Electron-beam enhancement of ion charge state fractions in the metal-vaporvacuum-arc ion source

Citation
A. Bugaev et al., Electron-beam enhancement of ion charge state fractions in the metal-vaporvacuum-arc ion source, APPL PHYS L, 79(7), 2001, pp. 919-921
Citations number
12
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
79
Issue
7
Year of publication
2001
Pages
919 - 921
Database
ISI
SICI code
0003-6951(20010813)79:7<919:EEOICS>2.0.ZU;2-J
Abstract
We report demonstrations of ion charge-state enhancement for an electron-be am metal-vapor vacuum-arc (E-MEVVA) ion source. Results with a lead cathode yielded a maximum ion charge state of Pb7+, which implies an ionization po tential of at least 130 eV. Electron current densities j=70 A/cm(2) and ion ization times tau congruent to 100 mus produced j tau =9.2x10(-3) C/cm(2) ( 5.8x10(16) electrons/cm(2)). Standard analysis for these conditions indicat es-somewhat surprisingly-that successive single (stepwise) ionization accou nts for the present observations, even though the charge states are substan tially higher than most previous results with MEVVA-based ion sources. (C) 2001 American Institute of Physics.