1996
DOI: 10.1103/physrevlett.77.3553
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Abstract: Off-axis sawteeth are often observed in reversed magnetic shear plasmas when the minimum safety factor q is near or below 2. Fluctuations with m/n = 2/1 (m and n are the poloidal and toroidal mode numbers) appear before and after the crashes. Detailed comparison has been made between the measured Te profile evolution during the crash and a nonlinear numerical magnetohydrodynamics (MHD) simulation. The good agreement between the observation and simulation indicates that the off-axis sawteeth are due to a dou bl… Show more

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Cited by 146 publications
(98 citation statements)
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“…This result is the first observation of the double m = 2 mode during the off-axis sawtooth collapse. However, the appearance of double m = 2 mode as the postcursor of the collapse does not coincide with the prediction of the simulation in [1].…”
Section: Soft X-ray Computer Tomography Of Double M =contrasting
confidence: 58%
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“…This result is the first observation of the double m = 2 mode during the off-axis sawtooth collapse. However, the appearance of double m = 2 mode as the postcursor of the collapse does not coincide with the prediction of the simulation in [1].…”
Section: Soft X-ray Computer Tomography Of Double M =contrasting
confidence: 58%
“…In [1], a nonlinear magnetohydrodynamics simulation showed that the off-axis collapse was due to the double-tearing magnetic reconnection. The appearance of the double m = 2 mode was predicted as the precursor of the collapse in the simulation [1]. However, the existence of the double m = 2 mode has not yet been identified in those previous experiments.…”
Section: Soft X-ray Computer Tomography Of Double M =mentioning
confidence: 98%
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“…In et al 13 and Z. Chang et al. 14 In Sec. II the experimental observations of the localized MHD activity will be described.…”
Section: Introductionmentioning
confidence: 99%
“…21,22 Since q-profile is nonmonotonic in NS configuration, MHD instabilities related to two resonant surfaces having the same qϭ2 can be destabilized. Development of double-tearing instability between two off-axis qϭ2 surfaces is thought to be a main driving mechanism of the q ϭ2 off-axis sawtooth in NS tokamaks.…”
Section: Change Of the Internal Structure Due To The Crashmentioning
confidence: 99%