Enhancement of H[sup [minus]] production in an rf-driven multicusp source

Journal Article · Thu Apr 01 04:00:00 EST 1993 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1144152· OSTI ID:6701677

Leung, K N; Bachman, D A; McDonald, D S ^[1]

---

1. 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

Related Subjects

661220* -- Particle Beam Production & Handling
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