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Role of explosive instabilities in high-$\beta$ disruptions in tokamaks
Plasma Physics · Submitted 3 Mar 2016
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Intrinsically explosive growth of a ballooning finger is demonstrated in nonlinear magnetohydrodynamic calculations of high-$\beta$ disruptions in tokamaks.
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The abstract, sentence by sentence
Intrinsically explosive growth of a ballooning finger is demonstrated in nonlinear magnetohydrodynamic calculations of high-$\beta$ disruptions in tokamaks. The explosive finger is formed by an ideally unstable n=1 mode, dominated by an m/n=2/1 component. The quadrupole geometry of the 2/1 perturbed pressure field provides a generic mechanism for the formation of the initial ballooning finger and its subsequent transition from exponential to explosive growth, without relying on secondary processes. The explosive ejection of the hot plasma from the core and stochastization of the magnetic field occur in Alfv\'enic time scales, accounting for the extremely fast growth of the precursor oscillations and the rapidity of the thermal quench in some high-$\beta$ disruptions.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | Intrinsically explosive growth of a ballooning finger is demonstrated in nonlinear magnetohydrodynamic calculations of high-$\beta$ disruptions in tokamaks. | result 0.89 | 0.91 | 0.76 | asserted 1.00 |
| s1 | The explosive finger is formed by an ideally unstable n=1 mode, dominated by an m/n=2/1 component. | result 0.99 | 0.81 | 0.11 | asserted 1.00 |
| s2 | The quadrupole geometry of the 2/1 perturbed pressure field provides a generic mechanism for the formation of the initial ballooning finger and its subsequent transition from exponential to explosive growth, without relying on secondary processes. | interpretation 0.92 | 0.80 | 0.47 | asserted 0.99 |
| s3 | The explosive ejection of the hot plasma from the core and stochastization of the magnetic field occur in Alfv\'enic time scales, accounting for the extremely fast growth of the precursor oscillations and the rapidity of the thermal quench in some high-$\beta$ disruptions. | interpretation 0.76 | 0.76 | 0.25 | asserted 0.90 |
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The paper
Original abstract
Intrinsically explosive growth of a ballooning finger is demonstrated in nonlinear magnetohydrodynamic calculations of high-$\beta$ disruptions in tokamaks. The explosive finger is formed by an ideally unstable n=1 mode, dominated by an m/n=2/1 component. The quadrupole geometry of the 2/1 perturbed pressure field provides a generic mechanism for the formation of the initial ballooning finger and its subsequent transition from exponential to explosive growth, without relying on secondary processes. The explosive ejection of the hot plasma from the core and stochastization of the magnetic field occur in Alfv\'enic time scales, accounting for the extremely fast growth of the precursor oscillations and the rapidity of the thermal quench in some high-$\beta$ disruptions.
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