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• W2062992575 abstract "Summary form only given. The high peak heat-flux of plasma exhaust in magnetic fusion devices incident on material surfaces could exceed material limits and must be controlled. The magnetic snowflake divertor <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>1</sup> can alleviate this problem by introducing a null in the poloidal magnetic field, B <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>p</sub> , where B <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>p</sub> 's local strength varies as the square of the distance from the null compared to the linear variation of the standard X-point divertor. The increased magnetic flux expansion of the snowflake and the high ratio of plasma-to-poloidal magnetic pressure, termed β <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>p</sub> , are predicted to reduce both steady state heat flux and that from large, intermittent edge localized modes (ELMs). <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>1,2</sup> Experiments in TCV (Lausanne), NSTX (Princeton Plasma Physics Lab), and DIII-D (General Atomics) tokamaks have observed substantial heat-flux reduction when using a snowflake configuration. Some of these effects have been modeled by the 2D UEDGE edge plasma/neutral transport code. <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>3</sup> Here we present extensions to that modeling to include detailed comparison with the new experimental results from DIII-D. <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>4</sup> In addition, we add a feedback model such that the radial spreading of the ELM by plasma convection <sup xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>2</sup> near the null point is proportional to the local β <sub xmlns:mml=http://www.w3.org/1998/Math/MathML xmlns:xlink=http://www.w3.org/1999/xlink>p</sub> , thus providing a dynamic description of the spreading during the ELM." @default.
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• W2062992575 date "2013-06-01" @default.
• W2062992575 modified "2023-09-24" @default.
• W2062992575 title "PPPS-2013: Modeling snowflake divertors for reduced surface heat-flux in tokamaks" @default.
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• W2062992575 doi "https://doi.org/10.1109/plasma.2013.6635064" @default.
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