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

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. Toroi...

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Bibliographic Details
Published in:Physics of plasmas 2014-04, Vol.21 (4)
Main Authors: Müller, S. H., Conway, G. D., Birkenmeier, G., Carralero, D., Happel, T., Herrmann, A., Manz, P., de Marné, P., Mlynek, A., Müller, H. W., Potzel, S., Rohde, V., Stroth, U., Tsalas, M., Tynan, G. R., Wolfrum, E.
Format: Article
Language:English
Subjects:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ASDEX TOKAMAK
Broadband
Density
Electron energy
Fluid dynamics
H-MODE PLASMA CONFINEMENT
L-MODE PLASMA CONFINEMENT
LANGMUIR PROBE
Limit cycle oscillations
MACH NUMBER
Phase transitions
Plasma physics
PLASMA POTENTIAL
PLASMA SCRAPE-OFF LAYER
PULSES
Turbulence
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Summary: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
ISSN:1070-664X
1089-7674
DOI:10.1063/1.4870012