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  • The development of a measuring system for determining the partial pressure of helium in the presence of deuterium and its application to conductance research in the TEXTOR pump limiter ALT-I


The first aim of this research, the detailed investigation of the interaction between the returning neutral gas with the inflowing plasma particles in the pump limiter inlet canal, led to the second aim, to develop a suitable measuring system which would allow the partial pressures of helium and deuterium to be measured simultaneously. The research has shown that the metal capillary cathode and the Penning gauge are suitable for the spectroscopic analysis of partial pressure. The conductance work carried out on the ALT-I pump limiter shows a definite fall in conductance levels for the neutral gas returning from the pump limiter, as soon as the limiter head is exposed to the plasma. The possible causes for this reduction can be found in the processes which take place between the inflowing plasma particles and the neutral particles flowing in the opposite direction in the pump limiter inlet canal. This spectroscopic system has been installed in two pump canals of the ALT-II pump limiter and the ion-backscattering spectrometer is to follow. The objective of future investigations is to determine backflow conductance and to examine the pump limiter efficiency with regard to helium removal in more detail.

Additional information

Authors: HARDTKE A, Institut für Plasmaphysik der Kernforschungsanlage Jülich GmbH, Jülich (DE)
Bibliographic Reference: Report: Jül-2269 DE (1989)
Availability: Available from Zentralbibliothek der Forschungszentrum Jülich GmbH, Postfach 1913, 5170 Jülich (DE)
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