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 /> | ||
Revision as of 07:00, 10 July 2011
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 (LCFS).
- With divertor plasmas, this region is the region outside the separatrix.
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. [1] [2]