Emittance growth in negative ion beam formation: Effects due to secondary positive ions on the extraction sheath

Conference · Mon Oct 05 04:00:00 EDT 1992 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:5418935

Cowan, R G; Niemel, J; Campbell, R L; Raridon, R J; Whealton, J H ^[1]; Michaut, C; Bacal, M ^[2]

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1. Oak Ridge National Laboratory, Oak Ridge, Tennessee 378931 (United States)
2. Laboratoire du C. N. R. S., Ecole Polytechnique, 91128 Palaiseau (France)

The experimentally measured dependence upon the acceleration voltage of the negative ion current intercepted on a Faraday Cup is compared to theoretical computations. It is shown that the secondary positive ions generated within the electron suppression electrode and accelerated into the plasma source, have a significant effect on the plasma extraction sheath and presheath potentials and explain the experimental data.

• OSTI ID: 5418935
• Report Number(s): CONF-921145--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 287:1
• Country of Publication: United States
• Language: English

Related Subjects

661220* -- Particle Beam Production & Handling
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BEAM EXTRACTION
BEAM MONITORING
BEAM MONITORS
BEAMS
DATA
DESIGN
EMISSION
FARADAY CUPS
INFORMATION
ION BEAMS
MEASURING INSTRUMENTS
MONITORING
MONITORS
NUMERICAL DATA
SECONDARY EMISSION
THEORETICAL DATA
Ta
Targets-- (1992-)