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Recent spectroscopic measurements of n-alpha transitions, emitted through charge-exchange between impurity ions and the injected neutral hydrogen beam of TEXTOR, are discussed. Derivation of radial ion temperatures from line widths requires careful consideration of the Zeeman effect, as well as the processes of l-mixing and diffusion. Since the observation direction was roughly antiparallel to the toroidal magnetic field, the experiment provided data complementary to those from lithium-beam-CXS. Profile measurements were performed with a high-aperture 3/4 m monochromator containing a 135 x 165 mm plane grating in Littrow mounting, with an achromatic lens of 125 mm diameter as collimator. Spectral scans were made in the second order with high dispersion, the sigma (+/-) components being the major contributors to the lines, with weak additional pi components. The optical arrangement is shown. Both wavelength and radial scans were run simultaneously, with adequate signal reproducibility.

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Authors: HEY J D ET AL., Forschungszentrum Jülich GmbH (KFA) (DE)
Bibliographic Reference: Article: Proceedings of the 20th European Conference on Controlled Fusion and Plasma Physics, Vol. III (1993) pp. 1111-1114
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