The relation of edge confinement to global confinement in ASDEX Upgrade (axially symmetric divertor experiment)
Experimental evidence is presented from the Axially Symmetric Divertor Experiment (ASDEX Upgrade) tokamak of a robust relation between the edge radial pressure gradient and the global confinement of the plasma. This not only includes H-modes discharges, but discharges of many types in ASDEX Upgrade. Focused on here is the region just inside the separatrix, in the confined plasma, which in H-mode discharges is referred to as the transport barrier or as the pedestal region. This relation transcends the power flowing across flux surfaces near the edge and thus suggests that the usual model of cross-field heat transport, where local gradients increase with increasing local power flow, is not appropriate.
Bibliographic Reference: Article: Physics of Plasmas, Vol. 4 (1997) No.7, pp. 2577-2583
Record Number: 199711299 / Last updated on: 1997-10-10
Original language: en
Available languages: en