Locked modes and magnetic field errors in the Madison Symmetric Torus

A. F. Almagri; S. Assadi; S. C. Prager; J. S. Sarff; D. W. Kerst

doi:10.1063/1.860473

Locked modes and magnetic field errors in the Madison Symmetric Torus

A. F. Almagri, S. Assadi, S. C. Prager, J. S. Sarff, D. W. Kerst

Research output: Contribution to journal › Article › peer-review

78 Scopus citations

Abstract

In the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 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.

Original language	English (US)
Pages (from-to)	4080-4085
Number of pages	6
Journal	Physics of Fluids B
Volume	4
Issue number	12
DOIs	https://doi.org/10.1063/1.860473
State	Published - 1992

All Science Journal Classification (ASJC) codes

Computational Mechanics
Condensed Matter Physics
Mechanics of Materials
General Physics and Astronomy
Fluid Flow and Transfer Processes

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10.1063/1.860473

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abstract = "In the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 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.",

author = "Almagri, {A. F.} and S. Assadi and Prager, {S. C.} and Sarff, {J. S.} and Kerst, {D. W.}",

year = "1992",

doi = "10.1063/1.860473",

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T1 - Locked modes and magnetic field errors in the Madison Symmetric Torus

AU - Almagri, A. F.

AU - Assadi, S.

AU - Prager, S. C.

AU - Sarff, J. S.

AU - Kerst, D. W.

PY - 1992

Y1 - 1992

N2 - In the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 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.

AB - In the Madison Symmetric Torus (MST) reversed-field pinch [Fusion Technol. 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.

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ER -

Locked modes and magnetic field errors in the Madison Symmetric Torus

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