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| Home » Plasma Dictionary - S » Sawtooth |
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| Plasma Dictionary - Terms Started With Alphabet S |
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Term : Sawtooth
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Definition : When a tokamak runs with enough current to achieve a safety factor q < 1 on the magnetic axis, the plasma parameters (n, T, B) are often observed to oscillate with a ``sawtooth'' waveform, with long steady increases followed by sudden short decreases, known as sawtooth crashes. Similar phenomena are seen in some other toroidal magnetic confinement systems. The oscillation is localized to a region roughly within the q = 1 magnetic flux surface, and arises from internal magnetohydrodynamic effects. Plasma confinement is degraded within the sawtooth region. Empirically it is found that the interval between sawteeth increases when a sufficient number of superthermal ions are present, but in that case the subsequent sawtooth amplitude is correspondingly increased.
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