Hysteresis in Sawtooth Crash in ASDEX Upgrade Tokamak

Dumbrājs, O.; Igochine, V.; Zohm, H.; Team, Asdex

doi:10.2174/1876534300801010009

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2011

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“…A single parameter hysteresis model is used in Ref. 10 to describe experimental data on sawtooth crash in the ASDEX Upgrade tokamak. The model is based on hysteresis, which arises due to the fact that the value of the current density gradient (approximated for the H-mode discharges studied there, by the temperature gradient) at the q ¼ 1 surface required to turn on the instability is greater than the gradient required to maintain the instability, once it is turned on.…”

Section: Introductionmentioning

confidence: 99%

A low-dimensional model system for quasi-periodic plasma perturbations

et al. 2011

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Larger scale plasma instabilities not leading to an immediate termination of a discharge often result in periodic nonlinear perturbations of the plasma. A minimal possible model is formulated for description of the system with drive and relaxation processes which have different time scales. The model is based on two equations: the first being responsible for the relaxation dynamics and the second for the drive. The model can be generalized to describe the pellet injection.

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Section: Introductionmentioning

confidence: 99%