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Self-Organised Criticality: Difference between revisions
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A system is said to be in this state when it is at an attractive critical point at which it behaves as in a phase transition (i.e., the spatial and temporal scales are scale-invariant, or nearly so). | A system is said to be in this state when it is at an attractive critical point at which it behaves as in a phase transition (i.e., the spatial and temporal scales are scale-invariant, or nearly so). | ||
In magnetically confined plasmas, this state is thought to be responsible for the global transport phenomena of ''profile consistency'' and ''power degradation''. Profile consistency is the observation that profiles tend to have roughly the same shape, regardless of the power and location of the applied heating. | In magnetically confined plasmas, this state is thought to be responsible for the global transport phenomena of ''profile consistency'', the ''Bohm scaling'' of confinement (in L-mode), and ''power degradation''. Profile consistency is the observation that profiles tend to have roughly the same shape, regardless of the power and location of the applied heating. | ||
<ref>[http://dx.doi.org/10.1088/0741-3335/43/12A/325 F. Ryter et al., Plasma Phys. Control. Fusion '''43''', A323 (2001)]</ref> | <ref>[http://dx.doi.org/10.1088/0741-3335/43/12A/325 F. Ryter et al., Plasma Phys. Control. Fusion '''43''', A323 (2001)]</ref> | ||
Power degradation shows up in global transport scaling laws, and implies a sub-linear scaling of the plasma energy content with the injected power. | Power degradation shows up in global transport scaling laws, and implies a sub-linear scaling of the plasma energy content with the injected power. | ||