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The ion species fractions H+, H(2)+ and H(3)+ in the extracted beam of an ion source for neutral beam injection are determined. Optical measurements are obtained from a grating spectrometer using Dopplershifted H (alpha) light of the extracted beam and are compared to measurements with a magnetic spectrometer at the end of the beam line. The plasma source is a bucket source (modified JET-PINI) with a multiple magnetic field in checkerboard arrangement. The measurements were performed on the multimegawatt beam line of the IPP NI-test facility at KFA Jülich. The species fractions obtained for beams at 50 kV, 85 A, 4.25 MW are 63.8 : 24.5 : 11.7% (H+ : H(2)+ : H(3)+). Measurements over the beam pulse length of 2.6 sec show no significant variation of the extracted species mix with pulse length.

Additional information

Authors: BAECHLER M, Kernforschungsanlage Jülich GmbH (DE);UHLEMANN R, Kernforschungsanlage Jülich GmbH (DE);RUSBUELDT D, Kernforschungsanlage Jülich GmbH (DE)
Bibliographic Reference: Report: Jül-Spez-497 DE (1989)
Availability: Available from Zentralbibliothek der Kernforschungsanlage Jülich GmbH, Postfach 19 13, 5170 Jülich (DE)
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