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Abstract

Light impurity radiation from the TCV tokamak is permanently monitored using a 4-channel ultrasoft X-ray (USX) monochromator based on multilayer mirrors, allowing low-resolution measurements in the range 200-850 eV. The strongest lines accessible to the instrument are responsible for about 2/3 of the total radiated power of helium-like and hydrogen-like ionization stages of the impurities boron, carbon, nitrogen and oxygen. The instrument can provide a direct measurement of radiation losses from H-like and He-like light impurities. USX measurements and absolute emissivities from soft X-ray tomography are used together with the IONEQ code to determine impurity levels. Total plasma radiation is obtained from 3 16-channel bolometric cameras with nearly horizontal viewing lines.

Additional information

Authors: WEISEN H ET AL, Ecole Polytechnique Fédérale de Lausanne, Centre de Recherches en Physique des Plasmas (CH)
Bibliographic Reference: Article: Proceedings of the 23rd European Physical Society Conference on Controlled Fusion and Plasma Physics, Kiev (UA), June 24-28, 1996, pp. 111-114
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