Number of the records: 1
ELECTRON ENERGY DISTRIBUTION FUNCTION IN DIVERTOR REGION OF THE COMPASS TOKAMAK DURING NEUTRAL BEAM INJECTION HEATING (IWSSPP2016)
- 1.
SYSNO ASEP 0461459 Document Type O - Others R&D Document Type Others Title ELECTRON ENERGY DISTRIBUTION FUNCTION IN DIVERTOR REGION OF THE COMPASS TOKAMAK DURING NEUTRAL BEAM INJECTION HEATING (IWSSPP2016) Author(s) Hasan, E. (BG)
Dimitrova, Miglena (UFP-V) ORCID
Havlíček, Josef (UFP-V) RID, ORCID
Bogár, Klára (UFP-V) ORCID
Stöckel, Jan (UFP-V) RID
Varju, Jozef (UFP-V) ORCID
Weinzettl, Vladimír (UFP-V) RID, ORCID
Popov, Tsv.K. (BG)
Komm, Michael (UFP-V) RID, ORCID
Dejarnac, Renaud (UFP-V) RID, ORCID
Háček, Pavel (UFP-V) RID, ORCID
Pánek, Radomír (UFP-V) RIDYear of issue 2016 Language eng - English Country BG - Bulgaria Keywords neutral beam injection heating ; 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) GA16-25074S 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 presents the results from the swept probe measurements in the divertor region of the COMPASS tokamak in D-shaped, L-mode discharges, with toroidal magnetic field BT = - 1.15 T, plasma current Ip = -180 kA and varying line-average electron densities from 2 to 8x1019 m-3. Using the neutral beam injection (NBI) heating, the electron energy distribution function (EEDF) was studied before and during the application of the beam. The current-voltage characteristics data were processed using the novel first-derivative probe technique (FDPT). This technique allows to evaluate the plasma potential and the EEDF (respectively the electron temperatures and densities).
At low average electron density of 2x1019 m-3 the EEDF is bi-Maxwellian with low-energy electron population with temperatures 4-6 eV and high energy electron group 12-25 eV. With increasing the line-average electron density the electron temperatures decrease. Above 7x1019 m-3 line-average electron density the EEDF is found to be a Maxwellian with temperature 6-8.5 eV.
The dependence of the NBI heating power in divertor region was studied.
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