Dynamics of resistive double tearing modes with broad linear spectra

Bierwage, Andreas; Benkadda, Sadruddin; Hamaguchi, Satoshi; Wakatani, Masahiro

doi:https://doi.org/10.1063/1.2446420

Dynamics of resistive double tearing modes with broad linear spectra

Bierwage, Andreas; Benkadda, Sadruddin; Hamaguchi, Satoshi et al.

Physics of Plasmas, 2007, 14(2), 022107

Number of Access:253（2025-08-28 19:19 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/78478

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Title	Dynamics of resistive double tearing modes with broad linear spectra
Creator	NRID 1000010584691 1000010584691 CreatorName Bierwage, Andreas
	CreatorName Benkadda, Sadruddin
	NRID 1000060301826 1000060301826 ORCID 0000-0001-6580-8797 0000-0001-6580-8797 researchmap permalink satoshi_hamaguchi satoshi_hamaguchi Scopus Author ID 55220082400 55220082400 CreatorName Hamaguchi, Satoshi
	NRID 1000000109357 1000000109357 CreatorName Wakatani, Masahiro
Description	A. Bierwage et al., Physics of Plasmas 14, 022107 (2007) https://doi.org/10.1063/1.2446420
Abstract	The nonlinear evolution of resistive double tearing modes (DTMs) with safety factor values q=1 and q=3 is studied with a reduced cylindrical model of a tokamak plasma. We focus on cases where the resonant surfaces are a small distance apart. Recent numerical studies have shown that in such configurations high- m modes are strongly unstable and may peak around m= mpeak ∼10. In this paper, it is first demonstrated that this result agrees with existing linear theory for DTMs. Based on this theory, a semiempirical formula for the dependence of mpeak on the system parameters is proposed. Second, with the use of nonlinear simulations, it is shown that the presence of fast growing high- m modes leads to a rapid turbulent collapse in an annular region, where small magnetic island structures form. Furthermore, consideration is given to the evolution of low- m modes, in particular the global m=1 internal kink, which can undergo nonlinear driving through coupling to fast growing linear high- m DTMs. Factors influencing the details of the dynamics are discussed. These results may be relevant to the understanding of the magnetohydrodynamic activity near the minimum of q and may thus be of interest for studies on stability and confinement of advanced tokamaks. © 2007 American Institute of Physics.
Publisher	American Institute of Physics
Source Title	Physics of Plasmas
Volume (Issue)	14(2)
Page	022107
Date of Issued	2007-02
Language	English
Handle URL	https://hdl.handle.net/11094/78478
PISSN	1070664X
NCID	AA11868303
Relation.isIdenticalTo	DOI (Publisher Version) https://doi.org/10.1063/1.2446420
Access Rights	open access
CopyRight	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Plasmas 14, 022107 (2007) and may be found at https://doi.org/10.1063/1.2446420.
oaire:version	Version of Record
Category	学術雑誌論文 Journal Article

Resource Type	journal article
Local Type	Journal Article
DCTERMS.bibliographicCitation	Physics of Plasmas. 2007, 14(2), p. 022107
DC.title	Dynamics of resistive double tearing modes with broad linear spectra
DC.creator	Bierwage, Andreas
	Benkadda, Sadruddin
	Hamaguchi, Satoshi
	Wakatani, Masahiro
DC.publisher	American Institute of Physics
DC.language' scheme='DCTERMS.RFC1766	English
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2007-02
DC.identifier	https://doi.org/10.1063/1.2446420
DC.description	A. Bierwage et al., Physics of Plasmas 14, 022107 (2007) https://doi.org/10.1063/1.2446420
DCTERMS.abstract	The nonlinear evolution of resistive double tearing modes (DTMs) with safety factor values q=1 and q=3 is studied with a reduced cylindrical model of a tokamak plasma. We focus on cases where the resonant surfaces are a small distance apart. Recent numerical studies have shown that in such configurations high- m modes are strongly unstable and may peak around m= mpeak ∼10. In this paper, it is first demonstrated that this result agrees with existing linear theory for DTMs. Based on this theory, a semiempirical formula for the dependence of mpeak on the system parameters is proposed. Second, with the use of nonlinear simulations, it is shown that the presence of fast growing high- m modes leads to a rapid turbulent collapse in an annular region, where small magnetic island structures form. Furthermore, consideration is given to the evolution of low- m modes, in particular the global m=1 internal kink, which can undergo nonlinear driving through coupling to fast growing linear high- m DTMs. Factors influencing the details of the dynamics are discussed. These results may be relevant to the understanding of the magnetohydrodynamic activity near the minimum of q and may thus be of interest for studies on stability and confinement of advanced tokamaks. © 2007 American Institute of Physics.
DC.rights	This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Physics of Plasmas 14, 022107 (2007) and may be found at https://doi.org/10.1063/1.2446420.
DC.format	78478
citation_title	Dynamics of resistive double tearing modes with broad linear spectra
citation_author	Bierwage, Andreas
	Benkadda, Sadruddin
	Hamaguchi, Satoshi
	Wakatani, Masahiro
citation_publisher	American Institute of Physics
citation_language	English
citation_date	2007-02
citation_journal_title	Physics of Plasmas
citation_volume	14
citation_issue	2
citation_firstpage	022107
citation_doi	https://doi.org/10.1063/1.2446420
citation_public_url	https://hdl.handle.net/11094/78478

Dynamics of resistive double tearing modes with broad linear spectra

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