Locked modes and magnetic field errors in the Madison Symmetric Torus

Journal Article · Tue Dec 01 04:00:00 EST 1992 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860473· OSTI ID:6946502

Almagri, A F; Assadi, S; Prager, S C; Sarff, J S; Kerst, D W ^[1]

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1. Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)

In the Madison Symmetric Torus (MST) reversed-field pinch (Fusion Technol. {bold 19}, 131 (1991)) magnetic oscillations become stationary (locked) in the lab frame as a result of a process involving interactions between the modes, sawteeth, and field errors. Several helical modes become phase locked to each other to form a rotating localized disturbance, the disturbance locks to an impulsive field error generated at a sawtooth crash, the error fields grow monotonically after locking (perhaps due to an unstable interaction between the modes and field error), and over tens of milliseconds of growth confinement degrades and the discharge eventually terminates. Field error control has been partially successful in eliminating locking.

• OSTI ID: 6946502
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 4:12; ISSN 0899-8221; ISSN PFBPE
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700310 -- Plasma Confinement-- (1992-)
700340* -- Plasma Waves
Oscillations
& Instabilities-- (1992-)
CLOSED PLASMA DEVICES
CONFINEMENT
ERRORS
INSTABILITY
MODE LOCKING
PINCH EFFECT
PLASMA CONFINEMENT
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
REVERSE-FIELD PINCH
TEARING INSTABILITY
THERMONUCLEAR DEVICES
TOKAMAK DEVICES