Influence of a biased beam dump on H/sup /minus// beam neutralization measurements with a four-grid energy analyzer
A four-grid energy analyzer (FGA) diagnostic has been developed for the study of H/sup /minus// beam space-charge compensation, and first measurements have been reported previously. Biased beam-dump measurements were undertaken to clarify the origin of electron currents measured in the FGA because they far exceeded predictions based on H/sup /minus// beam ionization and stripping processes. This experiment partially explains the anomalously large radial electron current. The FGA observations for beam-dump bias <0 suggest electron ionization of the background gas is an additional mechanism for producing positive ions, where the electron kinetic energy is derived form the beam-dump voltage. 6 refs., 4 figs.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- DOE Contract Number:
- W-7405-ENG-36; AC03-76SF00098
- OSTI ID:
- 6037901
- Report Number(s):
- LA-UR-89-2071; CONF-890703-9; ON: DE89014299
- Resource Relation:
- Conference: International conference on ion sources, Berkeley, CA, USA, 9 Jul 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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