Journal
CONTRIBUTIONS TO PLASMA PHYSICS
Volume 54, Issue 3, Pages 279-284Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ctpp.201410072
Keywords
Tokamak; ball-pen probe; emissive probe; L-mode; plasma potential
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Funding
- EURATOM Association IPP.CR
- Grant Agency of Czech Republic [GA CR P205/12/2327]
- Austrian Science Fund (FWF) [L302-N02, P19901-N20]
- EURATOM Association IPP
- EURATOM Association OAW
- LM2010005
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Experimental investigations of the plasma potential by means of a ball-pen probe and self-emitting Langmuir probe technique were performed on the tokamaks COMPASS and ASDEX Upgrade. A spontaneous transition between the cold and self-emitting Langmuir probe has been observed during the deep reciprocation in the vicinity or even inside the last closed flux surface (LCFS) of both tokamaks. These measurements of the plasma potential allow us to compare two independent probe techniques based on heating and non-heating processes. The observed different conditions of the spontaneous transition can be ascribed to different physical mechanisms. Nevertheless, the comparison of the power spectra of ball-pen probe and self-emitting Langmuir probe indicates very good agreement in all measurements and therefore these two probe techniques are interchangeable. ((c) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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