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Investigation of Fluctuations in the SOL of ASDEX Upgrade by Langmuir Probes

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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  1. 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

  2. Section 8: • Reciprocating Langmuir Probe @ Midplane • Fast stroke ~100 mm in ~100 ms • Slow positioning between shots

  3. Shot #20228 at 1.7 s D1 /ELMa-Han D2 /ELMi-Han

  4. 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

  5. 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

  6. #20228 Strokes @ 1.5, 2.7, 4.0 Data analysis

  7. I I [A] A. Loarte et al., Phys. Plasma 11, 2668-2678 (2004).

  8. [m-2s-1] Re [m2s-2]

  9. ρ = ΓRe / sqrt( <Γ2><Re2> ) Time lag [s]

  10. #20228 • H-mod • 4 cumulative ELMs PDF (Γ) Γ/std(Γ)

  11. 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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