Model for the stationary cesium coverage on a converter surface in a cesium seeded hydrogen discharge

Journal Article · Sun Sep 15 04:00:00 EDT 1985 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.335953· OSTI ID:5351024

van Amersfoort, P W; Tong, Y C; Granneman, E H.A.

A model is presented for the mechanism which establishes the dynamic equilibrium cesium coverage on a W(110) converter surface in the discharge chamber of a negative hydrogen ion source. The charge state of cesium particles arriving at the converter surface is found to be a crucial parameter. A coverage greater than 0.26 monolayers cannot be maintained if the cesium component is highly ionized. The corresponding negative hydrogen ion formation probability is far from optimum. This situation is probably present in all high-density surface conversion negative ion sources employed nowadays.

• Research Organization: Association EURATOM-FOM, FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
• OSTI ID: 5351024
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 58:6; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ADSORPTION
CESIUM IONS
CHARGED PARTICLES
COLLISIONS
DEPOSITION
ELEMENTS
HYDROGEN IONS
ION COLLISIONS
ION SOURCES
IONS
MATHEMATICAL MODELS
METALS
PLASMA
SORPTION
SPUTTERING
TRANSITION ELEMENTS
TUNGSTEN