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Title: Negative ion production in the RF multiaperture surface-plasma source

The experiments on negative hydrogen ion beam production in a multi-aperture long-pulse surface-plasma source are described. H- ions are produced on the surface of a plasma grid covered by cesium and illuminated by fast plasma particles. The source uses a radio-frequency driver to generate plasma. A composite magnet system made of external permanent magnets confines and filters electrons in the plasma region, and deflects them in the extraction area. A multiaperture, multi-electrode ion optical system is used for beam formation. The electrode heating and cooling during long pulses is accomplished by circulating a heat transfer fluid through channels drilled in the electrodes bodies. H- ions extraction through a single aperture and 21 apertures was performed and studied. A stable H- beam with the current up to 0.7 A, energy up to 74 kV, and pulse duration up to 7 s was routinely obtained.
Authors:
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  1. Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)
  2. (Russian Federation)
  3. Tri Alpha Energy Inc., Rancho Santa Margarita, CA 92688 (United States)
Publication Date:
OSTI Identifier:
22391425
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1655; Journal Issue: 1; Conference: NIBS 2014: 4. International Symposium on Negative Ions, Beams and Sources, Garching (Germany), 6-10 Oct 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; APERTURES; BEAM CURRENTS; BEAM PRODUCTION; CESIUM; COOLING; ELECTRONS; HEAT TRANSFER FLUIDS; HEATING; HYDROGEN IONS 1 MINUS; ION BEAMS; MAGNETIC CONFINEMENT; MAGNETIC FILTERS; OPTICAL SYSTEMS; PERMANENT MAGNETS; PLASMA; RADIOWAVE RADIATION; SURFACES