title: Single element of the matrix source of negative hydrogen ions: Measurements of the extracted currents combined with diagnostics.
abstract: Combining measurements of the extracted currents with probe and laser-photodetachment diagnostics, the study is an extension of recent tests of factors and gas-discharge conditions stimulating the extraction of volume produced negative ions. The experiment is in a single element of a rf source with the design of a matrix of small-radius inductively driven discharges. The results are for the electron and negative-ion densities, for the plasma potential and for the electronegativity in the vicinity of the plasma electrode as well as for the currents of the extracted negative ions and electrons. The plasma-electrode bias and the rf power have been varied. Necessity of a high bias to the plasma electrode and stable linear increase of the extracted currents with the rf power are the main conclusions.
authors.affiliation: Faculty of Physics, Sofia University, BG-1164 Sofia, Bulgaria.
authors.forename: D
authors.initials: D
authors.lastname: Yordanov
authors.affiliation: Faculty of Physics, Sofia University, BG-1164 Sofia, Bulgaria.
authors.forename: St
authors.initials: S
authors.lastname: Lishev
authors.affiliation: Faculty of Physics, Sofia University, BG-1164 Sofia, Bulgaria.
authors.forename: A
authors.initials: A
authors.lastname: Shivarova