Observations of low emittance-neutralized alkali ion beams from a large-area multistage injector

Journal Article · Mon Jun 15 04:00:00 EDT 1981 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.92243· OSTI ID:6359873

Phelps, D A; Wharton, C B

Experiments are reported on the operation of a three-stage accel-decel ion injector that is driven by a 500-kV--200-ns pulse line at a power density of > or approx. =100 kW/cm/sup 2/: previously unobserved for injectors with no simultaneous electron breakdown. Stable thermionic emission of sodium ions from an array of sixteen 3-mm x 10-cm scintered zeolite strips is demonstrated. Observations of over 500 mA/cm/sup 2/ beams are noted and attributed to uniform space-charge--limited extraction in the first stage and 3:1 electrostatic focusing in the second stage of the injector. After passing through the third stage, 500-V decel potential (to retard electron flow), 70% charge neutralization is achieved with a reflex triode electron source. A mean angular divergence of less than 5 mrad is deduced from profile data of the sodium ion beam and reported.

• Research Organization: Occidental Research Corporation, Irvine, California 92713
• OSTI ID: 6359873
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 38:12; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430302* -- Particle Accelerators-- Injection & Extraction Systems
ACCELERATION
ALKALI METALS
BEAM EMITTANCE
BEAM NEUTRALIZATION
BEAMS
CHARGED PARTICLES
DISTRIBUTION
ELEMENTS
EMISSION
FOCUSING
INORGANIC ION EXCHANGERS
ION BEAMS
ION EXCHANGE MATERIALS
IONS
MATERIALS
METALS
MINERALS
PULSES
SODIUM IONS
SPACE CHARGE
SPATIAL DISTRIBUTION
STABILITY
THERMIONIC EMISSION
ZEOLITES