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  • Spectroscopic measurement of the species composition and the beam divergence of hydrogen and deuterium beams of the ASDEX NI-beamline and HF-source


A Doppler-shift spectroscopy system has been employed on the ASDEX neutral injection beamline to measure the species composition and beam divergence during injection. The optical diagnostic system consists of a Czerny-Turner spectrometer with a linear photodiode camera, a camera controller and an AT-PC for data storage and analysis. The measurements have been made using a line of sight into the neutraliser. Each of the eight neutralisers can be connected by an optical fibre with the spectrometer to resolve the H(alpha)-light of the three velocity components of the beam. The data from the eight sources for hydrogen and deuterium injection confirm the known dependence on the extraction current for this type of periplasmatron source. The beam divergence was also determined from the Doppler-shifted H(alpha)-spectrum. A comparison with calorimetric measurements shows a good agreement. Following the measurements at the ASDEX neutral injection beamline, the optical diagnostic system was moved to the testbed of the HF-source. The optical species composition data of the HF-source confirmed the high proton yield of about 85% for source parameters of 50 kV and 80 A.

Additional information

Authors: BILAU FAUST R, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE)
Bibliographic Reference: Report: IPP IV/245 DE (1991) 58 pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 8046 Garching bei München (DE)
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