Investigation of Fluctuations in the SOL of ASDEX Upgrade by Langmuir Probes.
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Investigation of Fluctuations in the SOL
of ASDEX Upgrade by Langmuir Probes
P. Balan,aF. Mehlmann,a S.J. Konzett,a A. Kendl,aA. Herrmann,bC. Ioniţă,a M. Maraschek,b H.W. Müller,b O.E. Garcia,c V. Naulin,c A.H. Nielsen,c V. Rohde,b J.J. Rasmussen,c R. Schrittwieser,aand the ASDEX Upgrade Teamb
aAssociation EURATOM-ÖAW, Institute for Ion Physics and Applied Physics, Leopold-Franzens University of Innsbruck, Austria, bAssociation EURATOM-IPP Garching, ASDEX Upgrade Group, Garching, GermanycAssociation EURATOM-Risø National Laboratory, OPL-128, Risø, Roskilde, Denmark
Shot #20228 at 1.7 s
Five-pin probe head @MEM used for fluctuation measurements.
2MHz Sampling Frequency
Distances between the probe head and the Separatrix:
#20228 ~5 cm
Limiter plasma shot ( no ELMs)
#20233 ~8 cm
Probe head pops ~5 mm in front of the ICRH Limiter
Strokes @ 1.5, 2.7, 4.0
A. Loarte et al., Phys. Plasma 11, 2668-2678 (2004).
ρ = ΓRe / sqrt( <Γ2><Re2> )
Time lag [s]