Stabilization of sawtooty oscillation by island heating

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Using the compressible resistive MHD equations in a finite aspect ratio cylinder, it is found that the m = 1 mode (the sawtooth oscillation) can saturate when the pressure inside the magnetic island is higher than that of the original core plasma. The saturation condition is of the form ..delta beta../sub p/ greater than or equal to 8 epsilon/sup -1//sub q = 1/ (1 - q/sub 0/)/sup 2/. This saturation effect can be used to actively stabilize sawteeth by heating the island and/or by cooling the core plasma. This mechanism together with a stabilizing toroidal effect may also explain recent ... continued below

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Pages: 13

Creation Information

Park, W.; Monticello, D.A. & Chu, T.K. October 1, 1986.

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Description

Using the compressible resistive MHD equations in a finite aspect ratio cylinder, it is found that the m = 1 mode (the sawtooth oscillation) can saturate when the pressure inside the magnetic island is higher than that of the original core plasma. The saturation condition is of the form ..delta beta../sub p/ greater than or equal to 8 epsilon/sup -1//sub q = 1/ (1 - q/sub 0/)/sup 2/. This saturation effect can be used to actively stabilize sawteeth by heating the island and/or by cooling the core plasma. This mechanism together with a stabilizing toroidal effect may also explain recent lower-hybrid-wave-driven tokamak experiments where the saturation of sawteeth has been observed.

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Pages: 13

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NTIS, PC A02/MF A01.

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  • Other: DE87003075
  • Report No.: PPPL-2385
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/7056099 | External Link
  • Office of Scientific & Technical Information Report Number: 7056099
  • Archival Resource Key: ark:/67531/metadc1185689

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • October 1, 1986

Added to The UNT Digital Library

  • July 2, 2018, 10:52 p.m.

Description Last Updated

  • Feb. 27, 2019, 1:27 p.m.

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Park, W.; Monticello, D.A. & Chu, T.K. Stabilization of sawtooty oscillation by island heating, report, October 1, 1986; New Jersey. (https://digital.library.unt.edu/ark:/67531/metadc1185689/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.