Observation of helical sawtooth oscillations in a tokamak

Technical Report · Fri Feb 01 04:00:00 EST 1985

OSTI ID:5760875

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

In the Tokapole II tokamak the three-dimensional structure of the rapid sawtooth crash which 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, non-rotating magnetic island.

• Research Organization: Wisconsin Univ., Madison (USA). Dept. of Physics
• DOE Contract Number: AC02-76ET53051
• OSTI ID: 5760875
• Report Number(s): DOE/ET/53051-79; ON: DE85012062
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
CLOSED PLASMA DEVICES
ELECTROMAGNETIC RADIATION
HELICITY
INTERNAL RING DEVICES
IONIZING RADIATIONS
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC ISLANDS
MATHEMATICAL MODELS
PARTICLE PROPERTIES
PLASMA DISRUPTION
RADIATIONS
THERMONUCLEAR DEVICES
TOKAMAK DEVICES
TOKAPOLE DEVICES
X RADIATION