Self-Sustained Divertor Oscillation Driven by Magnetic Island Dynamics in Torus Plasma

Self-Sustained Divertor Oscillation Driven by Magnetic Island Dynamics in Torus Plasma

A new type of self-sustained divertor oscillation is discovered in the Large Helical Device stellarator, where the peripheral plasma is detached from material diverters by means of externally applied perturbation fields. The divertor oscillation is found to be a self-regulation of an isolated magnet...

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Veröffentlicht in:Physical review letters 2022-02, Vol.128 (8), p.085001, Article 085001
Hauptverfasser: Kobayashi, T, Kobayashi, M, Narushima, Y, Suzuki, Y, Watanabe, K Y, Mukai, K, Hayashi, Y
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container_issue 8
container_start_page 085001
container_title Physical review letters
container_volume 128
creator Kobayashi, T
Kobayashi, M
Narushima, Y
Suzuki, Y
Watanabe, K Y
Mukai, K
Hayashi, Y
description A new type of self-sustained divertor oscillation is discovered in the Large Helical Device stellarator, where the peripheral plasma is detached from material diverters by means of externally applied perturbation fields. The divertor oscillation is found to be a self-regulation of an isolated magnetic field structure (the magnetic island) width induced by a drastic change in a poloidal inhomogeneity of the plasma radiation across the detachment-attachment transitions. A predator-prey model between the magnetic island width and a self-generated local plasma current (the bootstrap current) is introduced to describe the divertor oscillation, which successfully reproduces the experimental observations.
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title Self-Sustained Divertor Oscillation Driven by Magnetic Island Dynamics in Torus Plasma
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