Enhancement of H− production in an rf‐driven multicusp source

Autor:	Ka-Ngo Leung, D. A. Bachman, D. S. McDonald
Rok vydání:	1993
Předmět:	Materials science Aperture business.industry chemistry.chemical_element Ion source Ion Volume (thermodynamics) chemistry Caesium Deposition (phase transition) Optoelectronics Current (fluid) Atomic physics business Instrumentation Beam (structure)
Zdroj:	Review of Scientific Instruments. 64:970-973
ISSN:	1089-7623 0034-6748
DOI:	10.1063/1.1144152
Popis:	An rf‐driven multicusp source has been operated in pulsed mode to generate H− ions that are formed by volume processes. A total H− current of approximately 40 mA has been extracted from a 5.6‐mm‐diam aperture with rf input power higher than 50 kW. Attempts have been made to enhance the H− beam current by introducing a small quantity of cesium vapor into the source chamber. It is found that the H− output current can be increased by a factor larger than 3 if some cesium is applied in the collar around the exit aperture. Electron current can be reduced by cesium deposition on the chamber walls. A simple cesium delivery system fabricated from small dispensers has been operated very successfully with the clean rf induction discharge.
Databáze:	OpenAIRE
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