Observation of Abrupt- and Fast-rising SOL Current during Trigger Phase of ELMs in DIII-D Tokamak

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Extensive studies to date of edge localized modes (ELMs) have sought their origin inside the separatrix, i.e., MHD instability from steep gradients in the plasma edge, and examined their consequences outside the separatrix, i.e., transport of heat and particles in the scrape-off-layer (SOL) and divertors. Recent measurement by a high-speed scrape-off-layer current (SOLC) diagnostic may indicate that the ELM trigger process lies, in part, in the SOL. Thermoelectrically driven SOLC precedes, or co-evolves with, other parameters of the ELM process, and thus can potentially play a causal role: error field generated by non-axisymmetric SOLC, flowing in the immediate vicinity (approximately ... continued below

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616 Kilobytes pages

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Takahashi, H.; Fredrickson, E. D.; Schaffer, M. J.; Austin, M. E.; Brooks, N. H.; Evans, T. E. et al. June 27, 2005.

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Extensive studies to date of edge localized modes (ELMs) have sought their origin inside the separatrix, i.e., MHD instability from steep gradients in the plasma edge, and examined their consequences outside the separatrix, i.e., transport of heat and particles in the scrape-off-layer (SOL) and divertors. Recent measurement by a high-speed scrape-off-layer current (SOLC) diagnostic may indicate that the ELM trigger process lies, in part, in the SOL. Thermoelectrically driven SOLC precedes, or co-evolves with, other parameters of the ELM process, and thus can potentially play a causal role: error field generated by non-axisymmetric SOLC, flowing in the immediate vicinity (approximately 1 cm) of the plasma edge, may contribute toward destabilizing MHD modes. The SOLC, observed concurrently with MHD activity, including ELMs, has been reported elsewhere.

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616 Kilobytes pages

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INIS; OSTI as DE00841347

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  • Other Information: PBD: 27 Jun 2005

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  • Report No.: PPPL-4089
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/841347 | External Link
  • Office of Scientific & Technical Information Report Number: 841347
  • Archival Resource Key: ark:/67531/metadc788997

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  • June 27, 2005

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  • Dec. 3, 2015, 9:30 a.m.

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  • June 10, 2016, 8:29 p.m.

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Takahashi, H.; Fredrickson, E. D.; Schaffer, M. J.; Austin, M. E.; Brooks, N. H.; Evans, T. E. et al. Observation of Abrupt- and Fast-rising SOL Current during Trigger Phase of ELMs in DIII-D Tokamak, report, June 27, 2005; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc788997/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.