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When a magnetically confined plasma is heated strongly and a threshold heating power level is exceeded, it may spontaneously transition from a low confinement (or L-mode) state to a high confinement (or H-mode) state. | When a magnetically confined plasma is heated strongly and a threshold heating power level is exceeded, it may spontaneously transition from a low confinement (or [[L-mode]]) state to a high confinement (or H-mode) state. | ||
<ref>F. Wagner et al, ''Development of an Edge Transport Barrier at the H-Mode Transition of ASDEX'', [[doi:10.1103/PhysRevLett.53.1453|Phys. Rev. Lett. '''53''' (1984) 1453 - 1456]]</ref> | <ref>F. Wagner et al, ''Development of an Edge Transport Barrier at the H-Mode Transition of ASDEX'', [[doi:10.1103/PhysRevLett.53.1453|Phys. Rev. Lett. '''53''' (1984) 1453 - 1456]]</ref> | ||
In the H-mode, the [[Energy confinement time|energy confinement time]] is significantly enhanced, i.e., typically by a factor of 2 or more. | In the H-mode, the [[Energy confinement time|energy confinement time]] is significantly enhanced, i.e., typically by a factor of 2 or more. | ||