Correction of the axial asymmetry of the poloidal magnetic field in the Globus-M spherical tokamak

Journal Article · Tue Jun 15 00:00:00 EDT 2010 · Plasma Physics Reports

DOI:https://doi.org/10.1134/S1063780X10060024· OSTI ID:21443516

Petrov, Yu V; Patrov, M I; Varfolomeev, V I; Gusev, V K ^[1]; Lamzin, E A ^[2]; Sakharov, N V ^[1]; Sychevskii, S E ^[2]

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1. Russian Academy of Sciences, Ioffe Physicotechnical Institute (Russian Federation)
2. D.V. Efremov Scientific Research Institute of Electrophysical Apparatus (Russian Federation)

The toroidal inhomogeneity of the poloidal magnetic field-the so-called error fields that arise due to imperfections in manufacturing and assembling of the electromagnetic system-was measured in the Globus-M spherical tokamak. A substantial inhomogeneity corresponding to the n = 1 mode, which gave rise to a locked mode and led to discharge disruption, was revealed. After compensation of this inhomogeneity with the help of special correction coils, the discharge duration increased and the global plasma parameters improved substantially. A technique for determining and compensating the n = 1 mode inhomogeneity is described, the measured dependences of the penetration threshold of the m = 2/n = 1 mode on the plasma parameters are given, and results of experiments in which record parameters for the Globus-M tokamak were achieved after correction of the poloidal magnetic field are presented.

• OSTI ID: 21443516
• Journal Information: Plasma Physics Reports, Vol. 36, Issue 6; Other Information: DOI: 10.1134/S1063780X10060024; Copyright (c) 2010 Pleiades Publishing, Ltd.; ISSN 1063-780X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASYMMETRY
CORRECTIONS
GLOBUS-M SPHEROMAK
MAGNETIC FIELDS
PLASMA
CLOSED PLASMA DEVICES
SPHEROMAK DEVICES
THERMONUCLEAR DEVICES
TOKAMAK DEVICES