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Graphite is an interesting material for plasma-facing components in fusion experiments, mainly because of its low atomic number and its excellent thermal properties. Nevertheless, it contains a large amount of gaseous impurities, which can be released by plasma-surface interaction and affect the purity of the deuterium-tritium plasma. To investigate the outgassing behaviour of graphites, CFCs and doped C composites, a facility has been set up to perform outgassing tests on samples (dim. 2 x 2 x 0.5 cm), as a function of temperature in the range between 100 and 1600 C. The experimental apparatus, designed to work in UHV conditions, allows outgassing measurements by a quadrupole mass spectrometer (1-200 AMU), using two different methods. The test facility, the quadrupole calibration and preliminary quantitative outgassing measurements on SEP CARB N112 samples are described in this paper.

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Authors: ALESSANDRINI C, ENEA, Centro Ricerche Energia Frascati, Roma (IT);APICELLA M L, ENEA, Centro Ricerche Energia Frascati, Roma (IT);VERDINI L, ENEA, Centro Ricerche Energia Frascati, Roma (IT)
Bibliographic Reference: Paper presented: XII Congresso Nazionale sulla Scienza e Tecnologia del Vuoto, Bolzano (IT), March 23-26, 1993
Availability: Available from (1) as Paper EN 37490 ORA
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