Onset of high-n ballooning modes during tokamak sawtooth crashes

Y. Nishimura; J. D. Callen; C. C. Hegna

doi:10.1063/1.873755

Onset of high-n ballooning modes during tokamak sawtooth crashes

Y. Nishimura
, J. D. Callen
, C. C. Hegna

Institute of Space and Plasma Sciences

Research output: Contribution to journal › Conference article › peer-review

31 Citations (Scopus)

Abstract

A new phenomenon has been found during the nonlinear stage of the tokamak sawtooth crash in relatively high β plasmas. The m/n=1/1 magnetic island evolution gives rise to convection of the pressure inside the q=1 radius and builds up steep pressure gradient across the island separatrix, and thereby trigger ballooning instabilities below the threshold at the equilibrium. Effects of the ballooning modes on the magnetic reconnection process during the sawtooth crash are discussed.

Original language	English
Pages (from-to)	4685-4692
Number of pages	8
Journal	Physics of Plasmas
Volume	6
Issue number	12
DOIs	https://doi.org/10.1063/1.873755
Publication status	Published - 1999 Dec
Event	Proceedings of the 1999 APS Centennial Meeting - Atlanta, GA, United States Duration: 1999 Mar 20 → 1999 Mar 26

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1063/1.873755

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title = "Onset of high-n ballooning modes during tokamak sawtooth crashes",

abstract = "A new phenomenon has been found during the nonlinear stage of the tokamak sawtooth crash in relatively high β plasmas. The m/n=1/1 magnetic island evolution gives rise to convection of the pressure inside the q=1 radius and builds up steep pressure gradient across the island separatrix, and thereby trigger ballooning instabilities below the threshold at the equilibrium. Effects of the ballooning modes on the magnetic reconnection process during the sawtooth crash are discussed.",

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AU - Nishimura, Y.

AU - Callen, J. D.

AU - Hegna, C. C.

PY - 1999/12

Y1 - 1999/12

N2 - A new phenomenon has been found during the nonlinear stage of the tokamak sawtooth crash in relatively high β plasmas. The m/n=1/1 magnetic island evolution gives rise to convection of the pressure inside the q=1 radius and builds up steep pressure gradient across the island separatrix, and thereby trigger ballooning instabilities below the threshold at the equilibrium. Effects of the ballooning modes on the magnetic reconnection process during the sawtooth crash are discussed.

AB - A new phenomenon has been found during the nonlinear stage of the tokamak sawtooth crash in relatively high β plasmas. The m/n=1/1 magnetic island evolution gives rise to convection of the pressure inside the q=1 radius and builds up steep pressure gradient across the island separatrix, and thereby trigger ballooning instabilities below the threshold at the equilibrium. Effects of the ballooning modes on the magnetic reconnection process during the sawtooth crash are discussed.

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U2 - 10.1063/1.873755

DO - 10.1063/1.873755

M3 - Conference article

AN - SCOPUS:0038765198

SN - 1070-664X

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SP - 4685

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JO - Physics of Plasmas

JF - Physics of Plasmas

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T2 - Proceedings of the 1999 APS Centennial Meeting

Y2 - 20 March 1999 through 26 March 1999

ER -

Onset of high-n ballooning modes during tokamak sawtooth crashes

Abstract

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