Particle and heat spreading in the tokamak divertor via turbulent mixing

Particle and heat spreading in the tokamak divertor via turbulent mixing

Particle and heat spreading in the tokamak divertor via turbulent mixing 150 150 UKAEA Opendata
UKAEA-CCFE-CP(19)21

Particle and heat spreading in the tokamak divertor via turbulent mixing

A firm grasp of transport processes perpendicular to the magnetic field line is required in order to understand and predict heat and particle fluxes to divertor components in tokamaks. Perpendicular transport from the hot core into the scrape-off layer (SOL) upstream impacts the SOL profile at the divertor via parallel streaming along the magnetic field line. Downstream, below the X-point, perpendicular transport can spread heat and particles from the SOL into the private-flux region (PFR) thereby broadening the deposition profile on the divertor. A significant component of the upstream perpendicular transport is likely due to intermittent ejection of filamentary objects [1] which are under active study. Downstream perpendicular transport is less precisely understood, though recent camera measurements in MAST have demonstrated the presence of complex filamentary transport in the divertor also [2]. For many plasma processes in the divertor, localised turbulent transport is likely to be important yet it remains poorly understood. This paper focusses on the nature of downstream divertor localised turbulent transport through numerical simulation.

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23rd International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI), Princeton, NJ, USA, 17-22 June 2018