-- Plasma-Facing Components-- (1992-)
700430* -- Fusion Technology-- Magnet Coils & Fields-- (1992-)
ASYMMETRY
AXIAL SYMMETRY
BOUNDARY LAYERS
CLOSED PLASMA DEVICES
DISTURBANCES
DIVERTORS
DOUBLET-3 DEVICE
LAYERS
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC SURFACES
PLASMA SCRAPE-OFF LAYER
POLOIDAL FIELD DIVERTORS
SYMMETRY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TRAJECTORIES