Catastrophe in the stochastic layer due to dipole perturbation for a single-null divertor Tokamak

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:489389

Ali, H; Watson, M; Punjabi, A; Boozer, A ^[1]

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1. Hampton Univ., VA (United States)

We use the method of maps developed by Punjabi and Boozer to investigate the motion of magnetic field lines in stochastic scrape-off layer in the presence of dipole perturbation of a single-null divertor Tokamak. This method is based on the idea that the magnetic field line trajectories in a divertor tokamak are mathematically equivalent to a single degree of freedom, time dependent Hamiltonian System, and that the basic features of motion near a separatrix broadened by asymmetric perturbations are generic for such Hamiltonian and near-Hamiltonian systems. The magnetic topology of a single-null divertor tokamak with the effects on dipole perturbations is represented by the Symmetric Simple Map followed by Dipole Map. We have found that as the amplitude of the dipole perturbation increases, the width of the stochastic layer also increases. At some critical value of the amplitude is reached, there is a catastrophic increase in the width of stochastic layer. This may have significant implications for tokamak divertor physics.

• OSTI ID: 489389
• Report Number(s): CONF-960354--
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
DISTURBANCES
DIVERTORS
HAMILTONIANS
MAGNETIC FIELD CONFIGURATIONS
PLASMA SCRAPE-OFF LAYER
TOKAMAK DEVICES