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1. Direct observations of L-I-H and H-I-L transitions with the X-point reciprocating probe in ASDEX Upgrade

Author

Mueller, S.H., Conway, G.D., Birkenmeier, G., Carralero, D., Happel, T., Herrmann, A., Manz, P., de Marne, P., Mlynek, A., Müller, H.W., Potzel, S., Rohde, V., Stroth, U., Tsalas, M., Tynan, G.R., Wolfrum, E., Team, ASDEXUpgrade, and ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society

Subjects
Physics, symbols.namesake, Toroid, ASDEX Upgrade, Mach number, Turbulence, Divertor, Phase (waves), symbols, Electron temperature, Langmuir probe, Atomic physics, Condensed Matter Physics
Abstract

A reciprocating Langmuir probe was used to directly measure the behavior of turbulence and flows in the X-point region during transitions between low-(L) and high-confinement (H) mode in ASDEX Upgrade. The probe traverses the divertor horizontally in 140 ms, typically 2–5 cm below the X-point. Toroidal Mach number, density, floating potential (ϕf), and electron temperature (Te) are measured. In the regime accessible to the probe (Pinj

Published
2014

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