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

Technical Report · Sat Feb 01 00:00:00 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 Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE; 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
MAGNETIC FIELD CONFIGURATIONS
DISTURBANCES
POLOIDAL FIELD DIVERTORS
ASYMMETRY
AXIAL SYMMETRY
DOUBLET-3 DEVICE
MAGNETIC SURFACES
PLASMA SCRAPE-OFF LAYER
TRAJECTORIES
BOUNDARY LAYERS
CLOSED PLASMA DEVICES
DIVERTORS
LAYERS
SYMMETRY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
700430* - Fusion Technology- Magnet Coils & Fields- (1992-)
700420 - Fusion Technology- Plasma-Facing Components- (1992-)