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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 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 (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 the inside of a magnetic island and the surrounding region. | * The boundary between the inside of a magnetic island and the surrounding region. | ||