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Methods of measuring the relative plasma composition by active charge exchange

2 methods of measuring the hydrogenic composition of a plasma with an active diagnostic beam have been investigated: evaluation at equal energies of the neutrals leaving the plasma and at equal velocities. Evaluation at equal velocity has the advantage that the plasma composition, particle penetration and stripping efficiency of the analyser do not enter the evaluation. The only plasma parameter that has to be known is the plasma temperature. If measurement at 2 different velocities is possible, the temperature can also be evaluated from the corresponding 4 fluxes without any further knowledge of plasma or beam parameters. The circumstances under which evaluation of the plasma composition for non-Maxwellian distribution functions is possible have been studied. As the halo effect may be the main source of error, the application of a helium beam may reduce this problem considerably.

Reported by

Max-Planck-Institut fuer Plasmaphysik
Boltzmannstrasse 2
85748 Garching bei Muenchen
Germany
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