Tearing Mode Behavior in the Globus-M Spherical Tokamak Plasma

The 2/1 tearing mode instability during the plateau phase of the plasma current time evolution has been observed since the start of the Globus-M spherical tokamak operation. Because of a small amount of shots in a database, the poloidal beta dependence of the instability growth rate had been investi...

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Bibliographic Details
Published in:Physics of atomic nuclei 2018-12, Vol.81 (7), p.1033-1036
Main Authors: Dudkovskaya, A. V., Patrov, M. I., Gusev, V. K., Kurskiev, G. S., Petrov, Yu. V.
Format: Article
Language:English
Subjects:
Analysis
Dependence
Evolution
Magnetic coils
Magnetic islands
Particle and Nuclear Physics
Physics
Physics and Astronomy
Plasma
Plasma currents
Spherical plasmas
Stability
Tearing
Tokamak devices
Tokamaks
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Summary:The 2/1 tearing mode instability during the plateau phase of the plasma current time evolution has been observed since the start of the Globus-M spherical tokamak operation. Because of a small amount of shots in a database, the poloidal beta dependence of the instability growth rate had been investigated with an insufficient accuracy. In this work, a more detailed analysis has been produced that proves the fact that the observed modes can be treated as neoclassical. The saturated island width as a function of poloidal beta has been obtained; a time evolution of the magnetic island has been calculated from the Mirnov magnetic coil signals and compared to the modified Rutherford theory, and the critical magnetic island width has been found for the neoclassical tearing mode (NTM) of the Globus-M tokamak.
ISSN:1063-7788
1562-692X
DOI:10.1134/S1063778818070025