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The possibility of applying glow discharge in H(2) for the conditioning of the FTU vacuum chamber has been analysed on a 1:1 scale toroidal sector by using the same operating conditions as foreseen for the machine. The discharge was maintained for six hours in the chamber, with the temperature of the walls at 150 C. The partial pressures at the end of the cleaning run were compared with those obtained using only thermal outgassing at the same temperature. A reduction of about a factor of two in the H(2)O and CO(2) partial pressures was observed, related to an improved cleanliness of the surface. The high temperature during the glow discharge cleaning not only increases the efficiency of the discharge, but is also an efficient tool for removing impurities from the hidden regions, defined by the thermal shields that cover all the vacuum vessel walls, which are not directly exposed to the glow discharge.

Additional information

Authors: CIOTTI M, 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);FERRO C, ENEA, Centro Ricerche Energia Frascati, Roma (IT)
Bibliographic Reference: Report: RT/NUCL/90/28 EN (1990) 20 pp.
Availability: Available from Servizio Studi e Documentazione, ENEA, Centro Ricerche Energia Frascati, C.P. 65-00044 Frascati, Roma (IT)
Record Number: 199210220 / Last updated on: 1994-12-02
Original language: en
Available languages: en
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