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Interpretation of fast measurements of plasma potential, temperature and density in SOL of ASDEX Upgrade
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SYSNO ASEP 0348681 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Interpretation of fast measurements of plasma potential, temperature and density in SOL of ASDEX Upgrade Author(s) Horáček, Jan (UFP-V) RID, ORCID
Adámek, Jiří (UFP-V) RID, ORCID
Müller, H. W. (DE)
Seidl, J. (CZ)
Nielsen, A.H. (DK)
Rohde, V. (DE)
Mehlmann, F. (AT)
Ionita, C. (AT)
Havlíčková, Eva (UFP-V)Source Title Nuclear Fusion. - : Institute of Physics Publishing - ISSN 0029-5515
Roč. 50, č. 10 (2010), s. 105001-105001Number of pages 9 s. Publication form web - web Language eng - English Country AT - Austria Keywords Ball-pen probe ; Langmuir probe ; tokamak ; plasma ; SOL ; turbulence ; blob ; interchange instability ; ASDEX Upgrade Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects KJB100430901 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) GA202/09/1467 GA ČR - Czech Science Foundation (CSF) 7G09042 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) CEZ AV0Z20430508 - UFP-V (2005-2011) UT WOS 000281859300002 DOI 10.1088/0029-5515/50/10/105001 Annotation This paper focuses on interpretation of fast (1μs) and local (2–4 mm) measurements of plasma density, potential and electron temperature in the edge plasma of tokamak ASDEX Upgrade. Steady-state radial profiles demonstrate the credibility of the ball-pen probe. We demonstrate that floating potential fluctuations measured by a Langmuir probe are dominated by plasma electron temperature rather than potential. Spatial and temporal scales are found consistent with expectations based on interchange-driven turbulence. Conditionally averaged signals found for both potential and density are also consistent; however, those for temperature show an unexpected ~4mm wide decrease by 10% at the very centre of a blob. In the wall shadow, temperature measured by the swept Langmuir probe yields values ~10 eV, whilst the ball-pen temperature gradient is more steep and credible, dropping down to ~1 eV. Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2011
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