Plasma discharge current--beam current relation for different gases in large-volume magnetic multipole ion sources
- Institut fuer Plasmaphysik, Forschungszentrum Juelich GmbH, Association EURATOM-KFA P.O.B. 1913, D-52425 Juelich (Germany)
Production of a certain extracted particle beam current requires for different gases different discharge currents in the ion source plasma generated by an arc discharge. Experimental data of hydrogen, deuterium, helium-3, and helium-4 particle beams extracted from large-volume ion sources with permanent magnet multipole confinement show that higher arc currents are required for the particles of higher atomic mass. These differences can be understood by considering the particle loss mechanisms in the ion source plasma. The differences in plasma leakage can be described by the particle loss area in the magnetic multipole cusp field. Such loss area is higher for the particles with higher mass. The size of loss channels is found to be proportional to the ion Larmor radius. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- OSTI ID:
- 165294
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 2; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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