Comparison of ELM heat loads in snowflake and standard divertors

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An analysis is given of the impact of the tokamak divertor magnetic structure on the temporal and spatial divertor heat flux from edge localized modes (ELMs). Two configurations are studied: the standard divertor where the poloidal magnetic field (B{sub p}) varies linearly with distance (r) from the magnetic null and the snowflake where B{sub p} varies quadratrically with r. Both one and two-dimensional models are used to analyze the effect of the longer magnetic field length between the midplane and the divertor plate for the snowflake that causes a temporal dilation of the ELM divertor heat flux. A second effect ... continued below

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Rognlien, T D; Cohen, R H; Ryutov, D D & Umansky, M V May 8, 2012.

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An analysis is given of the impact of the tokamak divertor magnetic structure on the temporal and spatial divertor heat flux from edge localized modes (ELMs). Two configurations are studied: the standard divertor where the poloidal magnetic field (B{sub p}) varies linearly with distance (r) from the magnetic null and the snowflake where B{sub p} varies quadratrically with r. Both one and two-dimensional models are used to analyze the effect of the longer magnetic field length between the midplane and the divertor plate for the snowflake that causes a temporal dilation of the ELM divertor heat flux. A second effect discussed is the appearance of a broad region near the null point where the poloidal plasma beta can substantially exceed unity, especially for the snowflake configuration during the ELM; such a condition is likely to drive additional radial ELM transport.

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PDF-file: 15 pages; size: 3 Mbytes

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  • Presented at: International Conference on Plasma Surface Interactions, Aachen, Germany, May 21 - May 25, 2012

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  • Report No.: LLNL-PROC-556936
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1043647
  • Archival Resource Key: ark:/67531/metadc835029

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Office of Scientific & Technical Information Technical Reports

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  • May 8, 2012

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  • May 19, 2016, 3:16 p.m.

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  • Nov. 22, 2016, 11:07 p.m.

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Rognlien, T D; Cohen, R H; Ryutov, D D & Umansky, M V. Comparison of ELM heat loads in snowflake and standard divertors, article, May 8, 2012; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc835029/: accessed December 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.