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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.

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slide1

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

slide2

Section 8:

  • Reciprocating Langmuir Probe @ Midplane
  • Fast stroke ~100 mm in ~100 ms
  • Slow positioning between shots
slide3

Shot #20228 at 1.7 s

D1 /ELMa-Han

D2 /ELMi-Han

slide4

Isat_ur

Ufl_ul

Ufl_ul

Ufl_m

swept

Five-pin probe head @MEM used for fluctuation measurements.

Bt

Br

  • Ion saturation current
  • Floating potentials
  • Reynolds stress
  • Fluctuation-Induced particle flux

Ip

Bpol

2MHz Sampling Frequency

slide5

Distances between the probe head and the Separatrix:

H-mode shot

#20228 ~5 cm

Limiter plasma shot ( no ELMs)

#20233 ~8 cm

Probe head pops ~5 mm in front of the ICRH Limiter

slide6

#20228

Strokes @ 1.5, 2.7, 4.0

Data analysis

slide7

I

I

[A]

A. Loarte et al., Phys. Plasma 11, 2668-2678 (2004).

slide8

[m-2s-1]

Re [m2s-2]

slide10

#20228

  • H-mod
  • 4 cumulative ELMs

PDF (Γ)

Γ/std(Γ)

conclusions
Conclusions
  • Work is in progress comparing the experimental results with the ESEL 2D turbulence code.
  • We observed cross coherence of the particle flux and the Reynolds stress.
  • Correlations with other SOL diagnostics are to be done.
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