Optimized versions of surface plasma negative ion sources
- Budker Inst. of Nuclear Physics, Novosibirsk (Russian Federation)
- Oak Ridge National Lab., TN (United States)
The features of improved versions of surface plasma sources (SPS) with cesium catalysis for negative ion production are discussed. The advantages of semiplanotron SPS with drift of thin layer high dense plasma in crossed fields and hot cathode discharge SPS with magnetic field and low gas density have joint in optimized configuration. Close discharge configuration have a Penning multicharge ion source with sputtered electrode opposite an emission slit. The form of emitter surface should be optimized for low aberration geometrical focusing of secondary negative ion to the emission hole in magnetic field. Supersonic jet of atoms, crossed emission hole, will be used for deep cooling of negative ion flux with big energy spread from emitter by resonant charge-exchange with cold atoms of jet. Fast pumping of atoms directly in source chamber will keep low gas density and low destruction of negative ions. Intense beams of hydrogen isotopes with temperature lass 1 eV and emission current density up to 1 A/cm can be reached in continuously operated SPS with cylindrical emitter and emission slit parallel to the magnetic field. Similar configuration is adequate as efficient ionizer for nuclear polarized negative ion beam production from low energy polarized atoms after sextupole focusing, optical pumping, or supercold accumulator. Close to figuration of SPS is good for heavy negative ion production.
- OSTI ID:
- 153908
- Report Number(s):
- CONF-950612-; ISBN 0-7803-2669-5; TRN: 96:001520
- Resource Relation:
- Conference: 22. international conference on plasma science, Madison, WI (United States), 5-8 Jun 1995; Other Information: PBD: 1995; Related Information: Is Part Of IEEE conference record -- abstracts: 1995 IEEE international conference on plasma science; PB: 312 p.
- Country of Publication:
- United States
- Language:
- English
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