The snowflake divertor

Ryutov, D. D.; Soukhanovskii, V. A.

doi:10.1063/1.4935115

Title: The snowflake divertor

Journal Article · Sun Nov 15 00:00:00 EST 2015 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4935115· OSTI ID:22489817

Ryutov, D. D.; Soukhanovskii, V. A. ^[1]

Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)

The snowflake magnetic configuration is characterized by the presence of two closely spaced poloidal field nulls that create a characteristic hexagonal (reminiscent of a snowflake) separatrix structure. The magnetic field properties and the plasma behaviour in the snowflake are determined by the simultaneous action of both nulls, this generating a lot of interesting physics, as well as providing a chance for improving divertor performance. Among potential beneficial effects of this geometry are: increased volume of a low poloidal field around the null, increased connection length, and the heat flux sharing between multiple divertor channels. The authors summarise experimental results obtained with the snowflake configuration on several tokamaks. Wherever possible, relation to the existing theoretical models is described.

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OSTI ID:: 22489817

Journal Information:: Physics of Plasmas, Vol. 22, Issue 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X

Country of Publication:: United States

Language:: English

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