Poisoning studies of an osmium-coated dispenser cathode

Journal Article · Sun Jul 01 04:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347132· OSTI ID:6874637

Nexsen, W E; Turner, W C ^[1]

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1. Lawrence Livermore National Laboratory, Livermore, California 94551 (US)

The results of our studies on the reduction of the emission current from an osmium-alloy-coated dispenser cathode (derivative of the {ital M} cathode) due to exposure to various gases or vapors are reported. The primary interest of these studies is poisoning by chemical agents that might be encountered in the vacuum system of an induction linear accelerator. Of the constituents normally found in a tight unbaked vacuum chamber, the cathode is most sensitive to partial pressures of water vapor. Of the vapors studied which might be encountered in an induction accelerator, Freon was the most virulent poison.

• OSTI ID: 6874637
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:1; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430301* -- Particle Accelerators-- Ion Sources
ACCELERATORS
CATHODES
COATINGS
CURRENTS
ELECTRIC CURRENTS
ELECTRODES
ELEMENTS
EMISSION
FLUIDS
GASES
LINEAR ACCELERATORS
METALS
OSMIUM
PLATINUM METALS
POISONING
TRANSITION ELEMENTS
VACUUM SYSTEMS