Further study on a magnetically filtered multicusp ion source

Journal Article · Wed Sep 01 00:00:00 EDT 1982 · Rev. Sci. Instrum.; (United States)

DOI:https://doi.org/10.1063/1.1137189· OSTI ID:5079965

Ehlers, K W; Leung, K N

An optimized permanent magnet filter geometry has been determined for a multicusp ion source operated with hydrogen gas. By applying a negative bias potential to the plasma grid, energetic secondary electrons are produced which can generate molecular hydrogen ions in the extraction chamber and thus reduce the H/sup +/ ion fraction in the extracted beam. Both the atomic species percentage and the ion current density can be improved by the addition of 16-eV electrons into the extraction chamber. It is also observed that once started, the discharge can be maintained with only the extraction chamber and the plasma grid acting as the anode. Thus the total discharge current can pass through the filter in the form of cold electrons.

• Research Organization: Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5079965
• Journal Information: Rev. Sci. Instrum.; (United States), Journal Name: Rev. Sci. Instrum.; (United States) Vol. 53:9; ISSN RSINA
• Country of Publication: United States
• Language: English

Related Subjects

640301* -- Atomic
Molecular & Chemical Physics-- Beams & their Reactions
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANODES
CHARGED PARTICLES
CURRENT DENSITY
CURRENTS
CUSPED GEOMETRIES
DATA
ELECTRIC CURRENTS
ELECTRIC DISCHARGES
ELECTRODES
ELECTRON TEMPERATURE
ELECTRONS
ELEMENTARY PARTICLES
ELEMENTS
EMISSION
ENERGY RANGE
EV RANGE
EXPERIMENTAL DATA
FERMIONS
FILTERS
GRIDS
HYDROGEN
HYDROGEN IONS
INFORMATION
ION SOURCES
IONS
LEPTONS
MAGNETIC FIELD CONFIGURATIONS
MAGNETS
MOLECULES
NONMETALS
NUMERICAL DATA
OPEN CONFIGURATIONS
OPTIMIZATION
PERMANENT MAGNETS
PLASMA
SECONDARY EMISSION