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EFFECT OF THE RESONANT MAGNETIC PERTURBATION ON THE PLASMA PARAMETERS IN DIVERTOR REGION OF THE COMPASS TOKAMAK (IWSSPP 2016)
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SYSNO ASEP 0461460 Document Type O - Others R&D Document Type Others Title EFFECT OF THE RESONANT MAGNETIC PERTURBATION ON THE PLASMA PARAMETERS IN DIVERTOR REGION OF THE COMPASS TOKAMAK (IWSSPP 2016) Author(s) Dimitrova, Miglena (UFP-V) ORCID
Cahyna, Pavel (UFP-V) RID
Popov, Tsv.K. (BG)
Hasan, E. (BG)
Ivanova, P. (BG)
Markovič, Tomáš (UFP-V) RID
Peterka, Matěj (UFP-V) RID, ORCID
Stöckel, Jan (UFP-V) RID
Dejarnac, Renaud (UFP-V) RID, ORCID
Imríšek, Martin (UFP-V) RID
Háček, Pavel (UFP-V) RID, ORCID
Havlíček, Josef (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RIDYear of issue 2016 Language eng - English Country BG - Bulgaria Keywords Resonant Magnetic Perturbations ; plasma potential ; electron energy distribution function ; electron temperatura and density ; first-derivative probe technique Subject RIV BL - Plasma and Gas Discharge Physics R&D Projects LM2015045 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA16-24724S GA ČR - Czech Science Foundation (CSF) Institutional support UFP-V - RVO:61389021 Annotation Předneseno na: 7th International Workshop and Summer School on Plasma Physics (IWSSPP 2016), Kiten,26.06.-02.07.2016,
This work discusses the application of Resonant Magnetic Perturbations (RMPs) in the COMPASS tokamak in Ohmic D-shaped discharges, with toroidal magnetic field BT = 1.15 T, plasma current Ip = 170 kA and line-average electron density ne = 5×1019 m−3. In order to study the effect of RMPs on the plasma parameters in the divertor region with high spatial resolution, the strike-points were swept radially across 39 Langmuir divertor probes during a shot. The current-voltage characteristics data were processed using the novel first-derivative probe technique which allows one to evaluate the plasma potential and the real electron energy distribution function (EEDF), respectively the electron temperatures and densities. It has been found that in the vicinity of the inner and outer strike points of the divertor, that EEDF is bi-Maxwellian, with a low-energy electron population (4 - 6 eV) and a higher energy one (10 - 30 eV).
When applying RMPs with alternate directions of the current in the external coils, we observed splitting of strike points characterized by change of spatial profiles of the floating potential and the ion saturation current at the outer strike point
Workplace Institute of Plasma Physics Contact Vladimíra Kebza, kebza@ipp.cas.cz, Tel.: 266 052 975 Year of Publishing 2017
Number of the records: 1