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Fast measurement of plasma potential, temperature and density in theSOL of ASDEX Upgrade, compared with ESEL simulation
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SYSNO ASEP 0352069 Document Type A - Abstract R&D Document Type The record was not marked in the RIV R&D Document Type Není vybrán druh dokumentu Title Fast measurement of plasma potential, temperature and density in theSOL of ASDEX Upgrade, compared with ESEL simulation Author(s) Horáček, Jan (UFP-V) RID, ORCID
Adámek, Jiří (UFP-V) RID, ORCID
Müller, H. W. (DE)
Seidl, Jakub (UFP-V) RID
Nielsen, A.H. (DK)
Rohde, V. (DE)
Mehlmann, F. (AT)
Ionita, C. (AT)
Havlíčková, Eva (UFP-V)Source Title 3rd EFDA Transport Topical Group Meeting combined with 15th EU-US Transport Task Force Meeting. - Garching : Max Planck Society, 2010
O2.03-O2.03Number of pages 1 s. Publication form web - web Action EFDA Transport Topical Group Meeting combined with 15th EU-US Transport Task Force Meeting/3rd./ Event date 07.10.2010-10.10.2010 VEvent location Cordoba Country ES - Spain Event type WRD Language eng - English Country DE - Germany Keywords Tokamak ; plasma ; SOL turbulence ; ESEL Subject RIV BL - Plasma and Gas Discharge Physics CEZ AV0Z20430508 - UFP-V (2005-2011) Annotation This contribution focuses on fast (1 μs) and local (2-4 mm) measurement of plasma density, potential and electron temperature in the edge plasma of tokamak ASDEX Upgrade. The measurements were performed by a combined Langmuir/Ball-pen probe. First, steady-state radial profiles demonstrate 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 4 mm wide decrease by 10% at the very center 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
Number of the records: 1