Improving efficiency of negative ion production in ion source with saddle antenna

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 e...

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Bibliographic Details
Published in:Review of scientific instruments 2014-02, Vol.85 (2), p.02B111-02B111
Main Authors: Dudnikov, V, Johnson, R P, Murrey, S, Pinnisi, T, Piller, C, Santana, M, Stockli, M, Welton, R, Johnson, C, Turvey, M
Format: Article
Language:English
Subjects:
ALLOYS
ANIONS
ANTENNAS
CATIONS
CESIUM COMPOUNDS
EXTRACTION
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
NEUTRON SOURCES
ORNL
OVENS
PARTICLE ACCELERATORS
PLASMA
PLASMA PRODUCTION
RADIOWAVE RADIATION
SPALLATION
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Summary: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.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.4833021