0461459 - ÚFP 2017 RIV BG eng O - Others
Hasan, E. - Dimitrova, Miglena - Havlíček, Josef - Bogár, Klára - Stöckel, Jan - Varju, Jozef - Weinzettl, Vladimír - Popov, Tsv.K. - Komm, Michael - Dejarnac, Renaud - Háček, Pavel - Pánek, Radomír
ELECTRON ENERGY DISTRIBUTION FUNCTION IN DIVERTOR REGION OF THE COMPASS TOKAMAK DURING NEUTRAL BEAM INJECTION HEATING (IWSSPP2016).
2016
R&D Projects: GA MŠMT(CZ) LM2015045; GA ČR(CZ) GA16-25074S
EU Projects: European Commission(XE) 633053 - EUROfusion
Institutional support: RVO:61389021
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

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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.

Permanent Link: http://hdl.handle.net/11104/0261090