NDLI: PPPS-2013: Modeling snowflake divertors for reduced surface heat-flux in tokamaks

Content Provider	IEEE Xplore Digital Library
Author	Rognlien, T.D. Cohen, R.H. Ryutov, D.D. Umansky, M.V. Allen, S.A. Soukhanovskii, V.A.
Copyright Year	2013
Description	Author affiliation: Lawrence Livermore Nat. Lab., Livermore, CA, USA (Rognlien, T.D.; Cohen, R.H.; Ryutov, D.D.; Umansky, M.V.; Allen, S.A.; Soukhanovskii, V.A.)
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 $divertor^{1}$ can alleviate this problem by introducing a null in the poloidal magnetic field, $B_{p},$ where $B_{p}'s$ 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 $β_{p},$ are predicted to reduce both steady state heat flux and that from large, intermittent edge localized modes $(ELMs).^{1,2}$ 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 $code.^{3}$ Here we present extensions to that modeling to include detailed comparison with the new experimental results from $DIII-D.^{4}$ In addition, we add a feedback model such that the radial spreading of the ELM by plasma $convection^{2}$ near the null point is proportional to the local $β_{p},$ thus providing a dynamic description of the spreading during the ELM.
Starting Page	1
Ending Page	1
File Size	106812
Page Count	1
File Format	PDF
ISBN	9781467351713
ISSN	07309244
DOI	10.1109/PLASMA.2013.6635064
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-16
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Heating Magnetic flux Physics Materials Tokamaks Standards
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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