title: Spatial distribution of the plasma parameters in a radio-frequency driven negative ion source.
abstract: Results from initial stage of modeling of the SPIDER source of negative hydrogen/deuterium ions currently under development in Consorzio RFX (Padova) regarding ITER are presented. A 2D model developed within the fluid plasma theory for low-pressure discharges (free-fall regime maintenance) is applied to the gas-discharge conditions planned and required for the SPIDER source: gas pressure of 0.3 Pa and radio-frequency (rf) power of 100 kW absorbed in a single driver. The results are for the spatial distribution of the plasma characteristics (charged particle densities, electron temperature and electron energy flux, plasma potential, and dc electric field) with conclusions for the role of the electron energy flux in the formation of the discharge structure.
authors.affiliation: Faculty of Physics, Sofia University, 5 J. Bourchier Blvd., Sofia BG-1164, Bulgaria.
authors.forename: D
authors.initials: D
authors.lastname: Todorov
authors.affiliation: Department of Applied Physics, Technical University-Sofia, 8 Kl. Ohridski Blvd., Sofia BG-1000, Bulgaria.
authors.forename: Kh
authors.initials: Kh
authors.lastname: Tarnev
authors.affiliation: Faculty of Physics, Sofia University, 5 J. Bourchier Blvd., Sofia BG-1164, Bulgaria.
authors.forename: Ts
authors.initials: Ts
authors.lastname: Paunska
authors.affiliation: Faculty of Physics, Sofia University, 5 J. Bourchier Blvd., Sofia BG-1164, Bulgaria.
authors.forename: St
authors.initials: S
authors.lastname: Lishev
authors.affiliation: Faculty of Physics, Sofia University, 5 J. Bourchier Blvd., Sofia BG-1164, Bulgaria.
authors.forename: A
authors.initials: A
authors.lastname: Shivarova