Stabilizing effect of helical current drive on tearing modes

The effect of helical driven current on the m = 2/n = 1 tearing mode is studied numerically in a cylindrical geometry using the method of reduced magneto-hydro-dynamic simulation. The results show that the local persistent helical current drive from the beginning time can be applied to control the t...

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Veröffentlicht in:Physics of plasmas 2018-01, Vol.25 (1)
Hauptverfasser: Yuan, Y., Lu, X. Q., Dong, J. Q., Gong, X. Y., Zhang, R. B.
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container_issue 1
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container_title Physics of plasmas
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creator Yuan, Y.
Lu, X. Q.
Dong, J. Q.
Gong, X. Y.
Zhang, R. B.
description The effect of helical driven current on the m = 2/n = 1 tearing mode is studied numerically in a cylindrical geometry using the method of reduced magneto-hydro-dynamic simulation. The results show that the local persistent helical current drive from the beginning time can be applied to control the tearing modes, and will cause a rebound effect called flip instability when the driven current reaches a certain value. The current intensity threshold value for the occurrence of flip instability is about 0.00087I0. The method of controlling the development of tearing mode with comparative economy is given. If the local helical driven current is discontinuous, the magnetic island can be controlled within a certain range, and then, the tearing modes stop growing; thus, the flip instability can be avoided. We also find that the flip instability will become impatient with delay injection of the driven current because the high order harmonics have been developed in the original O-point. The tearing mode instability can be controlled by using the electron cyclotron current drive to reduce the gradient of the current intensity on the rational surfaces.
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We also find that the flip instability will become impatient with delay injection of the driven current because the high order harmonics have been developed in the original O-point. The tearing mode instability can be controlled by using the electron cyclotron current drive to reduce the gradient of the current intensity on the rational surfaces.</description><identifier>ISSN: 1070-664X</identifier><identifier>EISSN: 1089-7674</identifier><identifier>DOI: 10.1063/1.5006851</identifier><identifier>CODEN: PHPAEN</identifier><language>eng</language><publisher>Melville: American Institute of Physics</publisher><subject>Computer simulation ; Control stability ; Cyclotrons ; Magnetic islands ; Plasma physics ; Tearing ; Tearing modes (plasmas)</subject><ispartof>Physics of plasmas, 2018-01, Vol.25 (1)</ispartof><rights>Author(s)</rights><rights>2018 Author(s). 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We also find that the flip instability will become impatient with delay injection of the driven current because the high order harmonics have been developed in the original O-point. 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source AIP Journals Complete; Alma/SFX Local Collection
subjects Computer simulation
Control stability
Cyclotrons
Magnetic islands
Plasma physics
Tearing
Tearing modes (plasmas)
title Stabilizing effect of helical current drive on tearing modes
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