Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 438, Issue -, Pages S418-S421Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnucmat.2013.01.084
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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-p) varies linearly with distance (r) from the magnetic null and the snowflake where B-p varies quadratically 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. (C) 2013 Elsevier B. V. All rights reserved.
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