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Surface collector probes were applied at TEXTOR for the investigation of silicon fluxes in the scrape-off layer during the first silicon-assisted (silane puffing, siliconisation) operation of a tokamak. The exposed graphite samples were examined by surface analysis techniques, including Auger electron and Rutherford backscattering spectroscopies, nuclear reaction analysis and ultra-high resolution microscopies. The most important findings are concerned with: (i) the relation between silicon to carbon and silicon to oxygen in the deposits; (ii) the change in radial profiles of Si, B and D fluxes during consecutive stages of the silicon-assisted operation, and the retention of the deuterium in the Si containing co-deposited layers. The influence of plasma density on the fluxes is considered and gettering of oxygen by silicon is also addressed. Comparison is also made with the results of VUV spectroscopy signals of silicon and oxygen impurities in the plasma.

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Authors: RUBEL M ET AL., Royal Institute of Technology, Stockholm (SE);WIENHOLD P ET AL., Forschungszentrum Jülich GmbH (KFA) (DE);ALMQVIST N, Luleà University of Technology (SE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vols. 220-222 (1995) pp. 536-540
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