Control of magnetic islands by pellet injection in tokamaks

K. C. Shaing, W. A. Houlberg, M. Peng

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Abstract

The appearance of magnetic islands in tokamaks degrades plasma confinement. It is therefore important to control or eliminate the growth of the islands to improve the performance of a tokamak. A theory is developed to control magnetic islands using the localized pressure gradient driven bootstrap current by injecting pellets at the O -point of the island to create a peaked plasma pressure profile inside the island. This localized bootstrap current replenishes the missing equilibrium bootstrap current density that causes the island to grow in the first place. It is shown that the effect of the localized bootstrap current tends to reduce or eliminate the original drive for the growth of the island in the island evolution equation. The theory is also valid for the localized bootstrap current created by localized heating, but with much less effectiveness. A possibility of eliminating the island by controlling the equilibrium profiles is also discussed.

Original languageEnglish
Article number072501
JournalPhysics of Plasmas
Volume14
Issue number7
DOIs
Publication statusPublished - 2007 Aug 7

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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