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 - in the case of a divertor configuration in [[Tokamak|tokamaks]], or a similar situation in other devices. | * 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|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. | ||
Revision as of 16:11, 15 February 2010
A separatrix is a boundary between domains with distinct dynamical behaviour (phase curves) in a dynamical system. [1] [2]
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 - in the case of a divertor configuration in tokamaks, or a similar situation in other devices.
- 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).