HE-2+-H COLLISIONS - EXPERIMENTAL CHARGE-EXCHANGE CROSS-SECTIONS AND THEIR RELEVANCE FOR ALPHA-PARTICLE DIAGNOSTICS AT JET

GJ FRIELING*, R HOEKSTRA, R MORGENSTERN, FJ DEHEER

*Corresponding author for this work

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Abstract

We have determined absolute cross sections for electron capture into the quasi-degenerate 4l states of He+ produced in collisions of He2+ on atomic hydrogen. The cross sections have been deduced by deconvoluting spatial HeII(n = 4 --> n = 3) emission profiles. The measurements have been performed in the impact energy range of 2 - 130 keV/amu. The results are compared with theory. In addition we discuss the relevance of these cross sections to alpha-particle diagnostics in fusion plasmas. At the JET tokamak the HeII(n = 4 --> n = 3) emission can be used to determine related quantities like ion temperature, plasma rotation and local alpha-particle densities.

Original languageEnglish
Pages (from-to)S163-S164
Number of pages2
JournalZeitschrift für Physik. D: Atoms Molecules and Clusters
Volume21
Publication statusPublished - 1991
Event5TH INTERNATIONAL CONF ON THE ATOMIC PHYSICS OF HIGHLY CHARGED IONS - , Germany
Duration: 10-Sep-199014-Sep-1990

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