Observation of helical sawtooth oscillations in a tokamak

Journal Article · Fri Nov 01 04:00:00 EST 1985 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.865344· OSTI ID:5171329

Brickhouse, N S; Osborne, T H; Dexter, R N; Prager, S C

In the Tokapole II tokamak (Nucl. Fusion 19, 1509 (1979)) the three-dimensional structure of the rapid sawtooth crash that accompanies internal disruptions has been observed. The sawtooth crash is helical, i.e., the decrease in soft x-ray intensity occurs along a q = 1 helical contour, in accord with the standard reconnection model. The poloidally asymmetric radial expansion of the crash inward from the q = 1 surface provides a measure of the reconnection time consistent with single helicity reconnection from a growing, nonrotating magnetic island.

• Research Organization: Department of Physics, University of Wisconsin at Madison, Madison, Wisconsin 53706
• OSTI ID: 5171329
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 28:11; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
CLOSED PLASMA DEVICES
CONFIGURATION
ELECTROMAGNETIC RADIATION
EMISSION
HELICAL CONFIGURATION
INHIBITION
INTERNAL RING DEVICES
IONIZING RADIATIONS
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC ISLANDS
OSCILLATIONS
PHOTON EMISSION
PLASMA
PLASMA DIAGNOSTICS
PLASMA DISRUPTION
RADIATIONS
SOFT X RADIATION
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOKAPOLE DEVICES
X RADIATION