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VERSION:2.0
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SUMMARY:Spectroscopic measurements and modelling of plasma flows in the HF
 S SOL of ASDEX Upgrade
DTSTART:20170821T103000
DTEND:20170821T113000
DTSTAMP:20260502T005317Z
UID:76adf75e90ca17ffb81a43d7153918ffd57e7e68215dfda47dfe2e86
CATEGORIES:Conferences - Seminars
DESCRIPTION:Juuso Karthunen - Aalto University\, Department of Applied Phy
 sics\, Finland\nKnowledge on scrape-off layer flows on the high-field side
  is essential in understanding migration of eroded impurities  from the m
 ain chamber wall to the inner divertor. In this work\, HFS SOL flows have 
 been measured spectroscopically in ASDEX Upgrade\, and the physical phenom
 ena behind the observations have been studied by SOLPS 5.0 modelling.\nInd
 irect flow measurements were performed during L-mode discharges with the i
 nner divertor ranging from high-recycling to detached conditions by Dopple
 r spectroscopy of injected N+ ions. The results indicated reversal of the 
 toroidal near-SOL flow in high-recycling conditions\, while the reversal d
 isappeared after detachment of the inner divertor. The poloidal flow compo
 nent was always directed away from the inner divertor close to the separat
 rix\, suggesting a dominant contribution of the Er×B drift.\nThe behaviou
 r of the D+ flow in the HFS SOL was studied by a density and power scan in
  SOLPS 5.0. In the near SOL\, the results of the D+ flows were consistent 
 with the experimental observations of the N+ flows\, showing reversal in h
 igh-recycling conditions. The near SOL flow showed strong correlation with
  the poloidal pressure asymmetries between the HFS and LFS\, driven mainly
  by the ÑB×B drift above the X point on the HFS and emphasized by locali
 zed ionization in the near SOL in high-recycling conditions. In the far SO
 L\, the flow direction was strongly affected by radial transport of the pl
 asma flowing on the inner flux surfaces.
LOCATION:PPB019
STATUS:CONFIRMED
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