title: Improving efficiency of negative ion production in ion source with saddle antenna.
abstract: Extraction of negative ions from a saddle antenna radio-frequency surface plasma source is considered. Several versions of new plasma generators with different antennas and magnetic field configurations were tested in the smal Oak Ridge National Laboratory Spallation Neutron Source Test Stand. The efficiency of positive ion generation in plasma has been improved to 200 mA/cm(2) kW from 2.5 mA/cm(2) kW. A small oven was developed for cesiation by cesium compounds and alloy decomposition. After cesiation, a current of negative ions to the collector was increased from 1 mA to 10 mA with 1.5 kW RF power in the plasma and longitudinal magnetic field Bl ∼ 250 G. The specific efficiency of H(-) production was increased to 20 mA/cm(2) kW from 2.5 mA/cm(2) kW.
authors.affiliation: Muons, Inc., Batavia, Illinois 60510, USA.
authors.forename: V
authors.initials: V
authors.lastname: Dudnikov
authors.affiliation: Muons, Inc., Batavia, Illinois 60510, USA.
authors.forename: R P
authors.initials: RP
authors.lastname: Johnson
authors.affiliation: ORNL, Oak Ridge, Tennessee 37831, USA.
authors.forename: S
authors.initials: S
authors.lastname: Murrey
authors.affiliation: ORNL, Oak Ridge, Tennessee 37831, USA.
authors.forename: T
authors.initials: T
authors.lastname: Pinnisi
authors.affiliation: ORNL, Oak Ridge, Tennessee 37831, USA.
authors.forename: C
authors.initials: C
authors.lastname: Piller
authors.affiliation: ORNL, Oak Ridge, Tennessee 37831, USA.
authors.forename: M
authors.initials: M
authors.lastname: Santana
authors.affiliation: ORNL, Oak Ridge, Tennessee 37831, USA.
authors.forename: M
authors.initials: M
authors.lastname: Stockli
authors.affiliation: ORNL, Oak Ridge, Tennessee 37831, USA.
authors.forename: R
authors.initials: R
authors.lastname: Welton
authors.affiliation: Physics Department, Wisconsin University of Madison, Wisconsin 53706, USA.
authors.forename: C
authors.initials: C
authors.lastname: Johnson
authors.affiliation: Engineering Department, University of Florida, Gainesville, Florida 32611, USA.
authors.forename: M
authors.initials: M
authors.lastname: Turvey