Stochastic broadening of the separatrix of a tokamak divertor

Journal Article · Mon Dec 07 04:00:00 EST 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.3322· OSTI ID:6932938

Punjabi, A; Verma, A ^[1]; Boozer, A ^[2]

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1. Hampton University, Hampton, Virginia 23668 (United States)
2. College of William and Mary, Williamsburg, Virginia 23185 (United States) Max-Planck-Institut fuer Plasmaphysik, D-8046 Garching (Germany)

The plasma in a modern tokamak is bounded by a separatrix between magnetic field lines that form toroidal magnetic surfaces, on which the plasma is confined, and open field lines that divert the plasma exhaust to so-called divertor plates. This separatrix is sharp in an ideal tokamak, but we show that magnetic perturbations create a stochastic region of open field lines inside the ideal separatrix which contains approximately 6 times the magnetic flux as does the strike points of these lines on the divertor plates. Since magnetic field lines are a 11/2 degree of freedom Hamiltonian system, the behavior of the field lines in a tokamak divertor is archetypal for the similar Hamiltonian systems.

• DOE Contract Number: FG05-88ER53265; FG05-90ER54106
• OSTI ID: 6932938
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:23; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700412* -- Magnetic Confinement Devices-- (1992-)
ANNULAR SPACE
CLOSED CONFIGURATIONS
CLOSED PLASMA DEVICES
CONFIGURATION
DATA
DIVERTORS
HAMILTONIANS
INFORMATION
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC SURFACES
MAPS
MATHEMATICAL OPERATORS
NUMERICAL DATA
PLASMA
QUANTUM OPERATORS
SPACE
STOCHASTIC PROCESSES
THEORETICAL DATA
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOROIDAL CONFIGURATION