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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.

Additional information

Authors: UHLEMANN R, Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Physics of Plasmas, Vol. 2 (1995) No. 6, pp. 2141-2146
Record Number: 199510886 / Last updated on: 1995-08-10
Original language: en
Available languages: en