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Scrape-Off Layer: Difference between revisions
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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). | 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|Flux Surface]]. | * With limiter plasmas, this region is the region outside the Last Closed [[Flux surface|Flux Surface]] (LCFS). | ||
* With [[Divertor|divertor]] plasmas, this region is the region outside the [[Separatrix|separatrix]]. | * With [[Divertor|divertor]] plasmas, this region is the region outside the [[Separatrix|separatrix]]. | ||
Transport in the SOL is very different from transport in the confined plasma due to the open field lines: | In divertor plasmas, the SOL absorbs most of the plasma exhaust (particles and heat) and transports it along the field lines to the divertor plates. | ||
Hence, this region is of prime importance for future reactors. | |||
Transport in the SOL is very different from transport in the confined plasma due to the open field lines: it is predominantly convective (rather than diffusive). | |||
Typically, the density decays exponentially away from the LCFS. | |||
This does not mean that the detailed transport is easy to understand or model: intermittency is very strong in the SOL region. | |||
<ref>[http://dx.doi.org/10.1016/S0375-9601(01)00252-3 S.I. Krasheninnikov, ''On scrape off layer plasma transport'', Phys. Lett. A, '''283''', 5-6 (2001) 368]</ref> | <ref>[http://dx.doi.org/10.1016/S0375-9601(01)00252-3 S.I. Krasheninnikov, ''On scrape off layer plasma transport'', Phys. Lett. A, '''283''', 5-6 (2001) 368]</ref> | ||
<ref>[http://onlinelibrary.wiley.com/doi/10.1002/ctpp.200410030/abstract D.A. D'Ippolito et al, ''Blob Transport in the Tokamak Scrape-off-Layer'', Contrib. Plasma Phys, '''44''', 1-3 (2004) 205]</ref> | <ref>[http://onlinelibrary.wiley.com/doi/10.1002/ctpp.200410030/abstract D.A. D'Ippolito et al, ''Blob Transport in the Tokamak Scrape-off-Layer'', Contrib. Plasma Phys, '''44''', 1-3 (2004) 205]</ref> | ||
== References == | == References == | ||
<references /> | <references /> | ||