Enhancement of H[sup [minus]] production in an rf-driven multicusp source
- Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)
An rf-driven multicusp source has been operated in pulsed mode to generate H[sup [minus]] ions that are formed by volume processes. A total H[sup [minus]] 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[sup [minus]] beam current by introducing a small quantity of cesium vapor into the source chamber. It is found that the H[sup [minus]] 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.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6701677
- Journal Information:
- Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 64:4; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700380 -- Elementary & Classical Processes in Plasmas-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANIONS
BEAMS
CESIUM IONS
CHARGED PARTICLES
HYDROGEN IONS
HYDROGEN IONS 1 MINUS
ION BEAMS
ION SOURCES
IONS
LAWRENCE BERKELEY LABORATORY
NATIONAL ORGANIZATIONS
OPERATION
Ta
Targets-- (1992-)
US AEC
US DOE
US ERDA
US ORGANIZATIONS