Investigation of Fluctuations in the SOL
This presentation is the property of its rightful owner.
Sponsored Links
1 / 12

Investigation of Fluctuations in the SOL of ASDEX Upgrade by Langmuir Probes PowerPoint PPT Presentation


  • 45 Views
  • Uploaded on
  • Presentation posted in: General

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

Download Presentation

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

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Investigation of fluctuations in the sol of asdex upgrade by langmuir probes

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


Investigation of fluctuations in the sol of asdex upgrade by langmuir probes

  • Section 8:

  • Reciprocating Langmuir Probe @ Midplane

  • Fast stroke ~100 mm in ~100 ms

  • Slow positioning between shots


Investigation of fluctuations in the sol of asdex upgrade by langmuir probes

Shot #20228 at 1.7 s

D1 /ELMa-Han

D2 /ELMi-Han


Investigation of fluctuations in the sol of asdex upgrade by langmuir probes

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


Investigation of fluctuations in the sol of asdex upgrade by langmuir probes

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


Investigation of fluctuations in the sol of asdex upgrade by langmuir probes

#20228

Strokes @ 1.5, 2.7, 4.0

Data analysis


Investigation of fluctuations in the sol of asdex upgrade by langmuir probes

I

I

[A]

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


Investigation of fluctuations in the sol of asdex upgrade by langmuir probes

[m-2s-1]

Re [m2s-2]


Investigation of fluctuations in the sol of asdex upgrade by langmuir probes

ρ = ΓRe / sqrt( <Γ2><Re2> )

Time lag [s]


Investigation of fluctuations in the sol of asdex upgrade by langmuir probes

  • #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.


  • Login