A snowflake divertor: a possible solution to the power exhaust problem for tokamaks

Ryutov, D. D.; Cohen, R. H.; Rognlien, T. D.; Umansky, M. V.

doi:10.1088/0741-3335/54/12/124050

A snowflake divertor: a possible solution to the power exhaust problem for tokamaks

Journal Article · Wed Nov 21 04:00:00 EST 2012 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/0741-3335/54/12/124050· OSTI ID:1225690

Ryutov, D. D.; Cohen, R. H.; Rognlien, T. D.; Umansky, M. V.

This paper summarizes recent progress in the theory of a snowflake divertor, a possible path to reduce both steady-state and intermittent heat loads on the divertor plates to an acceptable level. The most important feature of a SF divertor is the presence of a large zone of a very weak poloidal magnetic field around the poloidal field (PF) null. Qualitative explanation of a variety of new features characteristic of a SF divertor is provided based on simple scaling relations. The main part of the paper is focused on the concept of spreading of the heat flux by curvature-driven convection near the PF null. References to experimental results from the NSTX and TCV tokamaks are provided.

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Research Organization:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC52-07NA27344

OSTI ID:: 1225690

Report Number(s):: LLNL-JRNL--562678

Journal Information:: Plasma Physics and Controlled Fusion, Journal Name: Plasma Physics and Controlled Fusion Journal Issue: 12 Vol. 54; ISSN 0741-3335

Publisher:: IOP Science

Country of Publication:: United States

Language:: English

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