Separatrix: Difference between revisions

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In the fusion context, the term refers to the trajectories of the magnetic field lines and is used to describe:
In the fusion context, the term refers to the trajectories of the magnetic field lines and is used to describe:
* The boundary between closed and open field lines, separating the toroidally confined region from the region where field lines connect to material surfaces (such as divertors, limiters, or walls) - also known as the Scrape-Off Layer (SOL). This boundary is also called the Last Closed Magnetic Surface (LCMS) or Last Closed Flux Surface (LCFS).
* The boundary between closed and open field lines, separating the toroidally confined region from the region where field lines connect to material surfaces - in the case of a divertor configuration in [[Tokamak|tokamaks]], or a similar situation in other devices.
* The boundary between the inside of a magnetic island and the surrounding region.
* The boundary between the inside of a magnetic island and the surrounding region.
In the case of plasmas that are limited by material objects (limiters or walls),
it is not strictly correct to speak of a separatrix to describe the boundary between the confined plasma and
the external part of the plasma that connects to the wall (the Scrape-Off Layer, SOL).
In this case, it is better to refer to this boundary as the Last Closed Magnetic Surface (LCMS) or Last Closed Flux Surface (LCFS).


== See also ==
== See also ==