Scrape-Off Layer
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The term Scrape-Off Layer (SOL) refers to the plasma region characterized by open field lines (commencing or ending on a material surface).
- With limiter plasmas, this region is the region outside the Last Closed Flux Surface.
- With divertor plasmas, this region is the region outside the separatrix.
Transport in the SOL is very different from transport in the confined plasma due to the open field lines: basically, it is more convective and less diffusive. [1] [2] This does not mean that it is easy to understand or model: intermittency is very strong in the SOL region.