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Pedestal: Difference between revisions
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In the context of magnetic confinement fusion, the term ''pedestal'' refers to a relatively narrow edge plasma region with significantly enhanced profile gradients, identified with an edge transport barrier, characteristic of the [[H-mode]]. | [[File:H-mode.png|300px|thumb|right|Sketch of L- and H-mode profiles and pedestal.]] | ||
In the context of magnetic confinement fusion, the term ''pedestal'' refers to a relatively narrow edge plasma region with significantly enhanced (pressure) profile gradients, identified with an edge transport barrier, characteristic of the [[H-mode]]. | |||
<ref>[http://dx.doi.org/10.1088/0029-5515/29/11/010 ASDEX Team, ''The H-Mode of ASDEX'', Nucl. Fusion '''29''' (1989) 1959]</ref> | <ref>[http://dx.doi.org/10.1088/0029-5515/29/11/010 ASDEX Team, ''The H-Mode of ASDEX'', Nucl. Fusion '''29''' (1989) 1959]</ref> | ||
When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology. | When transiting from the L-mode to the H-mode, the appearance of the pedestal often leaves the profile gradients in the core region intact (due to [[Profile consistency|profile consistency]]) whereas the edge gradients increase sharply. Thus, it appears as if the core profiles are merely shifted upward (as if put upon a pedestal), hence the terminology. | ||