Geodesic acoustic mode (GAM) like oscillations and RMP effect in the STOR-M tokamak

A new kind of quasi-coherent mode was observed in ohmic plasma in the STOR-M tokamak. It is featured with a clear solitary peak around 30-35 kHz in the power spectra of the ion saturation current (Isat) of Langmuir probe as well as poloidal and toroidal mode numbers (m  =  1,n  =  0) as per the pred...

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Published inNuclear fusion Vol. 58; no. 2; pp. 24001 - 24006
Main Authors Basu, Debjyoti, Nakajima, Masaru, Melnikov, A.V., McColl, David, Rohollahi, Akbar, Elgriw, Sayf, Xiao, Chijin, Hirose, Akira
Format Journal Article
LanguageEnglish
Published IOP Publishing 01.02.2018
Subjects
plasmas
tokamak
turbulent
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Abstract A new kind of quasi-coherent mode was observed in ohmic plasma in the STOR-M tokamak. It is featured with a clear solitary peak around 30-35 kHz in the power spectra of the ion saturation current (Isat) of Langmuir probe as well as poloidal and toroidal mode numbers (m  =  1,n  =  0) as per the prediction of conventional geodesic acoustic mode (GAM) theory. The dispersion relation of the mode is also similar to GAM and it also shows collisional damping. In contrast to conventional GAM, the floating potential φ of the observed GAM-like mode does not show similar symmetric poloidal and toroidal mode numbers (m  =  0,n  =  0), but has (m  =  1,n  =  1). The GAM-like mode has also a pronounced magnetic component with mixed poloidal modes (m=3 and m=5;n=1), as observed by Mirnov coils. This mode is suppressed by the application of resonance magnetic perturbations.
AbstractList A new kind of quasi-coherent mode was observed in ohmic plasma in the STOR-M tokamak. It is featured with a clear solitary peak around 30-35 kHz in the power spectra of the ion saturation current (Isat) of Langmuir probe as well as poloidal and toroidal mode numbers (m  =  1,n  =  0) as per the prediction of conventional geodesic acoustic mode (GAM) theory. The dispersion relation of the mode is also similar to GAM and it also shows collisional damping. In contrast to conventional GAM, the floating potential φ of the observed GAM-like mode does not show similar symmetric poloidal and toroidal mode numbers (m  =  0,n  =  0), but has (m  =  1,n  =  1). The GAM-like mode has also a pronounced magnetic component with mixed poloidal modes (m=3 and m=5;n=1), as observed by Mirnov coils. This mode is suppressed by the application of resonance magnetic perturbations.
Author Melnikov, A.V.
Hirose, Akira
Rohollahi, Akbar
Xiao, Chijin
Basu, Debjyoti
McColl, David
Nakajima, Masaru
Elgriw, Sayf
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Snippet A new kind of quasi-coherent mode was observed in ohmic plasma in the STOR-M tokamak. It is featured with a clear solitary peak around 30-35 kHz in the power...
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SubjectTerms plasmas
tokamak
turbulent
Title Geodesic acoustic mode (GAM) like oscillations and RMP effect in the STOR-M tokamak
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