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Helium removal experiments are an important part of the pump limiter investigations of the advanced limiter test (ALT-II) device on the TEXTOR tokamak. The neutral helium gas has to be detected in a majority of deuterium molecules. As both masses are very close together and strong stray fields at the place of the helium detection are present, alternative methods for the detection of helium in a strong deuterium background have been developed. Limitations in the penning discharge operation have been overcome by using an electron cyclotron resonance (ECR) discharge. A 2.45 GHz ECR-ion source which has a single solenoid and a SmCo(5) multipole was applied. This ion source produces beams of light ions. Results of the measurements are presented and observations are discussed.

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Authors: MANK G, Forschungszentrum Jülich GmbH (KFA) (DE);FINKEN K H, Forschungszentrum Jülich GmbH (KFA) (DE);BEUSCHER H, Forschungszentrum Jülich GmbH (KFA) (DE);BROSDA B, Ruhr-Universität Bochum, Institut für Experimentalphysik V (DE)
Bibliographic Reference: Article: 21st International Conference on Phenomena in Ionized Gases, Bochum (DE) : Proceedings, Vol. III (1993) pp. 444-447
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