W Fundamenski 2005 Plasma Phys. Control. Fusion 47 R163 doi:10.1088/0741-3335/47/11/R01
Parallel heat flux limits in the tokamak scrape-off layer
REVIEW ARTICLEW Fundamenski
Show affiliationsTOPICAL REVIEW
It is well known that the classical Spitzer–Harm–Braginskii expression for the parallel plasma heat flux breaks down in the long mean free path limit, relevant to many practical applications, most crucially power exhaust via the tokamak scrape-off layer (SOL). This problem is usually addressed by limiting the heat flux to some fraction of the free streaming value, with constants of proportionality ασ, where σ 
{e,i}, ranging from 0.03 to 3. The following paper presents a brief overview of the problem, compares the results of various kinetic studies, suggests the optimal values of ασ for use in plasma–fluid codes, and examines the impact of these values on 2D SOL simulations using the EDGE2D transport code. In this context, gyro-kinetic parallel heat flux expressions for both electrons and ions are derived from the generalized transport equations—an improved version of Grad's 21-moment approach—and their implications to tokamak modelling are discussed.
- PACS
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52.40.Hf Plasma-material interactions; boundary layer effects
52.55.Fa Tokamaks, spherical tokamaks
52.25.Kn Thermodynamics of plasmas
- Subjects
- Dates
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Issue 11 (November 2005)
Received 6 December 2004, in final form 28 July 2005
Published 5 October 2005
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Parallel heat flux limits in the tokamak scrape-off layer
W Fundamenski 2005 Plasma Phys. Control. Fusion 47 R163
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