Effect of primary electron drift on the negative ion efficiency of a volume hybrid multicusp H[sup [minus]] ion source

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

OSTI ID:6693494

Courteille, C; Bruneteau, J; Valckx, F P.G.; Sledziewski, Z; Bacal, M ^[1]

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1. Laboratoire de Physique des Milieux Ionises, Laboratoire du CNRS, Ecole Polytechnique, 91128 Palaiseau Cedex (France)

A new, large, hybrid volume negative ion source is described. Observations of curvature and [ital grad] [ital B] primary electron drift in the multicusp magnetic field are reported. The direction of the electron drift changes from one filament to the neighboring one, because of the change in the direction of the magnetic field. For a given discharge current the extracted negative ion current and the plasma density at the center of the extraction region are affected by the direction of the primary electron drift of the active filaments. It was shown, however, that the negative ion current is controlled by the plasma density at the center of the extraction region. A trajectory calculation, effected in the guiding center approximation, allows to estimate the average drift velocity.

• OSTI ID: 6693494
• 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
ANIONS
BEAM CURRENTS
BEAMS
CHARGED PARTICLES
CURRENTS
DESIGN
ELECTRON DRIFT
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
ION BEAMS
ION DENSITY
ION SOURCES
IONS
MAGNETIC FIELD CONFIGURATIONS
Ta
Targets-- (1992-)